2. 1. The vehicle speed reported on the J1939 databus does not agree with the wheel sensor speeds. Resistance in both circuits is not within 4 to 8 ohms. 4. 5. If problem is in the sensor harness, replace the sensor. If incorrect wiring is found, correct it and reconfigure the ECU. Measure the voltage across pin 1 of the X3 (green) connector and a good chassis ground. Repair the short to ground in circuit(s) 377RF+ and 377RF– in chassis harness or sensor cable. Please add some more information. Correct you are, but yes, full air pressure with parking brake in. Mixed tire sizes can cause this fault. Make sure brake chatter is not causing the problem. Measure the voltage between pin 5 of the X3 (green) connector and a good chassis harness. Reconfigure the ECU. 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 1. 4. If the problem persists, suspect the ECU is at fault. Check the modulator valve inlet and outlet circuit resistance. Repair as necessary. Measure the resistance between pins 3 and 4 of the X3 (green) connector. One wheel was much faster than the other. With the modulator valve connector removed, measure the resistance across Pins 11  and 8 on the modulator connector. Measure the resistance in Circuit 378RRO between modulator connector  Pin 10 and connector Pin 7 on the gray X1 ECU connector. Check harness wiring circuits 378LFI, 378LFO, or 378LF–. Disconnect the retarder relay. Measure the voltage between pins 3, 4, and 9 of the X2 (black) connector and a good chassis ground. This fault should not appear. These cookies do not store any personal information. Check Circuit 376H for a short to ground. 5. 1. Check charging system. Measure the voltage across pin 3 of the X3 (green) connector and a good chassis ground. 1. 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. Thanks for the help. 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. Most commonly, this light is triggered by low brake fluid or an engaged parking brake. But opting out of some of these cookies may affect your browsing experience. Repair as necessary. 1. Fault may have resulted from end of line test at factory. Go to Test 4. 5. Adjustment solved the problem. If this does not correct the problem, contact Meritor. 2. 1. Repair as necessary. By continuing to use this site you consent to the use of cookies on your device as described in our … Check wheel speed sensor air gaps. Replace the relay. 2007 Freightliner M2 106 SYMPTOMS: No brake lights. Measure the voltage between pins 7, 8, and 9 of the X3 (green) connector and a good chassis ground. Check for excessive wheel bearing end play and hub runout. Check for an intermittent short to power in Circuit 376R. Resistance reading between 500 and 2000 ohms. Get great deals on 2007 Freightliner M2 replacement brake … 4. check both door switches, I think it is in the bulkhead module. 4. I would check the turn signal switch. Also, see tests 2 and 3. 5. 3. With the modulator valve connector removed, measure the resistance across Pins 10 and 8 on the modulator connector. Check for the tire size mismatch. Check J1939 datalink. Green. Check circuit 376L for open circuit between splice S22 and X2/8 at the ABS connector. Repair short to power in circuit 378LRI, 378LRO, or 378LR–. If okay, ECU may be at fault. Check the ECU ground circuit (GND). Check relay coil resistance (should be 60-85 Ohms). Put them back on and the brake lights went back on. Check circuits 378LRI, 378LRO, and 378LR– for. If the problem is not found, verify the fault and check the ECU. Seems to be ok. 5. The ABS pump relay (located in the chassis harness, near the ABS valve) is sticking. Freightliner Business Class M2 Fault Codes List -…, Foton Auman BJ3251 Fault codes list - ABS, Anti-lock control unit (ABS) fault code list -…. Repair as necessary. Disconnect the retarder relay. Measure the resistance between pin 7 of the X2 connector and a good chassis ground. 4. 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. If the problem persists, suspect the ECU is at fault. so here i go, Are you checking every thing with full air pressure and parking brake pushed in? It should be normally open, installing a normally closed switch would cause the problem you're having. Disconnect the connector from the valve and perform the modulator valve test. I traded out the stop light relay with 3 others and it is still staying on. I have finally located the brake light switch module on our 2005. Check for correct number of teeth on tone wheel. ?The reason i ask is because some macks brake lights come on with low air or parking brake applied. Steering and Brake Systems 03/10/99 f610291 1. Disconnect the ATC valve connector. Check the wiring between the ECU and the wheel sensor (Circuits 377RF+ and 377RF–). jeffl1107, If more exists, shake it out and attach the electrical connector and air line again. Check sensor wiring and connectors for intermittent contact. Cause could be due to brake chatter. Repair as necessary. If fault continues to appear, check the wiring in the X2 (black) connector. 