2007 freightliner m2 brake lights stay on

Resistance is greater than 2000 ohms OR less than 900 ohms. ?The reason i ask is because some macks brake lights come on with low air or parking brake applied.   You cannot paste images directly. Anyway, my brake lights are constantly on. 6.3, Brake Valve Knobs 3. Pump relay sticks, pump continues to run when ECU deactivates the relay. Repair short to power in circuit 378RRO, 378RR–, or 378RRI. Repair as necessary. 6. This fault is for reporting only. If incorrect wiring is found, correct it and reconfigure the ECU. 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. Using the wheel sensor output screen in Meritor PC Diagnostics, spin the wheel or drive the vehicle and check for intermittent or erratic signal. If more exists, shake it out and attach the electrical connector and air line again. If the fault persists, suspect a problem with the ECU. 2. 3. Suspect ECU at fault if problem persists. 3. Went for a state inspection found I have two brake lights out. 2. 1. 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. Custom-built Freightliner vehicles are equipped with various chassis tained as indicated in the Business Class M2 Mainte- F15 Bulkhead Module. Custom-built Freightliner vehicles are equipped with various chassis and cab components. Circuit 378T- is shorted to power. 3. 4. 4. Check for the tire size mismatch. Required fields are marked *. Get great deals on 2007 Freightliner M2 replacement brake … Check sensor wiring and connectors for intermittent contact. Check the ECU ground circuit (GND) for an intermittent or loose connection. Check the AC voltage across pins 3 and 4 of the black X2 ECU connector while rotating the RR wheel 30 rpm. Copyright © Truckmanualshub.Com 2018-2020 | All Rights Reserved. If you have an account, sign in now to post with your account. Measure the resistance across Pins 5 and 2 of the gray X1 ECU connector (Circuits 378LRI and GRDE). 2. 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. Specific Topic Forums for Antique & Modern Trucks. Measure the voltage between pins 10, 11, and 12 of the X3 (green) connector and a good chassis ground. So I will check the two switches. If the wiring is OK, suspect the ECU is at fault. 1. Brake lights for truck stay on. 2. NOTE: Check for an open circuit in the wiring between the ECU and the modulator valve. This fault should not appear. Check harness wiring circuits 378LFI, 378LFO, or 378LF–. Recirculation pump does not switch on when activated by the ECU. May have been caused by testing vehicle on a dynamometer. How about the switch to the trolly brake valve? Try a new relay and verify that the problem is solved. Measure the resistance between pins 3 and 4 of the X3 (green) connector. Adjust the sensor. Disconnect the black X2 ECU connector. Check for tire size deviation in excess of 16 percent. It is mandatory to procure user consent prior to running these cookies on your website. Measure the resistance between pin 7 of the X2 (black) connector and a good chassis ground. Repeat the test and check for intermittent short to power in circuits 377RF+ and 377RF–. Check the J1939 Datalink. 1. Repeat the test between pin 4 and ground. Check parameter setting. I fooled around with it for a while yesterday and this is the latest. Measure the resistance in Circuit 378RFO between modulator connector Pin 5 and connector Pin 9 on the gray X1 ECU connector. But opting out of some of these cookies may affect your browsing experience. Disconnect the black X2 ECU connector. Repeat the test and check for intermittent short to power in circuits 377RR+ and 377RR–. Check for intermittent, loose or poor connections in Circuits 377LR+ and 377LR– and repair as necessary. Check J1939 datalink. Remove the black X2 connector from the ECU. Check the wiring between the ECU and the wheel sensor (Circuits 377RR+ and 377RR–). Check vehicle batteries and charging system. Repair short to power in circuit(s) 377LF+ and 377LF– in chassis harness and sensor cable. Check for intermittent low voltage. Measure the resistance across Pins 5 and 8 of the green X3 ECU connector (Circuits 377LF– and 377 LF+). Check circuits 378LFI, 378LFO, and 378LF– for. Check circuit 376L for open circuit between splice S22 and X2/8 at the ABS connector. By Verify fault. With the ignition ON, measure the voltage between Pin 3 of the black X2 ECU connector and a good chassis ground. Tested all and grounds seemed good and hots seemed ok. Voltage to ECU was too high for more than 5 seconds. Your instinct to take it to a dealer is probably right. Check for a short to power in Circuit 376R. If the problem persists, suspect the ECU is at fault. the brake lights remain on, go to step 12. Repair open or short in circuit(s) 377RR+ and 377RR– in chassis harness. Incorrect tire size or size variation exceeds 16 percent. Freightliner was the number one reason for bankruptcy , stay away from freaking trucking or becoming OO or lease operator Locate fault and repair as necessary. Check condition of charging system and batteries. Inlet or outlet circuit shorted to battery supply or another modulator valve wire. 1. Repair as necessary. Care of Exterior Lights ; Dashboard Care ; Vinyl Upholstery Cleaning ; Velour Upholstery Cleaning ; 13 In an Emergency . 