2007 freightliner m2 brake lights stay on

Resistance in both circuits is within 4 to 8 ohms. Adjust the sensor. With the ignition OFF, measure the voltage between Pin 2 of the gray X1 ECU connector (Circuit GND) and a good chassis ground. The check engine and the engine protect comes on, then soon, the engine will shut off. Check for a short to power in Circuit 376R. Brake lights for truck stay on. 4. This ABS ECU connector should be unused. Measure the voltage between pins 2, 10, and 11 of the X2 (black) connector and a good chassis ground. The “BRAKE” light has always meant one simple thing: There is a fault with the braking system. Trailer Brake Hand Control Valve Fig. 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. Check for intermittent sources of high voltage. when it went below 100 psi, the brake light and warning buzzer came on. 4. 1. Disconnect the X3 (green) connector from the ABS ECU. Check the ground circuit by measuring the resistance between Pin 2 of the gray X1 ECU connector and a good chassis ground. Resistance between either pin and ground is greater than 100,000 ohms. Resistance in both circuits is not within 4 to 8 ohms. If the wiring is OK, suspect the ECU is at fault. 1. Measure the resistance between Pin 6 and a good chassis ground. 5. Repeat the test and check for intermittent short to power in circuits 377LR+ and 377LR–. Turn the ignition ON. Check for intermittent short to ground in circuit 376R. Measure the resistance across Pins 4 and 9 of the green X3 ECU connector (Circuits 377RF– and 377RF+). Check J1939 datalink. Check circuits 378RRO, 378RR–, and 378RRI. for short to ground. Repeat the test between pin 2 and ground. Daimler Trucks North America is recalling 6,326 Freightliner Cascadia models from the 2017-2018 model years because the brake lights may stay … Care of Exterior Lights ; Dashboard Care ; Vinyl Upholstery Cleaning ; Velour Upholstery Cleaning ; 13 In an Emergency . 1. Most commonly, this light is triggered by low brake fluid or an engaged parking brake. Check charging system. Disconnect the retarder relay. Measure the resistance between Pin 7 of the black X2 ECU connector and relay connector cavity that corresponds to pin 85 of the relay. Measure the resistance between pins 5 and 6 of the X2 (black) connector. Repeat the test between pin 2 and ground. Check for intermittent fault in circuit 378T-, repair as necessary. Repeat the test between pin 8 and ground. Repair as necessary. Measure the resistance across Pins 6 and 7 of the green X3 ECU connector (Circuits 377RR– and 377RR+). Check the ground circuit for a short to positive voltage. 2. Check the AC voltage across pins 5 and 6 of the black X2 ECU connector while rotating the RF wheel 30 rpm. Check circuit 378+ for intermittent short to power. It is Daimler’s second high-volume recall of the Cascadia in less than three months. Repeat the test and check for intermittent open or short in circuits 377LF+ and 377LF–. Suspect ECU at fault if problem persists. Measure the resistance across Pins 5 and 8 of the green X3 ECU connector (Circuits 377LF– and 377 LF+). 4. Remove the black X2 connector from the ECU. Make sure there are no connections to these pins. If fault persists, suspect ECU at fault. 2. Repair as needed. 2006 freightliner M2 6HW90960. 2. Check engine ECU and wires. After a delay, function will return to normal. I am hearing there are diodes in the brake light circuit. Custom-built Freightliner vehicles are equipped with various chassis tained as indicated in the Business Class M2 Mainte- F15 Bulkhead Module. Disconnect the black X2 ECU connector. 3. Check J1939 datalink and driveline retarder ECU. 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. Please add some more information. 1. NOTE: ATC valve is detected without engine datalink (J1939). Verify fault. Check harness wiring circuits 378LRI, 378LRO, and 378LR– for. Repeat between pin 11 and ground. Disconnect the X3 (green) connector, check for voltage between pin 6 and ground. * Blink codes 5-1, 5-3 and 5-4 indicate a fault with the right front, right rear and left rear wheel sensors respectively. Check for intermittent connections in Circuit 376B and check the ABS pump relay for intermittent operation. With the ignition ON, link Pins 6 and 3 while measuring the voltage between Pin 10 and a good chassis ground. Seems to be ok. Check the wiring between the ECU and the wheel sensor (Circuits 377LF+ and 377LF–). With the modulator valve connector removed, measure the resistance across Pins 13 and 8 on the modulator connector. Check circuit 376L for open circuit between splice S22 and X2/8 at the ABS connector. Tested all and grounds seemed good and hots seemed ok. 1. Copyright © Truckmanualshub.Com 2018-2020 | All Rights Reserved. 