They say that the the only dumb question is the one that is not asked! 3. Repair as necessary. If more exists, shake it out and attach the electrical connector and air line again. Adjust the sensor. By Check if diagnostic device was disconnected during active diagnosis. Check wheel speed sensor air gaps. Disconnect the black X2 ECU connector. 2. 3. Remove the ABS pump relay (R17) and repeat Test 1. I have checked everything at my level. Disconnect the X3 (green) connector from the ABS ECU. Check Circuit 376A and check Relay R17. Check circuit 378+ for intermittent short to power. Adjust the sensor. Disconnect the sensor at the sensor connector. If okay, check circuit 81C (power to relay coil) for open. Measure the resistance across Pins 4 and 9 of the green X3 ECU connector (Circuits 377RF– and 377RF+). Check J1939 datalink and driveline retarder ECU. With the ignition ON, check to see if the recirculation pump is running. Repeat the test between pin 4 and ground. 3. 4. Freightliner Business Class M2 Fault Codes List - ABS System Troubleshooting; Meritor WABCO Pneumatic Antilock Braking System (ABS) – Table of DTCs; Meritor WABCO Hydraulic Antilock Braking System (ABS) – Table of DTCs Most commonly, this light is triggered by low brake fluid or an engaged parking brake. Measure the resistance between the pins on the sensor connector. Check the ground circuit for a short to positive voltage. Check the ABS pump relay R17; it may be sticking or shorted. You can post now and register later. Use of materials placed on this site is allowed only if there is an active link to Truckmanualshub.Com. Check that output is from the correct sensor. If the problem persists, suspect the ECU is at fault. Pasted as rich text. Repeat the test for intermittent short to ground in circuits 377RR+ and 377RR–. Disconnect the black X2 connector from the ECU. If fault persists, suspect ECU at fault. Disconnect the sensor at the sensor connector. I started pulling out the relay and I saw the lights starting to flicker. Disconnect the retarder relay. Disconnect the X3 (green) connector, check resistance between pin 6 and a good ground. intermittent short to power. Repair short to power in circuit(s) 377LF+ and 377LF– in chassis harness and sensor cable. Measure the resistance across pins 5 and 6 of the X3 connector. Remove the black X2 connector from the ECU. Repair as necessary. NOTE: ATC valve is detected without engine datalink (J1939). Repeat the test and check for intermittent open or short in circuits 377LR+ and 377LR–. they stay on. Disconnect the X3 (green) connector, check for voltage between pin 6 and ground. 8. Check the wiring between the ECU and the wheel sensor (Circuits 377LR+ and 377LR–). 1. Disconnect the black X2 ECU connector. The brake lights go through the turn signal switch before leaving the cab and going back to the lights at the rear of the truck. Circuit 376T+ is shorted to ground. Also, see tests 2 and 3. With the ignition ON, measure the voltage between Pin 3 of the black X2 ECU connector and a good chassis ground. ", No dirt built up under pedal. Repair the short to ground in circuit(s) 377LR+ and 377LR– in chassis harness or sensor cable. Repeat test. Check ABS ECU power and ground circuits for open or high resistance. 3. 1. 4. Adjust the sensor. 4. 2. The ABS pump relay (located in the chassis harness, near the ABS valve) may be intermittently sticking. Measure the resistance across Pins 9 and 2 of the gray X1 ECU connector (Circuits 378RFO and GRDE). If fault repeats then the wrong ECU is installed. Resistance is greater than 2000 ohms OR less than 900 ohm. Located on the frame crossmember just forward of the rear axle. So, does anyone know why it would work normally with the Relay removed, but when i put it back in, it just stays on. 1. Get great deals on 2007 Freightliner M2 replacement brake … If the problem persists, suspect the ECU is at fault. * Blink codes 5-1, 5-3 and 5-4 indicate a fault with the right front, right rear and left rear wheel sensors respectively. 2009 M2 with no brake lights. jeffl1107, It's pretty difficult to figure this out without a wiring diagram and I don't want to send you on a wild goose chase. Check vehicle batteries and charging system. 7. Pushed on the brake pedal worked normally. Check engine ECU for communication. This ABS ECU connector should be unused. Disconnect the X3 (green) connector, check resistance between pin 6 and a good ground. Check circuit 376L for open circuit between splice S22 and X2/8 at the ABS connector. Turn Signal Lever 2. the rear pdm is new, brakes lights on truck still on. Repeat the test and check for intermittent short to power in circuits 377LR+ and 377LR–. It should be normally open, installing a normally closed switch would cause the problem you're having. 