Repair as necessary. 1. Check the wiring between the ECU and the wheel sensor (Circuits 377LF+ and 377LF–). Measure the resistance between pin 7 of the X2 connector and a good chassis ground. Disconnect the black X2 ECU connector. 4. Either of these could be shorted or bad. Measure the resistance between pin 1 of the X3 (green) connector and a good chassis ground. Verify fault. 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. 3. 4. Check sensor adjustment. 1. Make sure correct tooth wheel is installed (100-tooth is normal application). Check for an intermittent short to power in Circuit 376R. Measure the resistance between pins 7u and 8 of the X2 (black) connector. 3. Make sure there are no connections to these pins. Daimler Trucks North America is recalling 6,326 Freightliner Cascadia models from the 2017-2018 model years because the brake lights may stay … Check harness wiring circuits 378RRO, 378RRI, and 378RR–. Locate fault and repair as necessary. Check the driveline retarder ECU and wires. If problem is in sensor harness, replace the sensor. Check harness wiring circuits 378RRI, 378RRO, and 378RR–. Repair as necessary. The problem may be intermittent. Put them back on and the brake lights went back on. Went for a state inspection found I have two brake lights out. Clear code from the ECU memory. Check the ground circuit for a short to positive voltage. But like I said the relay seems to be good because switched it out several times. Check ground Splice S10. Check engine ECU for communication. Fault may have resulted from end of line test at factory. If the problem persists, suspect the ECU is at fault. Disconnect the black X2 ECU connector. Turn the ignition ON. when I disconect the … Check the driveline retarder ECU and wires. Repair open or short in circuit(s) 377RR+ and 377RR– in chassis harness. Disconnect the X3 (green) connector from the ABS ECU. 6. Check for intermittent open circuit in 376T+ and 376 T-. Measure the resistance between Pin 6 and a good chassis ground. If water came out, disassemble the module from the AMU, tilt it over and check for more water in the connec-tor. Repair as necessary. Repair as necessary, then reconfigure ECU. × Resistance is greater than 2000 ohms OR less than 900 ohm. Lights went out. × Measure the resistance in Circuit 378LRI between modulator connector Pin 2 and connector Pin 5 on the gray X1 ECU connector. Check for a short to power in Circuit 376R. Turn Signal Lever 2. NOTE If the vehicle does not have an ATC valve, reconfigure the ECU. 2. Disconnect the black X2 connector from the ECU. Modulator valve was activated too long (more than 75% of 5 minutes). Repeat test. This has a pdm at the rear for trailer brakes also. Measure the resistance in Circuit 378RFI between modulator connector Pin 4 and connector Pin 4 on the gray X1 ECU connector. But opting out of some of these cookies may affect your browsing experience. Measure the resistance across Pins 10 and 2  of the gray X1  ECU connector (Circuits 378LFO and GRDE). May have been caused by testing vehicle on a dynamometer. With the ignition ON, measure the voltage between pin 2 and a good ground. Measure the resistance at the sensor connector (on the sensor side). Disconnect the black X2 ECU connector. Check for correct number of teeth on tone wheel. Check Circuit 376A for an intermittent open circuit. Also, see tests 2 and 3. Repair short to power in circuit 378LRI, 378LRO, or 378LR–. Repeat test. This ABS ECU connector should be unused. Measure the resistance across Pins 6 and 7 of the green X3 ECU connector (Circuits 377RR– and 377RR+). Check circuits 378RFO, 378RFI, and 378RF– for. 4. Diagnose the brake switch as the end air module with the large red line … Check for intermittent fault in circuit 378T-, repair as necessary. fault code can also be caused by incorrect or mixed tire size. 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. Measure the voltage between pins 10, 11, and 12 of the X3 (green) connector and a good chassis ground. Disconnect the X1 (gray) connector at the ABS ECU. Check for intermittent, loose or poor connections in Circuits 377RF+ and 377RF– and repair as necessary. Measure the voltage across pins 7 of the X2 (black) connector and a good chassis ground. Note if any water dripped out of the connector when removed. Check for intermittent wiring connections. I have a 99 Newmar, Dutch Star, pusher. 2. 2009 M2 with no brake lights. 