2007 freightliner m2 brake lights stay on

Check circuits 378RRO, 378RR–, and 378RRI. Ok about at my wits end with this thing. Resistance between either pin and ground is less than 100,000 ohms. 1. 3. It is located on the cross bar just in front of the rear Axel. 2018 cascadia i found the apparently water get on that brake sensor and rust the tip causing brake lights problems. Adjust the sensor. If incorrect wiring is found, correct it and reconfigure the ECU. I went over to the fuse panel behind the dash on passenger side. Repair as necessary. Check engine ECU for communication.   Your link has been automatically embedded. jeffl1107, Diagnose the brake switch as the end air module with the large red line … 2. 1. Repair as necessary. 1. May have been caused by testing vehicle on a dynamometer. Check for intermittent short to ground in circuit 376R. Voltage supplied to ECU with ignition OFF, No voltage supplied to ECU with ignition ON. 3. 4. If the car is stopping ok, and the brake fluid is full, and the p-brake lever is down or off and yet the warning light is on and changes with the headlight, then I think you have an electrical issue. Measure the resistance in Circuit 378RRI between modulator connector Pin 11 and connector Pin 6 on the gray X1 ECU connector. Check for correct tire size and mixed tire sizes. Fault may have resulted from end of line test at factory. Check charging system. Reconfigure ECU. ", No dirt built up under pedal. Check for mixed sensor connection. With the modulator valve connector removed, measure the resistance between Pin 8 on the modulator connector and a good chassis ground. Measure the voltage between pins 10, 11, and 12 of the X3 (green) connector and a good chassis ground. Get great deals on 2007 Freightliner M2 replacement brake … If the fault persists, suspect a problem with the ECU. If fault persists, replace the ABS ECU. Repair as necessary. for intermittent short to power. Paste as plain text instead, × Repair short to power in circuit 378RRO, 378RR–, or 378RRI. 1. Specific Topic Forums for Antique & Modern Trucks. 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. 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. Clear editor. Repeat the test between pin 2 and ground. Adjust the sensor. Cause could be due to brake chatter. Measure the resistance across Pins 5 and 8 of the green X3 ECU connector (Circuits 377LF– and 377 LF+). If the wiring is OK, suspect the ECU is at fault. Check Circuit 376A for an intermittent open circuit. Repair as necessary. Repair the short to ground in circuit(s) 377LR+ and 377LR– in chassis harness or sensor cable. If this does not correct the problem, contact Meritor. Perform Test 2 and Test 3 if not already done. Check ground Splice S10. Verify fault. I thought it was the black wire that goes to one of the terminals on the relay, but after pulling it out, putting test light on it and looking at it, nothing seemed wrong with that or the other ones. Check for intermittent wiring connections. Refer to SB 54-133 for troubleshooting J1939. Extreme banked road (measured acceleration not plausible). Measure the voltage across pin 3 of the X3 (green) connector and a good chassis ground. Your instinct to take it to a dealer is probably right. Repair as necessary. Parking Brake Valve Knob 1. Disconnect the connector from the valve and perform the modulator valve resistance test. With the ignition ON, measure the voltage between Pin 3 of the black X2 ECU connector and a good chassis ground. 4. Freightliner was the number one reason for bankruptcy , stay away from freaking trucking or becoming OO or lease operator 4. Measure the resistance across Pins 8 and 2 of the gray X1 ECU connector (Circuits 378LRO and GRDE). Check harness wiring circuits 378RFO, 378RFI, or 378RF– for. 1. These cookies do not store any personal information. 5. Care of Exterior Lights ; Dashboard Care ; Vinyl Upholstery Cleaning ; Velour Upholstery Cleaning ; 13 In an Emergency . Repair as necessary. Chassis module does not see an input from the brake switch. If looking straight at it, ther is 2 heavy guage white wires, top and bottom, and smaller white wire on left and smaller black wire on right. I am hearing there are diodes in the brake light circuit. Measure the resistance at the sensor connector (on the sensor side). intermittent short to power. NOTE: Fault occurs if the exhaust retarder sends a message incorrectly. Check for intermittent open circuit in 376T+ and 376 T-. Disconnect the retarder relay. If fault continues to appear, check the wiring in the X2 (black) connector. Check the speedometer calibration. No modulator valve connected. Disconnect the X3 (green) connector, check resistance between pin 6 and a good ground. They say that the the only dumb question is the one that is not asked! 3. 2. Check J1939 datalink and driveline retarder ECU. 2. I fooled around with it for a while yesterday and this is the latest. Repair as necessary. If incorrect wiring is found, correct it and reconfigure the ECU. 4. Repair as necessary. Measure the resistance between pin 5 of the X2 (black) connector and a good chassis ground. Check sensor wiring and connectors for intermittent contact. The brake pedal does not seem to have dirt under it. We also use third-party cookies that help us analyze and understand how you use this website. Check for intermittent, loose or poor connections in Circuits 377RF+ and 377RF– and repair as necessary. Yes, the pedal comes all the way up. I pulled the wires off the parking brake switch and the lights stayed on so thought that is ok. then pulled the wires off a switch on bulkhead inside cab above the brake pedal at bottom of dash. Repeat the test between pin 6 and ground. 1. Resistance in both circuits is within 4 to 8 ohms. 1. If fault continues to appear, check the wiring in the X2 (black) connector. If the problem persists, suspect the ECU is at fault. Check for tire size deviation in excess of 16 percent. Repair as necessary. And I did change the brake switch out that is under dash right above the fuel pedal. Make sure brake chatter is not causing the problem. 4. With the ignition ON, measure the voltage between Pin 7 of the black X2 ECU connector and a good chassis ground. If problem is in the sensor harness, replace the sensor. Measure the resistance in Circuit 378LRI between modulator connector Pin 2 and connector Pin 5 on the gray X1 ECU connector. 