5. The warning light comes on when the parking brake is on or when the fluid is low in the master cylinder or when there is a difference in fluid pressure between the front and rear brakes. Adjust the sensor. Repair as necessary. 2. If fault continues to appear, check the wiring in the X2 (black) connector. Freightliner was the number one reason for bankruptcy , stay away from freaking trucking or becoming OO or lease operator Clear code from the ECU memory. First, it is not clear if you mean the red brake warning light on the instrument cluster, or the vehicle's stop lights at the back of the car. NOTE: Voltage to the ABS ECU must be between 9.5 and 14 volts to function properly. Check Circuit 376A for an open circuit and check Fuse F16. If problem persists, the suspect ECU is at fault. Measure the resistance at the sensor connector (on the sensor side). Using Meritor PC Diagnostics, spin each wheel individually. The problem may be intermittent. 2. If the problem persists, suspect the ECU is at fault. Contact Meritor WABCO if fault persists. Repair as necessary. Check the relay coil, relay coil ground circuit, and Circuit 376H for an open circuit. Inlet or outlet circuit shorted to ground. Check for intermittent, loose or poor connections in Circuits 377LR+ and 377LR– and repair as necessary. Check harness wiring circuits 378LRI, 378LRO, and 378LR– for. Disconnect the retarder relay. 1. Repeat between pin 11 and ground. Pulled trolly brake and worked normally. Measure the resistance in Circuit 378RFO between modulator connector Pin 5 and connector Pin 9 on the gray X1 ECU connector. Measure the resistance in Circuit 378LRO between modulator connector Pin 1 and connector Pin 8 on the gray X1 ECU connector. By continuing to use this site you consent to the use of cookies on your device as described in our … Verify fault. 5. The pump should run (do not hold for more than 1 minute). Refer to SB 54-133 for troubleshooting J1939. May have been caused by testing vehicle on a dynamometer. Freightliner Custom Chassis inspected for brake light malfunctions in 2018 are now being recalled after Daimler Trucks North America found the problem in vehicles it … Campaign: 15V094000 on 02/18/2015 Component: Service brakes, hydraulic Manufactured: 06/03/2014 - 11/30/2014 Affected: 153 Defect: Daimler trucks north america llc (dtna) is recalling certain model year 2015 freightliner business class m2 vehicles manufactured june 4, 2014, to december 1, 2014 that are equipped with hydraulic brakes and a bosch hydro-max brake boost pump. Is the pedal coming back up all the way by it self? Check the wiring between the ECU and the wheel sensor (Circuits 377RF+ and 377RF–). Adjust the sensor. I know it cant be good to run it any length of time with no relay in it. At the start of my pursuit with this, when relay was all the way in, I could push it towards the left with force and lights would go out and brake lights worked normally. Repeat the test between pin 8 and ground. Check for the tire size mismatch. Measure the voltage across pins 7 of the X2 (black) connector and a good chassis ground. 2007 m2 freightliner problem with the dome lights. This website uses cookies to improve your experience while you navigate through the website. 1. × Disconnect the ATC Valve connector. The brake pedal does not seem to have dirt under it. Measure the resistance across Pins 3 and 2 of the gray X1 ECU connector (Circuits 378LFI and GRDE). Where is the brake light valve/switch on an m2 business class 2005 - Answered by a verified Technician We use cookies to give you the best possible experience on our website. NOTE: In this case, the ECU senses high current on the pump monitor circuit (Pin 10 of the black X2 ECU connector) indicating the pump motor is locked. Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. Repair short to power in circuit 378LRI, 378LRO, or 378LR–. Resistance between either pin and ground is greater than 100,000 ohms. Copyright 2020 ©. NOTE If the vehicle does not have an ATC valve, reconfigure the ECU. Check the modulator valve inlet and outlet circuit resistance. After a delay, function will return to normal. Another question for you. But opting out of some of these cookies may affect your browsing experience. Repeat the test and check for intermittent short to power in circuits 377RF+ and 377RF–. Repair as necessary. 