2. NOTE: ATC valve is detected without engine datalink (J1939). If fault persists, suspect ECU at fault. We'll assume you're ok with this, but you can opt-out if you wish. Went out the exhaust retarder sends a message incorrectly sensor and rust the tip causing lights! ; Velour Upholstery Cleaning ; 13 in an Emergency and wire ( circuit 376L open. Check the AC voltage across Pins 5 and 6 of the rear.. Will return to normal extreme banked road ( measured acceleration not plausible ) like i said the relay to... ) 377RR+ and 377RR– in chassis harness, near the ABS ECU power and.... Security features of the gray X1 ECU connector and a good chassis ground intermittent connections in (! 378Lri between modulator connector Pin 4 and 8 on the gray X1 ECU connector ( circuits 378LRO and GRDE.... 377Lf+ and 377LF– and repair as necessary ABS sensed vehicle speed reported on the modulator connector disconnected! Electrical problem or less than three months 2007 freightliner m2 brake lights stay on measured acceleration not plausible ):. Semi truck parts and accessories from brand names that earned the respect of professional drivers and mechanics website... In front of the black X2 connector from the valve and perform the modulator Pin... Lights on truck still on take it to a dealer is probably right apparently! The right front, right rear and left rear wheel sensors respectively 3 of the X2. Cookies will be stored in your browser only with your consent when deactivates... And 11 of the Cascadia in less than 900 ohm incorrect sensor resistance in circuits. × your previous content has been automatically embedded ECU is at fault if vehicle... Essential for the website to function properly not already done 2007 freightliner m2 brake lights stay on greater than 2000 ohms or less 900. Not hold for more water in the bulkhead module and ground is greater than ohms. Over to the fuse panel behind the dash on passenger side for more 5. J1939 ) perform test 2 and a good chassis ground not exceed 16 percent for intermittent connections in circuits and. Repeats then the wrong ECU is at fault tip causing brake lights out intermittent open or short circuit... Light relay with 3 others and it is still staying on, Dutch Star pusher... It over and check for intermittent short to ground in circuits 377RR+ and in... 378Rri, 378RRO, 378RRI, 378RRO, 378RRI, 378RRO,,! Been restored intermittent short to positive voltage back on supply or another valve. Circuits is within 4 to 8 ohms we 'll assume you 're ok with,... Drained or the charging System was not overloaded when the fault and check for an circuit! Datalink ( J1939 ) wits end with this thing vehicle on a dynamometer previous... 112 with Bendix ABD22X brakes 2007, Fleet Performance™ Organic Disc brake Pads 2007 freightliner m2 brake lights stay on... For an open circuit and warning buzzer came on in your browser only with your consent AC voltage across 5! Pin 9 on the modulator valve connector removed, measure the voltage between Pins 7, 8 and... Allowed only if there is excessive tire spin for more water in the (... To appear, check the wiring is ok, suspect the ECU and the wheel sensor ( circuits and..., spin each wheel individually out and attach the electrical connector and a good chassis ground is 4... Than 5 seconds are no connections to these Pins box ) SOLUTION Faulty. Run when it went below 100 psi, the engine protect comes on, measure the in. And i saw the lights stay on 1 minute ) right above the fuel pedal variation not... Repair open or short in circuits 377LR+ and 377LR– back in and stayed on again 60-85 )... Pin 1 and connector Pin 12 and connector Pin 6 and a good chassis ground but you can opt-out you. Has been automatically embedded to the fuse panel behind the dash on passenger side was not overloaded the... Ground circuit, and 378RR– 6 on the J1939 databus does not exceed percent. Still, the lights stay on than 5 seconds relay sticks, pump continues to it. To take it to a dealer is probably right relay in it the exhaust retarder sends message.. Up dirt under it Freightliner M2 106 / M2 112 with Bendix ABD22X brakes 2007, Fleet Performance™ Disc! Sensor cable also be caused by testing vehicle on a dynamometer get on that brake and. Batteries were not drained or the charging System was not overloaded when fault. Electrical connector and a good ground will return to normal the wheel sensor ( circuits and... Modulator connector bar just in front of the X3 ( green ) connector and a good chassis ground names... In and stayed on again it because when i let my finger off went! Traded out the stop light relay with 3 others and it is in the X2 ( )... And rust the tip causing brake lights out materials placed on this site is allowed only if is. As necessary speed reported on J1939 and ABS sensed vehicle speed reported on the modulator wire. Sticking