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). Voltage to ECU was too high for more than 5 seconds. This fault should not appear. I know it cant be good to run it any length of time with no relay in it. This fault is for reporting only. I am now, to use a big word beyond my capabilities, befuddled! Check condition of charging system and batteries. Repair as necessary. Try a new relay and verify that the problem is solved. Repair as necessary. If okay, check circuit 81C (power to relay coil) for open. 4. Pulled trolly brake and worked normally. NOTE: This fault indicates a discrepancy between vehicle speed reported on J1939 and ABS sensed vehicle speed. Incorrect or mixed tire size NOTE: This SAE J1587. Required fields are marked *. More than 400,000 Freightliner and Western Star trucks manufactured in the last decade are being recalled due to a defect that could cause brake lights not to work. Check engine ECU for communication. Check the engine ECU and wires. Repeat the test for intermittent short to ground in circuits 377LF+ and 377LF–. Circuit 376T+ is shorted to ground. 5. Check for intermittent connections in Circuit 376B and check the ABS pump relay for intermittent operation. If the problem persists, suspect the ECU is at fault. 4. Repeat the test to verify. × Pushed on the brake pedal worked normally. Paste as plain text instead, × Resistance between either pin and ground is greater than 100,000 ohms. 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 that output is from the correct sensor. The pump should run (do not hold for more than 1 minute). Voltage may have been temporarily too low. Check for mixed sensor connection. Repair open or short in circuit(s) 377RF+ and 377RF– in chassis harness. Clear the stored faults and drive the vehicle 4 mph (6 km/h). If fault persists, replace the ABS ECU. I have checked everything at my level. 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). After a delay, function will return to normal. Repair as necessary. With the ignition ON, measure the voltage between Pin 10 and a good chassis ground. If the problem persists, suspect the ECU is at fault. Recirculation pump does not switch on when activated by the ECU. 2006 freightliner M2 6HW90960. 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. Display as a link instead, ×   You cannot paste images directly. 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. Intermittent open circuit or incorrect sensor resistance. * Blink codes 5-1, 5-3 and 5-4 indicate a fault with the right front, right rear and left rear wheel sensors respectively. So, hear is the latest with it. Check for intermittent low voltage. With the ignition ON, measure the voltage between pins 1 and 12. 1. 1. If okay, ECU may be at fault. 2018 Cascadia Freightliner will start yet will shut off, the engine will not stay running. Measure the resistance between pin 5 of the X2 (black) connector and a good chassis ground. Measure the resistance across Pins 6 and 7 of the green X3 ECU connector (Circuits 377RR– and 377RR+). Repeat test. Your instinct to take it to a dealer is probably right. Inspect tone ring for damage and missing teeth. Repeat the test and check for intermittent short to power in circuits 377LF+ and 377LF–. 1. 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. Check for intermittent sources of high voltage. Disconnect the black X2 ECU connector. Voltage supplied to ECU with ignition OFF, No voltage supplied to ECU with ignition ON. 2. Check the AC voltage across Pins 4 and 9 of the green X3 ECU connector (Circuits 377RF+ and 377RF–) while rotating the right front wheel 30 rpm. Repeat test. Disconnect the black X2 connector from the ECU. Re- configure the ECU. Locate fault and repair as necessary. 4. 1. Resistance between either pin and ground is less than 100,000 ohms. If water came out, disassemble the module from the AMU, tilt it over and check for more water in the connec-tor. It is located on the cross bar just in front of the rear Axel. Check harness wiring circuits 378RFO, 378RFI, or 378RF–. Repeat the test and check for intermittent open or short in circuits 377RR+ and 377RR–. 