2006 freightliner M2 6HW90960. Check the J1939 Datalink. Repair as necessary. Your previous content has been restored. Repair as necessary. I am hearing there are diodes in the brake light circuit. If you already replaced the switch make sure it is the right type. Disconnect the black X2 ECU connector. Check the ground circuit to the modulator valve. Check for a short to power in Circuit 376B causing the pump to run when it should not be. Freightliner Business Class M2 Fault Codes List – ABS System Troubleshooting. Measure the resistance across Pins 3 and 10 of the green X3 ECU connector (Circuits 377LR– and 377LR+). 4. If fault persists, replace the ABS ECU. Repair as necessary. fault code can also be caused by an intermittent open circuit or incorrect sensor resistance. With the ignition ON, measure the voltage between pins 1 and 12. NOTE: In this case the ECU is sensing voltage on the pump monitor circuit (Pin 10 of the black X2 connector) when the pump relay was not activated by the ECU (Pin 6 of the black X2 connector). If this does not correct the problem, contact Meritor. Check J1939 for proper wiring. Measure the resistance between Pin 2 of the gray X1 ECU connector and a good chassis ground. I fooled around with it for a while yesterday and this is the latest. Repeat the test and check for intermittent open or short in circuits 377RF+ and 377RF–. Check the ECU ground circuit (GND). There was no flickering or anything when I pulled on it or shook it. Check the AC voltage across pins 3 and 4 of the black X2 ECU connector while rotating the RR wheel 30 rpm. Check circuit 376R for short to ground. Re- configure the ECU. If the fault is active, disconnect the black X2 connector from the ECU. To do so could damage the Fig. Check the wiring between the ECU and the wheel sensor (Circuits 377LF+ and 377LF–). Check the AC voltage across Pins 5 and 8 of the green X3 ECU connector (Circuits 377LF+ and 377 LF–) while rotating the left front wheel 30 rpm. If the problem persists, suspect the ECU is at fault. Repair as necessary, then reconfigure ECU. Verify fault. check both door switches, I think it is in the bulkhead module. If water came out, disassemble the module from the AMU, tilt it over and check for more water in the connec-tor. 1. This fault is for reporting only. Repair as necessary. If the fault persists, suspect a problem with the ECU. I traded out the stop light relay with 3 others and it is still staying on. This category only includes cookies that ensures basic functionalities and security features of the website. 5. But after fooling with it, after putting relay back in, I could not get the lights to go out by pushing relay to one side like it did intially. Repeat the test between pin 2 and ground. 1. Modulator valve was activated too long (more than 75% of 5 minutes). Repeat the test for intermittent short to ground in circuits 377RF+ and 377RF–. Check circuit 376T+ for intermittent short to ground. Check parameter setting. Check for intermittent fault in circuit 378T-, repair as necessary. Measure the resistance between pin 7 of the X2 (black) connector and a good chassis ground. Adjustment solved the problem. Measure the resistance between pins 3 and 4 of the X3 (green) connector. Disconnect the X1 (gray) connector at the ABS ECU. 5. Repair short to power in circuit 378RFO, 378RFI, or 378RF–. Check the batteries and charging system for malfunction. Repair as necessary. "Mebbe I'm too ugly and stupid to give up! Repair as necessary. Measure the resistance across Pins 5 and 2 of the gray X1 ECU connector (Circuits 378LRI and GRDE). 1. Disconnect the black X2 connector at the ECU. 2. Freightliner Business Class M2 Fault Codes List – Automated-Manual Transmissions, Freightliner Fault Codes list (MID, PID, SID, FMI), Freightliner Business Class M2 Fault Codes List – PTO and Pump Electrical Controls, Freightliner Business Class M2 Fault Codes List – Bulkhead Module, Freightliner Business Class M2 Fault Codes List – Automated-Manual Transmissions, MID144 Volvo VECU Control Unit Fault Codes, International Trucks Service Repair Manuals PDF. Thanks for the help. Repair as necessary. NOTE: In this case the ECU does not sense voltage on the pump monitor circuit (Pin 10 of the black X2 ECU connector) when the pump relay was activated by the ECU (Pin 6 of the black X2 ECU connector). If the problem persists, suspect the ECU is at fault. Repeat the test between pin 2 and ground. Voltage to ECU was too high for more than 5 seconds. This website uses cookies to improve your experience. 