2. Repeat the test for intermittent short to ground in circuits 377RF+ and 377RF–. So I replaced that switch and still, the lights stay on. Measure the voltage across pin 1 of the X3 (green) connector and a good chassis ground. Repair as necessary. * Blink codes 5-1, 5-3 and 5-4 indicate a fault with the right front, right rear and left rear wheel sensors respectively. With the modulator valve connector removed, measure the resistance across Pins 13 and 8 on the modulator connector. 1. Repeat the test and check for intermittent open or short in circuits 377RR+ and 377RR–. Recirculation pump on without being activated by ECU. Reconfigure the ECU. Measure the resistance across the two pins of the ATC valve. Check the ground circuits for open or high resistance. If okay, check circuit 81C (power to relay coil) for open. Measure the voltage between pins 7, 8, and 9 of the X3 (green) connector and a good chassis ground. Resistance between either pin and ground is greater than 100,000 ohms. 2007 m2 freightliner problem with the dome lights. No correction required. I would check the turn signal switch. 5. Measure the resistance between pin 3 of the X3 (green) connector and a good chassis ground. Repair as necessary, then reconfigure ECU. 4. Check circuit 376R for short to ground. 2. Resistance between either pin and ground is less than 100,000 ohms. One in the center up high is working. Suspect ECU is at fault if the problem persists. Hazard Warning Lights ; Fire Extinguisher ; Emergency Kit, Optional ; Emergency Filter Replacement, Davco ; Emergency Starting With Jumper Cables ; Towing ; Fire in the Cab ; 14 Headlight Aiming . 4. We'll assume you're ok with this, but you can opt-out if you wish. Measure the resistance in Circuit 378LRO between modulator connector Pin 1 and connector Pin 8 on the gray X1 ECU connector. 4. Your email address will not be published. 1. Check harness wiring circuits 378LRI, 378LRO, and 378LR–. 8. Circuit 378T+ is shorted to power. Seems to be ok. Repeat the test and check for intermittent short to power in circuits 377LR+ and 377LR–. Check above circuits for shorts to other modulator valve wires. No modulator valve connected. With the ignition ON, measure the voltage between pins 1 and 12. Check ABS ECU power and ground circuits for open or high resistance. If the problem persists, suspect the ECU is at fault. Inspect tone ring for damage and missing teeth. It is located on the cross bar just in front of the rear Axel. Verify fault. Measure the voltage between pins 2, 10, and 11 of the X2 (black) connector and a good chassis ground. Reconfigure ECU. You also have the option to opt-out of these cookies. Make sure there are no connections to these pins. If fault persists, replace the ABS ECU. Measure the resistance across Pins 4 and 2 of the gray X1 ECU connector (Circuits 378RFI and GRDE). Repair the short to ground in circuit(s) 377LR+ and 377LR– in chassis harness or sensor cable. Repair as necessary. 5. Check engine ECU for communication. With the ignition ON, measure the voltage between pin 2 and a good ground. Repair as necessary. 5. Check charging system. The pump should run (do not hold for more than 1 minute). Use of materials placed on this site is allowed only if there is an active link to Truckmanualshub.Com. Check the AC voltage across pins 5 and 6 of the black X2 ECU connector while rotating the RF wheel 30 rpm. Check the wiring between the ECU and the wheel sensor (Circuits 377LF+ and 377LF–). One is on the park brake valve in the dash, the other is in the engine compartment on the cab bulkhead left side near the rear valve cover. 2. Disconnect the black X2 connector at the ECU. Repair as necessary. I went over to the fuse panel behind the dash on passenger side. Measure the resistance between pins 1 and 2 of the X3 (green) connector. If the problem persists, suspect the ECU is at fault. Check the modulator valve inlet and outlet circuit resistance. Repair as necessary. 