8. Measure the resistance in Circuit 378LRI between modulator connector Pin 2 and connector Pin 5 on the gray X1 ECU connector. Verify the fault. Disconnect the X1 (gray) connector at the ABS ECU. Circuit 376H is shorted to power. Disconnect the X3 (green) connector, check resistance between pin 6 and a good ground. Disconnect the sensor at the sensor connector. 2. Repair as needed. To do so could damage the Fig. Repair the short to ground in circuit(s) 377LR+ and 377LR– in chassis harness or sensor cable. 3. Disconnect the X1 (gray) connector at the ABS ECU. Disconnect the sensor connector from the chassis harness. Check harness wiring circuits 378LFI, 378LFO, or 378LF– for. Necessary cookies are absolutely essential for the website to function properly. Measure the voltage across pin 5 of the X2 (black) connector and a good chassis ground. Disconnect the black X2 connector at the ECU. the brake lights remain on, go to step 12. This fault usually occurs when there is excessive tire spin for more than 16 seconds. Check for a short to power in Circuit 376B causing the pump to run when  it should not be. Measure the resistance across Pins 4 and 2 of the gray X1 ECU connector (Circuits 378RFI and GRDE). Check for excessive wheel bearing end play. Repair as necessary. Check for correct tire size and mixed tire sizes. check both door switches, I think it is in the bulkhead module. Check the wiring between the ECU and the wheel sensor (Circuits 377LF+ and 377LF–). Measure the resistance in Circuit 378RFO between modulator connector Pin 5 and connector Pin 9 on the gray X1 ECU connector. Inlet or outlet circuit shorted to ground. By If fault repeats then the wrong ECU is installed. We also use third-party cookies that help us analyze and understand how you use this website. Trailer Air Supply Valve Knob 9/26/95 f461056 2. 42–04 Bosch Hydraulic Brake System Inspection 42–05 Dana Spicer, Haldex, and Gunite Slack Adjuster Lubrication 42–06 Meritor Camshaft Bracket Lubrication With the ignition ON, measure the voltage between Pin 3 of the black X2 ECU connector and a good chassis ground. With the modulator valve connector removed, measure the resistance between Pin 8 on the modulator connector and a good chassis ground. 1.   Pasted as rich text. If you have any questions, please contact us. Measure the resistance in Circuit 378LFI between modulator connector Pin 12 and connector Pin 3 on the gray X1 ECU connector. Located on the frame crossmember just forward of the rear axle. Repair short to power in circuit 378RFO, 378RFI, or 378RF–. With the ignition ON, measure the voltage between Pin 7 of the black X2 ECU connector and a good chassis ground. With the ignition ON, check to see if the recirculation pump is running. Measure the resistance across Pins 6 and 2 of the gray X1 ECU connector (Circuits 378RRI and GRDE). Check ABS ECU power and ground circuits for open or high resistance. Thanks. There are two brake light switches. Check harness wiring circuits 378RRI, 378RRO, and 378RR–. Disconnect the black X2 ECU connector. Check parameter setting. Check the ground circuit (pin 11) for high resistance or open circuit. for short to ground. 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. Check for intermittent, loose or poor connections in Circuits 377RR+ and 377RR– and repair as necessary. Brake lights for truck stay on. Perform Test 2 and Test 3 if not already done. I went over to the fuse panel behind the dash on passenger side. 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. Make sure there are no connections to these pins. 4. 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. The pump should run (do not hold for more than 1 minute). 3. 1. Adjust the sensor. Repeat the test between pin 6 and ground. If okay, replace the ICU. Measure the resistance across Pins 3 and 10 of  the green X3 ECU connector (Circuits 377LR– and 377LR+). Check the wiring between the ECU and the wheel sensor (Circuits 377LF+ and 377LF–). They say that the the only dumb question is the one that is not asked! Copyright 2020 ©. Disconnect the retarder relay. Repair as necessary. Measure the resistance between pins 5 and 6 of the X2 (black) connector. Check the ground circuit for a short to positive voltage. 1. 1. 3. 5. Check sensor adjustment. Circuit 378T+ is shorted to power. Repeat the test for intermittent short to ground in circuits 377RR+ and 377RR–. 4. Check the driveline retarder ECU and wires. With the ignition ON, momentarily link Pins 6 and 3. The check engine and the engine protect comes on, then soon, the engine will shut off. 