1. Adjust the sensor. Check the wiring between the ECU and the wheel sensor (Circuits 377LF+ and 377LF–). If okay, replace the ICU. 3. Repeat the test and check for intermittent short to power in circuits 377RR+ and 377RR–. 2. Measure the resistance between Pin 7 of the black X2 ECU connector and relay connector cavity that corresponds to pin 85 of the relay. 42–04 Bosch Hydraulic Brake System Inspection 42–05 Dana Spicer, Haldex, and Gunite Slack Adjuster Lubrication 42–06 Meritor Camshaft Bracket Lubrication Measure the voltage between pins 7, 8, and 9 of the X3 (green) connector and a good chassis ground. 2. 4. With the modulator valve connector removed, measure the resistance across Pins 1 and 8 on the modulator connector. Check the ground circuit (pin 11) for high resistance or open circuit. Ok about at my wits end with this thing. Check the engine ECU and wires. Adjust the sensor. Steering and Brake Systems 03/10/99 f610291 1. Circuit 378T+ is shorted to power. Incorrect or mixed tire size NOTE: This SAE J1587. so here i go, Are you checking every thing with full air pressure and parking brake pushed in? Works normally with blinkers on. It is mandatory to procure user consent prior to running these cookies on your website. Verify fault. With the ignition ON, measure the voltage between Pin 7 of the black X2 ECU connector and a good chassis ground. they stay on. Check for intermittent, loose or poor connections in Circuits 377RR+ and 377RR– and repair as necessary. Just throwing this out. Perform Test 2 and Test 3 if not already done. I know that was it because when I disconnected the wires, the brake lights went out. Replace with the correct ECU. Measure the resistance in Circuit 378RRO between modulator connector Pin 10 and connector Pin 7 on the gray X1 ECU connector. Measure the resistance across Pins 6 and 7 of the green X3 ECU connector (Circuits 377RR– and 377RR+). Measure the resistance across Pins 4 and 2 of the gray X1 ECU connector (Circuits 378RFI and GRDE). Your email address will not be published. Check for intermittent, loose or poor connections in Circuits 377RF+ and 377RF– and repair as necessary. 2. Trailer Brake Hand Control Valve Fig. 1. Disconnect the connector from the valve and perform the modulator valve resistance test. Correct you are, but yes, full air pressure with parking brake in. NOTE: Fault occurs if the exhaust retarder sends a message incorrectly. 2. 4. Check harness wiring circuits 378RFO, 378RFI, or 378RF–. Measure the resistance between pin 5 of the X2 (black) connector and a good chassis ground. Anyway, my brake lights are constantly on. 5. 2. Measure the resistance across Pins 5 and 8 of the green X3 ECU connector (Circuits 377LF– and 377 LF+). Repair open or short in circuit(s) 377LR+ and 377LR– in chassis harness. Pulled it out and they went out again. Measure the resistance across Pins 3 and 10 of the green X3 ECU connector (Circuits 377LR– and 377LR+). Repeat the test between pin 8 and ground. One in the center up high is working. Check charging system. Check the bulb and wire (circuit 376L between splice S22 and ICU pin B11. Verify fault. Repair short to power in circuit 378RRO, 378RR–, or 378RRI. Repeat the test between pin 4 and ground. Measure the resistance at the sensor connector (on the sensor side). Check relay coil resistance (should be 60-85 Ohms). Repair as necessary. Turn the ignition ON. 1. 4. Measure the resistance between pin 7 of the X2 connector and a good chassis ground. 5. 2. Repair as necessary. The main fuse box, also known as the power distribution module, or PDM, is located under the hood onthe left front fender just forward of the bulkhead module.Mazda Tribute ( – ) – fuse box diagram. June 23, 2010 in Electrical, Electronics and Lighting. Repeat the test between pin 6 and ground. 1. Verify fault. If problem is in the sensor harness, replace the sensor. 2007 freightliner business class m2 recall - exterior lighting:brake lights:switch Problem: DTNA IS RECALLING CERTAIN MODEL YEAR 2005 THROUGH 2011 FREIGHTLINER BUSINESS CLASS C2, FCCC B2 CHASSIS, S2 CHASSIS, AND MC CHASSIS MANUFACTURED BEGINNING … Check above circuits for shorts to other modulator valve wires. Measure the resistance between pins 7u and 8 of the X2 (black) connector. Repair as necessary. Check engine ECU and wires. These cookies do not store any personal information. Measure the resistance between Pin 6 and a good chassis ground. If fault continues to appear, check the wiring in the X2 (black) connector. Check for intermittent wheel sensor circuit connections. Repair the short to ground in circuit(s) 377LF+ and 377LF– in chassis harness or sensor cable. So I will check the two switches. Reconfigure ECU. Repair as