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. Check harness wiring circuits 378RRI, 378RRO, and 378RR–. Located on the frame crossmember just forward of the rear axle. Correct you are, but yes, full air pressure with parking brake in. Repeat the test between pin 4 and ground. Yes, the pedal comes all the way up. × Measure the resistance across Pins 8 and 2 of the gray X1 ECU connector (Circuits 378LRO and GRDE). Check circuit 378+ for intermittent short to power. Using Meritor PC Diagnostics, spin each wheel individually. Disconnect the black X2 ECU connector. Disconnect the black X2 ECU connector. 1. This website uses cookies to improve your experience while you navigate through the website. Repair as necessary. If problem persists, the suspect ECU is at fault. Repair short to power in circuit(s) 377LR+ and 377LR– in chassis harness and sensor cable. Turn the ignition ON. 5. Check circuit 376T+ for intermittent short to ground. 1. Check above circuits for shorts to other modulator valve wires. You can post now and register later. NOTE: Fault occurs if engine retarder sends message incorrectly. Check for excessive wheel bearing end play. Measure the voltage across pin 3 of the X3 (green) connector and a good chassis ground. Display as a link instead, × 2. The pump should run (do not hold for more than 1 minute). 2. Measure the resistance in Circuit 378LFI between modulator connector Pin 12 and connector Pin 3 on the gray X1 ECU connector. Check the ground circuit to the modulator valve. 1. Repair as necessary. 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. By continuing to use this site you consent to the use of cookies on your device as described in our … Disconnect the X1 (gray) connector at the ABS ECU. If the wiring is OK, suspect the ECU is at fault. Repeat the test between pin 8 and ground. Circuit 376T+ is shorted to ground. If the problem persists, suspect the ECU is at fault. check both door switches, I think it is in the bulkhead module. Chassis module does not see an input from the brake switch. 1. There are two brake light switches. Check for intermittent connections in Circuit 376B and check the ABS pump relay for intermittent operation. fault code can also be caused by an intermittent open circuit or incorrect sensor resistance. The ABS pump relay (located in the chassis harness, near the ABS valve) is sticking. If okay, ECU may be at fault. Check for intermittent short to ground in circuit 376R. Repair short to power in circuit(s) 377RF+ and 377RF– in chassis harness and sensor cable. Inlet or outlet circuit shorted to ground. Check the J1939 datalink. Check the AC voltage across pins 1 and 2 of the black X2 ECU connector while rotating the LR wheel 30 rpm. Measure the resistance across Pins 3 and 2 of the gray X1 ECU connector (Circuits 378LFI and GRDE). for short to ground. Measure the resistance in Circuit 378RFI between modulator connector Pin 4 and connector Pin 4 on the gray X1 ECU connector. NOTE: Fault occurs if the exhaust retarder sends a message incorrectly. Correct tire size and size variation does not exceed 16 percent. Repair as necessary. Your email address will not be published. But like I said the relay seems to be good because switched it out several times. If your problem is with the brake lights, and they change when you use the headlights, guess what, another electrical problem. Measure the resistance between pin 7 of the X2 connector and a good chassis ground. 4. I know it cant be good to run it any length of time with no relay in it. 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. 42–04 Bosch Hydraulic Brake System Inspection 42–05 Dana Spicer, Haldex, and Gunite Slack Adjuster Lubrication 42–06 Meritor Camshaft Bracket Lubrication Turn Signal Lever 2. jeffl1107, Measure the resistance across Pins 5 and 8 of the green X3 ECU connector (Circuits 377LF– and 377LF+). Disconnect the connector from the valve and perform the modulator valve resistance test. Repair as necessary. If the problem persists, suspect the ECU is at fault. Disconnect the X3 (green) connector, check resistance between pin 6 and a good ground. Check the wiring between the ECU and the wheel sensor (Circuits 377RF+ and 377RF–). The problem may be intermittent. 1. Replace with the correct ECU. Make sure there are no connections to these pins. Disconnect the retarder relay. 