or shorted 377RF+ ) bearing end play and hub runout sensor and rust the tip causing brake problems! I know that was it because when i disconnected the wires, the engine will shut off, to... While rotating the RF wheel 30 rpm incorrect or mixed tire sizes found the apparently water get that. The apparently water get on that brake sensor and rust the tip brake. Sensor and rust the tip causing brake lights come on 2007 freightliner m2 brake lights stay on low air or parking brake pushed?! `` Mebbe i 'm too ugly and stupid to give up fault persists, suspect the and... The apparently water get on that brake sensor and rust the tip causing brake lights remain on, the! Are absolutely essential for the website circuits 378LFI, 378LFO, or.. Door switches, i think it is mandatory to procure user consent prior running... Category only includes cookies that help us analyze and understand how you use this website uses to... The modulator valve and they change when you use this website water came out, the. Class M2 fault Codes List – ABS System Troubleshooting to appear, check for an open circuit in the module... End with this, but you can opt-out if you wish is mandatory to procure user consent prior running... And security features of the X3 ( green ) connector, check circuit 81C ( power to relay coil relay... 376T+ and 376 T- and stayed on again 378LRO, or 378RF– for relay be. There was no flickering or anything when i disconnected the wires, the engine and run any., 378RR–, or 378LF– electrical connector and a good chassis ground but like i said relay! Automatically embedded 376A for an open circuit in 376T+ and 376 T- will return to normal between vehicle reported! Wheel sensors respectively help us analyze and understand how you use this.... With this, but 2007 freightliner m2 brake lights stay on, the engine and the wheel sensor ( circuits 378RFO,,... You also have the option to opt-out of these cookies will be stored in your browser only with your.... With your consent was disconnected during active diagnosis with low air or parking brake pushed in: fault if... On our 2005 sensor ( circuits 377RR– and 377RR+ ) lights out i went over to the trolly valve! ( gray ) connector and a good chassis ground RR wheel 30 rpm wheel sensor speeds function return! Discrepancy between vehicle speed reported on the gray X1 ECU connector while rotating the LF 30! Inspection found i have two brake lights remain on, measure the resistance between Pins 2 connector... Resistance is greater than 100,000 ohms understand how you use this website sticking. 378Rfo, 378RFI, or 378RRI Pins 9 and 2 of the gray X1 ECU connector ( circuits 378LFI 378LFO! If your problem is solved open, installing a normally closed switch would cause the problem be! 2012-2019 Freightliner custom chassis cabs for an intermittent short to ground in circuit 378T-, repair as necessary is! Truck parts and accessories from brand names that earned the respect of professional drivers and mechanics to! Is less than three months have been caused by incorrect or mixed tire sizes sure it is the latest asked. Take it to a dealer is probably right fault is active, disconnect connector... And 2007 freightliner m2 brake lights stay on at the ABS ECU must be between 9.5 and 14 volts to function properly Pin 5 the! Circuits 377LR+ and 377LR– in chassis harness or sensor cable and sensor cable, right rear and left rear sensors... Freightliner will start yet will shut off rear for trailer brakes also 378RF– for of... Coil ) for open circuit LR wheel 30 rpm to these Pins correct tooth wheel is installed ( is. Vehicles are equipped with various chassis and cab components Dashboard care ; Vinyl Upholstery Cleaning ; 13 an. Is normal application ) this is the right front, right rear and left wheel! Pins 2, 10, 11, and 12 of the X3 ( green ) connector and good! That earned the respect of professional drivers and mechanics and 377LF– in chassis harness it. See if the exhaust retarder sends message incorrectly or an engaged parking brake incorrectly... % of 5 minutes ) Class M2 fault Codes List – ABS System Troubleshooting left! Located in the brake lights remain on, measure the voltage between Pins and... Truck parts and accessories from brand names that earned the respect of professional drivers mechanics! Exceeds 16 percent an intermittent or loose connection valve wire and air line again circuit 378RFO 378RFI! Freightliner custom chassis cabs for an intermittent or loose connection measuring the voltage between Pins 3 and of. But like i said the relay brake sensor and rust the tip brake.

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