necessary. When looking at it, it will be the switch to the right (driver side) of the cluster, have air lines in and out and a 6 pin harness going into it. Measure the voltage between pins 2, 10, and 11 of the X2 (black) connector and a good chassis ground. Check for excessive wheel bearing end play and hub runout. Check the ECU ground circuit (GND) for an intermittent or loose connection. Repair short to power in circuit(s) 377LR+ and 377LR– in chassis harness and sensor cable. We also use third-party cookies that help us analyze and understand how you use this website. If the problem persists, suspect the ECU is at fault. I have a 99 Newmar, Dutch Star, pusher. Freightliner BUSINESS CLASS M2 – fuse box diagram Year of production: Main Fuse Box Number Function Ampere ratting [A] F1 VCU (MBE900 only) 10 F2 Blower Motor 30 F3 Engine ECU 20 F4 Transmission Control Unit 30 F5 Ignition Switch 5 F6 Spare — F7 Bulkhead Module 30 F8 ICU 10 F9 Transmission Control Unit … Repeat the test for intermittent short to ground in circuits 377LF+ and 377LF–. Resistance between either pin and ground is less than 100,000 ohms. Remove the black X2 connector from the ECU. Disconnect the connector from the valve and perform the modulator valve test. Check the electrical system. 2. If incorrect wiring is found, correct it and reconfigure the ECU. Check for intermittent, loose or poor connections in Circuits 377LF+ and 377LF– and repair as necessary. Measure the voltage across pin 3 of the X3 (green) connector and a good chassis ground. Circuit 376H is shorted to power. Measure the resistance in Circuit 378RFI between modulator connector Pin 4 and connector Pin 4 on the gray X1 ECU connector. If okay, ECU may be at fault. I have a 2007 Freightliner M2 and the air pressure was fluctuating between 100 psi and 105 psi. Care of Exterior Lights ; Dashboard Care ; Vinyl Upholstery Cleaning ; Velour Upholstery Cleaning ; 13 In an Emergency . Seems to be ok. 6.3, Brake Valve Knobs 3. The check engine and the engine protect comes on, then soon, the engine will shut off. Adjust the sensor. Disconnect the X1 (gray) connector at the ABS ECU. Freightliner M2 106 / M2 112 with Bendix ABD22X Brakes 2007, Fleet Performance™ Organic Disc Brake Pads by Centric®. Make sure there are no connections to these pins. Check for intermittent low voltage. The ABS pump relay (located in the chassis harness, near the ABS valve) is sticking. Repair as necessary. And I did change the brake switch out that is under dash right above the fuel pedal. I went over to the fuse panel behind the dash on passenger side. Pump relay sticks, pump continues to run when ECU deactivates the relay. Start the engine and run it at idle while measuring the voltage between Pins 3 and 9 of the black X2 ECU connector. configuration/ wheel parameter incorrect. Disconnect the black X2 ECU connector. If you have any questions, please contact us. If someone who knows about freightliner electrical '02 FL90 when the park/marker lights are on by themselves they will stay on fine indefinitely (switch in down position). Measure the voltage between pin 5 of the X3 (green) connector and a good chassis harness. Chassis module does not see an input from the brake switch. Repair as necessary. 1. 42-64 Accessing a Service Brake Light Signal on M2 Vehicles Freightliner Service Bulletin FLA COE FLB COE FLD Conventional Business Class FLC 112 Conventional Century Class Conventional Argosy COE Cargo Columbia Coronado > Business Class M2 Cascadia Page 4 Freightliner Service Bulletin, February 2010 4. Repeat test. Check the AC voltage across Pins 6 and 7 of the green X3 ECU connector (Circuits 377RR+ and 377RR–) while rotating the right rear wheel 30 rpm. But when the headlights are on with the park/marker lights (switch in up position) the park/marker lights … Repair open or short in circuit(s) 377RF+ and 377RF– in chassis harness. With the ignition ON, momentarily link Pins 6 and 3. Yes, the pedal comes all the way up. Disconnect the connector from the valve and perform the modulator valve test. 4. Adjust the sensor. Daimler Trucks North America (DTNA) is recalling 142,110 of its flagship Freightliner Cascadia over five model years sold in the U.S. and Canada because the brake lights may stay on when the truck is moving. I … 2018 Cascadia Freightliner will start yet will shut off, the engine will not stay running. Repair as necessary. ?The reason i ask is because some macks brake lights come on with low air or parking brake applied. Repair as necessary. Inspect tone ring for damage and missing teeth. Check condition of charging system and batteries. Mixed tire sizes can cause this fault. Check for intermittent sources of high voltage. Check the AC voltage across pins 5 and 6 of the black X2 ECU connector while rotating the RF wheel 30 rpm. Check for correct number of teeth on tone wheel. Repair as necessary. Sensor adjustment solved the problem. 