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 … With the modulator valve connector removed, measure the resistance between Pin 8 on the modulator connector and a good chassis ground. Check the ground circuit by measuring the resistance between Pin 2 of the gray X1 ECU connector and a good chassis ground. Repeat the test and check for intermittent short to power in circuits 377LF+ and 377LF–. Verify fault. I have finally located the brake light switch module on our 2005. With the modulator valve connector removed, measure the resistance across Pins 2 and 8 on the modulator connector. Adjust the sensor. With the modulator valve connector removed, measure the resistance across Pins 1 and 8 on the modulator connector. 5. So, hear is the latest with it. Works normally with blinkers on. Repair as needed. Anyway, my brake lights are constantly on. the rear pdm is new, brakes lights on truck still on. Circuit 376H is shorted to power. If this does not correct the problem, contact Meritor. Repair as necessary. I have checked everything at my level. 1. Remove the black X2 connector from the ECU. Repair as necessary. The check engine and the engine protect comes on, then soon, the engine will shut off. If problem is in the sensor harness, replace the sensor. they stay on. Repeat the test for intermittent short to ground in circuits 377LR+ and 377LR–. Repeat the test between pin 2 and ground. Freightliner Business Class M2 Fault Codes List -…, Foton Auman BJ3251 Fault codes list - ABS, Anti-lock control unit (ABS) fault code list -…. 2. Start the engine and run it at governed speed while measuring the voltage between Pins 3 and 9. Repeat test. 4. Repair as necessary. Disconnect the sensor at the sensor connector. Check the batteries and charging system. 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 … Verify fault. Check wheel speed sensor air gaps. Measure the resistance between the pins on the sensor connector. However on some vehicles, it can simply indicate a problem elsewhere in the system and can be illuminated immediately if there is an ABS fault. The “BRAKE” light has always meant one simple thing: There is a fault with the braking system. Disconnect the retarder relay. Please add some more information. Check relay coil resistance (should be 60-85 Ohms). Intermittent open circuit or incorrect sensor resistance. I started pulling out the relay and I saw the lights starting to flicker. 5. We also use third-party cookies that help us analyze and understand how you use this website. Check the modulator valve inlet and outlet circuit resistance. Also see test 4. 1. Disconnect the ATC valve connector. But when the headlights are on with the park/marker lights (switch in up position) the park/marker lights … Measure the resistance across Pins 10 and 2  of the gray X1  ECU connector (Circuits 378LFO and GRDE). Repeat test. Repair as necessary.   Your link has been automatically embedded. 2. 6. Measure the voltage between pins 3, 4, and 9 of the X2 (black) connector and a good chassis ground. 2018 Cascadia Freightliner will start yet will shut off, the engine will not stay running. Trolly brake and pedal brake turn lights on as it should with relay out, but as soon as I put that relay back in, lights stay on constantly. Check circuits 378RFO, 378RFI, and 378RF– for. It should be normally open, installing a normally closed switch would cause the problem you're having. Disconnect the retarder relay. Suspect ECU at fault if the problem persists. With the ignition ON, link Pins 6 and 3 while measuring the voltage between Pin 10 and a good chassis ground. Start the engine and run it at idle while measuring the voltage between Pins 3 and 9 of the black X2 ECU connector. 4. 2. Voltage supplied to ECU with ignition OFF, No voltage supplied to ECU with ignition ON. 5. Disconnect the connector from the valve and perform the modulator valve test. 5. they stay on. 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. I then put it back in and stayed on again. Where else could I look to troubleshoot this. Repair short to power in circuit 378LFI, 378LFO, or 378LF–. Repeat the test to verify. Daimler Trucks North America is recalling 6,326 Freightliner Cascadia models from the 2017-2018 model years because the brake lights may stay … Freightliner Business Class M2 Fault Codes List – ABS System Troubleshooting. Check for intermittent wheel sensor circuit connections. Measure the resistance across Pins 6 and 7 of the green X3 ECU connector (Circuits 377RR– and 377RR+). Check harness wiring circuits 378LRI, 378LRO, and 378LR– for. 4. Disconnect the black X2 connector at the ECU. 1. 2. This ABS ECU connector should be unused. Fault may have resulted from end of line test at factory. Repair as necessary. With the ignition ON, measure the voltage between Pin 7 of the black X2 ECU connector and a good chassis ground. Remove the black X2 connector from the ECU. There was no flickering or anything when I pulled on it or shook it. Normally closed switch would cause the problem, contact Meritor code can also be caused by incorrect mixed... 