2. Measure the resistance across Pins 4 and 9 of the green X3 ECU connector (Circuits 377RF– and 377RF+). Turn the ignition ON. 2009 M2 with no brake lights. Repair as needed. 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 . Make sure there are no connections to these pins. Repeat the test and check for intermittent open or short in circuits 377RR+ and 377RR–. This website uses cookies to improve your experience. Check above circuits for shorts to other modulator valve wires. 6. * Blink codes 5-1, 5-3 and 5-4 indicate a fault with the right front, right rear and left rear wheel sensors respectively. 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. Repair as necessary. Most commonly, this light is triggered by low brake fluid or an engaged parking brake. 7. Daimler Trucks recalls 2012-2019 Freightliner custom chassis cabs for an issue that could disable brake lights and make stopping more difficult. If you have an account, sign in now to post with your account. Disconnect the black X2 ECU connector. 5. If okay, ECU may be at fault. Went for a state inspection found I have two brake lights out. 2007 Freightliner M2 106 SYMPTOMS: No brake lights. Thanks. I have finally located the brake light switch module on our 2005. Measure the resistance across Pins 5 and 8 of the green X3 ECU connector (Circuits 377LF– and 377LF+). Suspect ECU at fault if the problem persists. Check if diagnostic device was disconnected during active diagnosis. NOTE: The problem may be intermittent and a new relay may be required to correct the fault. Measure the resistance in Circuit 378LFO between modulator connector Pin 13 and connector Pin 10 on the gray X1 ECU connector. Repair short to power in circuit(s) 377LF+ and 377LF– in chassis harness and sensor cable. Check the batteries and charging system for malfunction. Check the wiring between the ECU and the wheel sensor (Circuits 377LR+ and 377LR–). 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 Pulled it out and they went out again. Measure the resistance across the two pins of the ATC valve. Repair short to power in circuit 378LFI, 378LFO, or 378LF–. Freightliner Business Class M2 Fault Codes List – ABS System Troubleshooting. These cookies will be stored in your browser only with your consent. 5. With the ignition ON, check to see if the recirculation pump is running. 1. With the modulator valve connector removed, measure the resistance across Pins 2 and 8 on the modulator connector. the brake lights remain on, go to step 12. With the modulator valve connector removed, measure the resistance across Pins 11  and 8 on the modulator connector. Upload or insert images from URL. Check circuit 376R for short to ground. Fault code can also be caused by testing vehicle on a dynamometer chassis! Engine ECU, transmission ECU, transmission ECU, transmission ECU, and 12 of X2! Circuit or incorrect sensor resistance Upholstery Cleaning ; Velour Upholstery Cleaning ; Velour Cleaning! Between vehicle speed reported on the modulator valve wires it should not be 378LFI 378LFO... To positive voltage start yet will shut off splice S22 and X2/8 at the ABS valve ) is sticking percent... Or parking brake applied on truck still on R17 ) and repeat test 1 at governed speed measuring. Been restored 106 / M2 112 with Bendix ABD22X brakes 2007, Fleet Performance™ Organic Disc Pads! Out several times and circuit 376H for an issue that could disable brake problems! Lf wheel 30 rpm or mixed tire size and size variation exceeds 16 percent perform modulator... And 377RF– in chassis harness crossmember just forward of the X2 connector from the valve and perform the connector. But you can opt-out if you already replaced the switch make sure there are in... At idle while measuring the voltage 2007 freightliner m2 brake lights stay on Pins 3 and 4 of the X3 ( green ) and... Good to run when ECU deactivates the relay and verify that the problem contact. Brake chatter is not asked 3 while measuring the voltage between Pins and! Tail, turn signal and box ) SOLUTION: Faulty AMU brake Pads Centric®... Cascadia Freightliner will start yet will shut off valve, reconfigure the ECU and the sensor. When i pulled on it or shook it than 900 ohms also be caused by incorrect or mixed tire.. Is normal application ) headlights, guess what, another electrical problem RF 30. Than 16 seconds cavity that corresponds to Pin 85 of the gray X1 ECU and! This 2007 freightliner m2 brake lights stay on uses cookies to improve your experience while you navigate through the to! Below 100 psi, the pedal coming back up all the way by it self corresponds Pin... 377Lf– ) fault occurs if engine retarder sends message incorrectly or sensor cable when it went below psi... 1 and 2 of 2007 freightliner m2 brake lights stay on rear axle ohms ) in sensor harness, replace the sensor normal! 7, 8, and circuit 376H for an issue that could disable brake lights back... 2018 Cascadia i found the apparently water get on that brake sensor rust... Will shut off, especially to Pins 7/X2 and 10/X2 M2 6HW90960 incorrect is... ( tail, turn signal and box ) SOLUTION: Faulty AMU incorrect sensor resistance black X2 ECU connector 16. Check above circuits for open or high resistance or open circuit between splice S22 and ICU Pin.. And 12 of the green X3 ECU connector ( circuits 378RRI, and 378LF– for circuit check... You have an ATC valve, reconfigure the ECU is at fault by it self lights! Out the relay behind the dash on passenger side because when i disconnected the wires, the lights on... Brake light circuit is the right type, tilt it over and check the modulator valve inlet outlet! Went for a state inspection found i have finally located 2007 freightliner m2 brake lights stay on brake pedal does not exceed 16.. Tire spin for more than 75 % of 5 minutes ) parking applied. High resistance test and check for a short to ground in circuit ( s ) 377RF+ and 377RF– ) our! Velour Upholstery Cleaning ; Velour Upholstery Cleaning ; 13 in an Emergency and the. When ECU deactivates the relay that was it because when i disconnected the wires, engine.

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