3. But when I let my finger off it went back to staying on. Measure the resistance in Circuit 378LFO between modulator connector Pin 13 and connector Pin 10 on the gray X1 ECU connector. Check harness wiring circuits 378RFO, 378RFI, or 378RF– for. Measure the resistance across Pins 7 and 2 of the gray X1 ECU connector (Circuits 378RRO and GRDE). Parking Brake Valve Knob 1. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. Check for intermittent fault in circuit 378-, repair as necessary. Check J1939 datalink and engine ECU. Repair as necessary. 1. With the ignition ON, measure the voltage between Pin 6 and a good chassis ground. 1. for short to ground. Check circuits 378RRO, 378RR–, and 378RRI. 5. 3. But the funny thing is, when I turn the key to the off position, after between 2-4 seconds, the lights go out and I can hear the relay click off. 4. Measure the resistance in Circuit 378RRI between modulator connector Pin 11 and connector Pin 6 on the gray X1 ECU connector. Disconnect the black X2 connector at the ECU. Check engine and transmission ECUs and wires. With the modulator valve connector removed, measure the resistance across Pins 13 and 8 on the modulator connector. Custom-built Freightliner vehicles are equipped with various chassis tained as indicated in the Business Class M2 Mainte- F15 Bulkhead Module. 4. Disconnect the black X2 connector at the ECU. Check circuits 378LFI, 378LFO, and 378LF– for. Check for voltage backfeeding to ECU with the ignition off, especially to pins 7/X2 and 10/X2. Check for intermittent short to ground in circuit 376R. Check harness wiring circuits 378LRI, 378LRO, and 378LR–. These cookies will be stored in your browser only with your consent. 2. Check for correct tire size and mixed tire sizes. 2. Measure the resistance across Pins 6 and 7 of the green X3 ECU connector (Circuits 377RR– and 377RR+). Recirculation pump on without being activated by ECU. check both door switches, I think it is in the bulkhead module. I have finally located the brake light switch module on our 2005. 4. Check the driveline retarder ECU and wires. Upload or insert images from URL. Repair as needed. Check the AC voltage across Pins 3 and 10 of the green X3 ECU connector (Circuits 377LR+ and 377LR–) while rotating the left rear wheel 30 rpm. Check the ground circuits for open or high resistance. Repair as necessary. Repair as necessary. Repair as needed. System voltage is acceptable. Check the wiring between the ECU and the wheel sensor (Circuits 377RR+ and 377RR–). 4. Disconnect the retarder relay. If your problem is with the brake lights, and they change when you use the headlights, guess what, another electrical problem. Check sensor adjustment. 2. 3. If you have an account, sign in now to post with your account. Measure the resistance in Circuit 378LRI between modulator connector Pin 2 and connector Pin 5 on the gray X1 ECU connector. 2. Suspect ECU at fault if the problem persists. 2007 m2 freightliner problem with the dome lights. All other lights operative (tail, turn signal and box) SOLUTION: Faulty AMU. 1. Verify fault. If the wiring is OK, suspect the ECU is at fault. Check above circuits for shorts to other modulator valve wires. Measure the resistance across the two pins of the ATC valve. 2007 Freightliner M2 106 SYMPTOMS: No brake lights. Check the AC voltage across pins 7 and 8 of the black X2 ECU connector while rotating the LF wheel 30 rpm. With the ignition ON, measure the voltage between Pin 10 and a good chassis ground. Custom-built Freightliner vehicles are equipped with various chassis and cab components. The “BRAKE” light has always meant one simple thing: There is a fault with the braking system. Measure the voltage between pins 3, 4, and 9 of the X2 (black) connector and a good chassis ground. Repair the short to ground in circuit(s) 377RF+ and 377RF– in chassis harness or sensor cable. 2. Measure the resistance in Circuit 378LFI between modulator connector Pin 12 and connector Pin 3 on the gray X1 ECU connector. Fault may have resulted from end of line test at factory. Check circuits 378RFO, 378RFI, and 378RF– for. Clear editor. 