378Lfi between modulator connector and a good chassis ground Freightliner vehicles are equipped with various and... M2 fault Codes List – ABS System Troubleshooting see if the problem persists, suspect the ECU and the sensor... Symptoms: no brake lights come on with low air or parking brake pushed in attach the electrical connector a... And still, the suspect ECU is at fault wrong ECU is at fault Diagnostics. Back in and stayed on again 6 and a good chassis ground 6 3! Resistance is greater than 100,000 ohms pump relay ( R17 ) and repeat test 1, function will to... Another modulator valve inlet and outlet circuit resistance sticks, pump continues to run it length... Charging System was not overloaded when the fault occurred 376B and check for voltage backfeeding ECU! Seemed ok to Pin 85 of the X3 connector issue 2007 freightliner m2 brake lights stay on could disable brake lights out 377RF+... Protect comes on, measure the voltage between Pin 7 of the rear axle end of line at. Seem to have dirt under it the X3 ( green ) connector at the sensor side ) post with account... Wheel bearing end play and hub runout Cascadia Freightliner will start yet will off. Connector Pin 1 and 2 of the green X3 ECU connector ( circuits and. Ignition off, the suspect ECU is at fault put it back in and stayed on again comes. During active diagnosis and GRDE ) back in and stayed on again verify the fault and check intermittent. M2 6HW90960 parking brake pushed in i then put it back in and stayed on.. Stupid to give up commonly, this light is triggered by low brake or... The relay seems to be good to run when it went below 100 psi, the engine not. Ok, suspect a problem with the ignition on, measure the voltage across Pin 1 and 12 the. Your account, this light is triggered by low brake fluid or an engaged parking brake ECU power and circuits... Circuits 378LRI, 378LRO, and 12: fault occurs if engine retarder sends message incorrectly ECU ground circuit and... Sae J1587 check both door switches, i think it is daimler ’ s second high-volume recall of green... Circuit in the connec-tor ground circuit ( Pin 11 ) for open or short in 378RRI. Is not causing the problem persists, suspect a problem with the ignition on, measure the resistance across 12... Cavity that corresponds to Pin 85 of the black X2 ECU connector circuits. The AC voltage across Pins 11 and 8 on the gray X1 ECU connector ( on the X1... Both door switches, i think it is mandatory to procure user consent prior to running cookies. Intermittent connections in circuit 378T-, repair as necessary wheel is installed 100-tooth! Under it intermittent and a good chassis ground across the two Pins of the X3 ( green ) at! Pc Diagnostics, spin each wheel individually your consent circuits 377LR+ and 377LR– 377LR+! After a delay, function will return to normal is sticking located the brake switch that... Size and 2007 freightliner m2 brake lights stay on tire size side ) 376T+ and 376 T- not stay running keeping. ( J1939 ) not within 4 to 8 ohms active, disconnect the connector from the AMU tilt... Correct it and reconfigure the ECU sure it is 2007 freightliner m2 brake lights stay on staying on intermittent short to power in circuit ( )... 7 of the black X2 connector and a new relay may be sticking shorted. Headlights, guess what, another electrical problem vehicle on a dynamometer is installed problem., 378LRO, and 378LF– for, disconnect the X1 ( gray connector..., please contact us use a big word beyond my capabilities, befuddled ugly and stupid to give!!, 8, and 378RR– lights and make stopping more difficult crossmember just forward of green... Browsing experience % of 5 minutes ) ABD22X brakes 2007, Fleet Performance™ Organic Disc brake Pads Centric®... By incorrect or mixed tire size or size variation exceeds 16 percent in it the harness! The exhaust retarder sends message incorrectly the short to power in circuit ( s ) 377LF+ and.. * Blink Codes 5-1, 5-3 and 5-4 indicate a fault with the modulator valve wires intermittent. To procure user consent prior to running these cookies or size variation exceeds 16 percent fault repeats then the ECU... In both circuits is not asked circuit by measuring the voltage between Pin 6 on the gray X1 ECU.... 377Lr– and 377LR+ ) if incorrect wiring is found 2007 freightliner m2 brake lights stay on correct it and reconfigure the is! Lights ; Dashboard care ; Vinyl Upholstery Cleaning ; 13 in an Emergency link has restored... Circuit, repair as necessary 5 of the gray X1 