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. Diagnose the brake switch as the end air module with the large red line … Repair as necessary. If your problem is with the brake lights, and they change when you use the headlights, guess what, another electrical problem. Adjust the sensor. Recirculation pump on without being activated by ECU. 4. Check for tire size deviation in excess of 16 percent. Measure the resistance across Pins 6 and 7 of the green X3 ECU connector (Circuits 377RR– and 377RR+). 4. Check the AC voltage across pins 1 and 2 of the black X2 ECU connector while rotating the LR wheel 30 rpm. Check the ECU ground circuit (GND) for an intermittent or loose connection. 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. And I did change the brake switch out that is under dash right above the fuel pedal. 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 Check Circuit 376A for an open circuit and check Fuse F16. Verify fault. If you already replaced the switch make sure it is the right type. Adjust the  sensor. Repair as necessary. Remove the black X2 connector from the ECU. Verify fault. Verify fault. Modulator valve was activated too long (more than 75% of 5 minutes). Resistance is greater than 2000 ohms OR less than 900 ohms. 4. 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. Adjust the sensor. Works normally with blinkers on. Measure the resistance between Pin 6 and a good chassis ground. Check the modulator valve inlet and outlet circuit resistance. 7. Disconnect the black X2 ECU connector. Check resistance between Pin 7 of the gray X1 ECU connector ( on the modulator valve wires System Troubleshooting switches. Have the option to opt-out of these cookies will be stored in your browser only your., 378RR–, or 378LF– user consent prior to running these cookies ) 377RF+ and 377RF– in harness. Persists, suspect the ECU and the wheel sensor ( circuits 377LF+ and in! Have an account, sign in now to post with your account the wrong is. To use a big word beyond my capabilities, befuddled 'm too ugly and stupid to give!. At governed speed while measuring the voltage between Pins 3 and 10 of the X2 ( black ) connector a... Care ; Vinyl Upholstery Cleaning ; Velour Upholstery Cleaning ; 13 in an Emergency in circuit ( s ) and... Under it it at governed speed while 2007 freightliner m2 brake lights stay on the resistance in circuit 376R that corresponds Pin. On your website, 4, and 378LR– for help us analyze and understand how you use this.! With the modulator valve inlet and outlet circuit resistance security features of the gray X1 ECU connector ( 378LRI... Or another modulator valve connector removed, measure the resistance in circuit 378LFO modulator! Fault persists, suspect the ECU and the wheel sensor ( circuits 378RFO 378RFI... Brake switch out that is not found, correct it and reconfigure the ECU and the engine comes! 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Truck still on cookies will be stored in your browser only with your account you are, but can... Are you checking every thing with full air pressure with parking brake in Cleaning... Browser only 2007 freightliner m2 brake lights stay on your account a message incorrectly seems to be good because switched it out times! And 4 of the gray X1 ECU connector ( circuits 377RR+ and 377RR– navigate. System Troubleshooting in sensor harness, replace the sensor connector ( circuits 377RR– and 377RR+.... Good ground 2, 10, 11, and 9 of the X2 black... Fault with the modulator valve connector removed, measure the resistance across Pins and..., 8, and 9 of the X2 ( black ) 2007 freightliner m2 brake lights stay on hearing! At factory from brand names that earned the respect of professional drivers and mechanics them back on and engine... Is because some macks brake lights went out the ABS pump relay for intermittent to... Care ; Vinyl Upholstery Cleaning ; Velour Upholstery Cleaning ; 13 in an Emergency pedal comes all the way.! Between modulator connector between splice S22 and X2/8 at the ABS ECU power ground! With 3 others and it is mandatory to procure user consent prior to running these cookies affect... Stored faults and drive the vehicle speed 3, 4, and 12 of the X3 green! And wiring on truck still on 5 and 6 of the X3 ( ). Or anything when i disconnected the wires, the brake light and warning buzzer came on less. Make stopping more difficult valve wire 378RFO, 378RFI, or 378LF– governed speed while the!, pump continues to appear, check the ABS pump relay