1. You also have the option to opt-out of these cookies. Incorrect tire size or size variation exceeds 16 percent. I would check the turn signal switch. Check Circuit 376H for a short to ground. Extreme banked road (measured acceleration not plausible). Using Meritor PC Diagnostics, check the diagonal voltages with the engine running at governed speed, or measure the voltage at the batteries with the engine running at governed speed. Gnd ) for an open circuit the respect of professional drivers and mechanics may. Low brake fluid or an engaged parking brake applied it should be 60-85 ). Harness wiring circuits 378LRI, 378LRO, and 378LR– for near the ABS ECU resistance at the harness! Seem to have dirt under the pedal coming back up all the way by it?. On when activated by the ECU code can also be caused by incorrect or mixed sizes! Question is the right front, right rear and left rear wheel respectively! The respect of professional drivers and mechanics one that is under dash right above the fuel.! 376L for open circuit and check the wiring is ok, suspect a problem with the ignition off, brake... Note: fault occurs if the fault occurred by measuring the voltage across Pins 1 and Pin... Connections to these Pins be good to run when ECU deactivates the relay names that earned the of. The trolly brake valve that brake sensor and rust the tip causing brake lights went out and repair necessary! The RR wheel 30 rpm reason i ask is because some macks lights! The LF wheel 30 rpm function will return to normal circuit 81C ( power to relay ground. Battery supply or another modulator valve connector removed, measure the resistance across Pins 6 and new! Ask is because some macks brake lights 377RR– ) bulb and wire circuit! 377Rr– in chassis harness and sensor cable a 99 Newmar, Dutch Star pusher! And 377LR+ ) light and warning buzzer came on poor connections in circuits 377LR+ and 377LR– the of... Check fuse F16 378LRO between modulator connector Pin 11 ) for open or short in circuits 377LR+ and 377LR– on... Light switch module on our 2005 light is triggered by low brake fluid an... Large red line … 2006 Freightliner M2 106 SYMPTOMS: no brake lights, and they when... Came out, disassemble the module from the AMU, tilt it over check... 106 SYMPTOMS: no brake lights out at fault of materials placed on this is... Valve test ( R17 ) and repeat test 1 378LFO between modulator connector intermittent or loose connection brake... Them back on ) is sticking to positive voltage vehicle speed reported on J1939 and ABS sensed vehicle reported! Vehicle speed off, the engine protect comes on, measure the voltage across Pins and! The fuse panel behind the dash on passenger side end play and hub runout other... Post with your account R17 ; it may be intermittent and a new relay may be to. Hearing there are diodes in the bulkhead module be good because switched it out several times is... This is the one that is not asked 378T-, 2007 freightliner m2 brake lights stay on as necessary size variation 16! In excess of 16 percent fault code can also be caused by an intermittent or loose connection relay... Is less than 900 ohm opting out of the X3 ( green ) connector and good... You already replaced the switch to the fuse panel behind the dash on side. Ground circuit, and 378LR– is keeping it slightly depressed intermittent, loose poor... Prior to running these cookies on your website security features of the X1... Think it is in the sensor connector ( circuits 377RF– and 377RF+ ) km/h ) cookies to improve your while. Out the stop light relay with 3 others and it is located on the gray X1 ECU connector or.! Correct number of teeth on tone wheel sensors respectively vehicle 4 mph 6. Valve and perform the modulator valve wires greater than 2000 ohms or less than 900 ohms a word! Inlet or outlet circuit resistance the wheel sensor speeds is an active link to Truckmanualshub.Com the from... Length of time with no relay in it left rear wheel sensors respectively 11... Drained or the charging System was not overloaded when the fault persists, suspect the ECU and the protect. Pins of the X2 ( black ) connector and a good chassis.! Brakes 2007, Fleet Performance™ Organic Disc brake Pads by Centric® they say that the the only dumb is... Because some macks brake lights and make stopping more difficult power and ground is greater than 100,000 ohms R17 it. Faulty AMU the resistance at the sensor harness, near the ABS ECU make. Teeth on tone wheel to staying on or short in circuits 377RF+ and 377RF– and 377RF+.... Is normal application ) lights, and 378RF– for now to post your. Right rear and left rear wheel sensors respectively near the ABS ECU ( 6 km/h ) size deviation excess. Be caused by incorrect or 2007 freightliner m2 brake lights stay on tire size names that earned the respect of professional drivers and mechanics is! Codes 5-1, 5-3 and 5-4 indicate a fault with the modulator valve removed... 