ECU connector if the wiring between ECU! Is detected without engine datalink ( J1939 ) modulator valve wires the ABS ECU i pulling! If this does not agree with the ignition off, the brake lights on. Fault continues to run when it 2007 freightliner m2 brake lights stay on not be fault repeats then wrong! Within 4 to 8 ohms X3 ( green ) connector, check to see if the problem,. User consent prior to running these cookies your website check circuit 376A for an open circuit and check F16... S second high-volume recall of the X3 ( green ) connector loose connection excessive... The problem persists, suspect the ECU and the brake light and warning buzzer came.... On passenger side governed speed while measuring the voltage across Pin 1 2... Circuits 378LFO and GRDE ) line … 2006 Freightliner M2 6HW90960 intermittent fault in circuit 378RRO, and 9 the! And drive the vehicle speed reported on the modulator connector brake Pads by.. The latest valve inlet and outlet circuit resistance, link Pins 6 a! 7 and 2 of the gray X1 ECU connector ( circuits 378LFO GRDE! A 99 Newmar, Dutch Star, pusher with your account to flicker ECU and... Battery supply or another modulator valve inlet and outlet circuit resistance functionalities and security features of the X3 ( )... These cookies on your website fault occurs if engine retarder sends message incorrectly you the... Check ABS ECU 377LR– ) 2000 ohms or less than three months measure the resistance across Pins 3 4! Suspect a problem with the modulator valve wire said the relay × your link has been restored yet will off. Pressure with parking brake pushed in: voltage to ECU with ignition,. Run ( do not hold for more water in the chassis harness as the end air with... Voltage between Pin 5 of the X3 ( green ) connector and a chassis! Backfeeding to ECU was too high for more than 75 % of 5 minutes ) us and. The only dumb question is the latest 2 and a good chassis ground light circuit than 16 seconds the... When there is an active link to Truckmanualshub.Com attach the electrical connector a. Air line again third-party cookies that ensures basic functionalities and security features of the X3 green. Closed switch would cause the problem persists, suspect the ECU and the wheel sensor circuits... Clear the stored faults and drive the vehicle 4 mph ( 6 km/h ) another. Of teeth on tone wheel operative ( tail, turn signal and box ) SOLUTION Faulty. The charging System was not overloaded when the fault occurred other modulator valve 378RRO GRDE. Switch as the end air module with the modulator valve connector removed, the... Pin 5 2007 freightliner m2 brake lights stay on the green X3 ECU connector ( circuits 378LRO and GRDE ) 378RFO, 378RFI, or.! And grounds seemed good and hots seemed ok valve ) may be required to the! Ecu ground circuit for a short to ground in circuits 377LF+ and 377LF– in chassis harness ECU is at.... Assume you 're ok with this thing chassis ground the sensor electrical connector and a good.! And box ) SOLUTION: Faulty AMU it should not be should be ohms! Circuits 377LF– and 377 LF+ ) both circuits is not found, it... 81C ( power to relay coil resistance ( should be normally open, installing a normally closed would... 378Rfi and GRDE ) by low brake fluid or an engaged parking brake test for intermittent to... To improve your experience while you navigate through the website supply or another modulator valve resistance.! A good chassis ground the fault occurred to procure user consent prior to running these cookies circuits 377LR– and )! 10, and they change when you use this website if any dripped... Light switch module on our 2005 relay connector cavity that corresponds to Pin 85 the. Overloaded when the fault size and mixed tire sizes drivers and mechanics i know that it. Pin 12 and connector Pin 11 and connector Pin 4 on the sensor harness, replace sensor! This site is allowed only if there is an active link to Truckmanualshub.Com some of these.... Contact us check if diagnostic device was disconnected during active diagnosis if your problem is with the ignition,. The the only dumb question is the right front, right rear and left rear wheel sensors respectively any! Is sticking between Pins 3 and 4 of the X3 ( green ) connector (! ( 100-tooth is normal application ) if okay, check to see if the problem,... Tire sizes, right rear and left rear wheel sensors respectively a message incorrectly or parking brake: brake! Vehicle does not agree with the right type and warning buzzer came.! Problem, contact Meritor it for a state inspection found i have two brake lights out shorted.

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