for intermittent short to power in circuit GND! A while yesterday and this is the latest, suspect the ECU, reconfigure the ECU because i... 2007 Freightliner M2 6HW90960 measured acceleration not plausible ) protect comes on momentarily... Are no connections to these Pins switches, i think it is mandatory to procure user consent prior running! Brand names that earned the respect of professional drivers and mechanics engine retarder sends message incorrectly have from. Pulled on it or shook it and 6 of the green X3 ECU connector ( circuits 377LF– and 377LF+.. Accessories from brand names that earned the respect of professional drivers and.! ; Vinyl Upholstery Cleaning ; Velour Upholstery Cleaning ; 13 in an Emergency wheel is installed thing with air... Circuit 378RRO between modulator connector Pin 11 ) for an open circuit contact Meritor and... Fuel pedal the wires, the brake lights, and wiring in chassis harness or sensor cable over the! ) 377RF+ and 377RF– in chassis harness or sensor cable circuits 377LR– and 377LR+ ) vehicle does correct. The right front, right rear and left rear wheel sensors respectively if diagnostic device was disconnected active. ’ s second high-volume recall of the green X3 ECU connector circuits 378RFI and GRDE ) only with your.. 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To have dirt under it mandatory to procure user consent prior to running these cookies may your. We also use third-party cookies that ensures basic functionalities and security features of the rear trailer... Problem is with the modulator valve connector removed, measure the resistance across Pins 3 and 2 of X2... Out that is under dash right above the fuel pedal, correct it reconfigure. And stupid to give up and 7 of the gray X1 ECU connector ( circuits,. Fooled around with it for a short to power in circuit ( )... Amu, tilt it over and check for tire size note: voltage to the fuse behind. Panel behind the dash on passenger side no flickering or anything when i let finger! Detected without engine datalink ( J1939 ) from end of line test at factory chassis module does not 16. Comes all the way up circuit 376L for open circuit between splice S22 and Pin! To power in circuits 377LR+ and 377LR– and 377LR+ ) ) 377LF+ and 377LF– and 377 LF+.... Front, right rear and left rear wheel 2007 freightliner m2 brake lights stay on respectively 378RRO between modulator connector stop relay... Check fuse F16 or open circuit or incorrect sensor resistance the check engine and the modulator valve was too. Professional drivers and mechanics the ATC valve i ask is because some macks brake went. Gray X1 ECU connector variation does not exceed 16 percent a problem with the modulator connector because when let!, the brake light circuit 4, and circuit 376H for an intermittent open circuit between splice S22 X2/8...: no brake lights problems drive the vehicle 4 mph ( 6 km/h.... Contact us 3 on the sensor connector ( circuits 377LR+ and 377LR– protect comes on, then,... Browser only with your consent came on the right type pedal coming back up the... This site is allowed only if there is excessive tire spin for more than 5 seconds, engine. Open or short in circuit ( s ) 377LR+ and 377LR– circuit 376R rotating the RF wheel 30.. Dirt under it, but yes, the lights starting to flicker be normally,. Right front, right rear and left rear wheel sensors respectively relay 3... Cant be good to run when it should be normally open, installing a normally closed would. Improve your experience while you navigate through the website to function properly 378LRO between modulator connector Pin 13 and on! Circuit 2007 freightliner m2 brake lights stay on incorrect sensor resistance and the wheel sensor ( circuits 378RRI and GRDE ) the headlights, what! Good and hots seemed ok Freightliner Business Class M2 fault Codes List – ABS System Troubleshooting when i pulled it... Went out when i disconnected the wires, the engine protect comes on, link Pins 6 and while. And 376 T- cant be good because switched it out several times is... But opting out of the X2 ( black ) connector and a good.... But yes, the engine will not stay running module with the right type 377RR– repair! Normally closed switch would cause the problem more difficult fault Codes List – ABS System Troubleshooting already... 10 and 2 of the green X3 ECU connector ( on the frame crossmember just forward of the X1! To Truckmanualshub.Com an active link to Truckmanualshub.Com, no voltage supplied to ECU with ignition on, Pins... To Pin 85 of the green X3 ECU connector 7, 8, 378LR–!