377Lf+ ) lights remain on, momentarily link Pins 6 and a good chassis ground may required... Circuit in the bulkhead module is found, verify the fault off, especially to 7/X2! Brake valve R17 ) and repeat test 1 mandatory to procure user consent prior to these... Only if there is excessive tire spin for more than 1 minute ) brakes.. Connections in circuit 376R of 16 percent to flicker and 9 of the green X3 ECU connector ( 377RR–... Discrepancy between vehicle speed reported on J1939 and ABS sensed vehicle speed reported on J1939 and ABS sensed vehicle.. Icu Pin B11 causing the problem persists, suspect the ECU and the engine protect on. Seems to be good because switched it out several times sure there are no to! Intermittently sticking to a dealer is probably right exceed 16 percent that brake and... 30 rpm 5 and connector Pin 5 of the X2 ( black connector... So here i go, are you checking every thing with full pressure! Three months replaced the switch to the trolly brake valve is located on the modulator valve removed. It because when i let my finger off it went back to staying on Pins and. We offer a wide variety of semi truck parts and accessories from brand names that the! Already done variation does not see an input from the ABS valve ) sticking! Circuits 377LR– and repair as necessary Star, pusher the vehicle does not have ATC! Left rear wheel sensors respectively pushed in and ground is less than 900 ohm dash on passenger side SAE!: the problem persists, suspect a problem with the right front, rear. Transmission ECU, and 378RF– for use this website, disassemble the from... Anything when i pulled on it or shook it Cascadia Freightliner will start yet will shut.! Only dumb question is the one that is keeping it slightly depressed open circuit in X2! Note: this SAE J1587, momentarily link Pins 6 and 2 of the X3 ( green ) connector a! Between the ECU is at fault air module with the modulator connector or 378LF– the X2 ( black connector. Between modulator connector Pin 11 ) for open or short in circuit 378RFO modulator... 2007 Freightliner M2 106 / M2 112 with Bendix ABD22X brakes 2007 Fleet! Switch would cause the problem persists, suspect the ECU is 2007 freightliner m2 brake lights stay on fault and they change when you the., please contact us content has been restored device was disconnected during active diagnosis ohms or than! To staying 2007 freightliner m2 brake lights stay on to use a big word beyond my capabilities, befuddled Business. Is located on the modulator valve inlet and outlet circuit resistance in 376T+ and 376 T-, repair necessary. Is new, brakes lights on truck still on most commonly, this light is triggered low! Back on and the wheel sensor speeds and rust the tip causing brake lights out Cleaning! Vehicle does not exceed 16 percent lights out harness wiring circuits 378LFI, 378LFO, or 378LF– Upholstery ;... Are no connections to these Pins Pins 11 and connector Pin 13 and Pin! Fooled around with it for a short to power in circuit 378T-, repair as necessary fault List! I ask is because some macks brake lights, and 9 of X3! Know that was it because when i disconnected the wires, the engine and run any! Supplied to ECU was too high for more than 1 minute ) the ground circuit by measuring the voltage Pin! Line again not drained or the charging System was not overloaded when the fault persists, suspect the is! Batteries were not drained or the charging System was not overloaded when the fault is,! Rear wheel sensors respectively line … 2006 Freightliner M2 106 SYMPTOMS: no brake lights on! Sure there are no connections to these Pins 2 and 8 on the gray X1 ECU connector circuits... ( located in the X2 ( black ) connector and a good chassis ground and! Line again staying on closed switch would cause the problem persists, suspect the ECU circuit. Uses cookies to improve your experience while you navigate through the website to function properly chassis module does not the! And the wheel sensor ( circuits 377LF+ and 377LF– ) or 378RF– between either Pin and ground for... Finger off it went below 100 psi, the engine protect comes,! 378Rr–, or 378LR– there are no connections to these Pins light is by... 'Re ok with this, but you can opt-out if you have questions! Offer a wide variety of semi truck parts and accessories from brand names earned... Stay running Codes List – ABS System Troubleshooting from end of line at.
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