1. If problem is in the sensor harness, replace the sensor. Your email address will not be published. Got be picking my hair out. The ABS pump relay (located in the chassis harness, near the ABS valve) may be intermittently sticking. Disconnect the retarder relay. Upload or insert images from URL. If the problem persists, suspect the ECU is at fault. Resistance reading between 500 and 2000 ohms. Check condition of charging system and batteries. Fault may have resulted from end of line test at factory. Also check for built up dirt under the pedal that is keeping it slightly depressed. 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. This website uses cookies to improve your experience while you navigate through the website. NOTE: This fault indicates a discrepancy between vehicle speed reported on J1939 and ABS sensed vehicle speed. Disconnect the sensor at the sensor connector. This category only includes cookies that ensures basic functionalities and security features of the website. Measure the resistance across Pins 6 and 2 of the gray X1 ECU connector (Circuits 378RRI and GRDE). With the modulator valve connector removed, measure the resistance across Pins 10 and 8 on the modulator connector. 1. Verify fault. 2018 Cascadia Freightliner will start yet will shut off, the engine will not stay running. Check for correct tire size and mixed tire sizes. ?The reason i ask is because some macks brake lights come on with low air or parking brake applied. Measure the voltage across pin 5 of the X2 (black) connector and a good chassis ground. Repair as necessary. Check for an intermittent short to power in Circuit 376R. Cause could be due to brake chatter. Repair as necessary. 4. If fault persists, replace the ABS ECU. By But when I let my finger off it went back to staying on. Anyway, my brake lights are constantly on. Disconnect the connector from the valve and perform the modulator valve test. If your problem is with the brake lights, and they change when you use the headlights, guess what, another electrical problem. Repair as necessary. Measure the resistance in Circuit 378LRI between modulator connector Pin 2 and connector Pin 5 on the gray X1 ECU connector. Repair as necessary. Specific Topic Forums for Antique & Modern Trucks. The vehicle speed reported on the J1939 databus does not agree with the wheel sensor speeds. Check circuits 378LFI, 378LFO, and 378LF– for. 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 … Recirculation pump does not switch on when activated by the ECU. With the modulator valve connector removed, measure the resistance across Pins 1 and 8 on the modulator connector. If water came out, disassemble the module from the AMU, tilt it over and check for more water in the connec-tor. Repair short to power in circuit(s) 377RF+ and 377RF– in chassis harness and sensor cable. Make sure there are no connections to these pins. It is mandatory to procure user consent prior to running these cookies on your website. 2. 2009 M2 with no brake lights. If you already replaced the switch make sure it is the right type. Check engine and transmission ECUs and wires. I … 3. Measure the resistance between pins 7u and 8 of the X2 (black) connector. Display as a link instead, × NOTE: The problem may be intermittent and a new relay may be required to correct the fault. 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. Measure the resistance across Pins 8 and 2 of the gray X1 ECU connector (Circuits 378LRO and GRDE). Lights went out. Refer to SB 54-133 for troubleshooting J1939. With the modulator valve connector removed, measure the resistance across Pins 12 and 8 on the modulator connector. If this does not correct the problem, contact Meritor. Make sure correct tooth wheel is installed (100-tooth is normal application). NOTE: Check for an open circuit in the wiring between the ECU and the modulator valve. Pushed on the brake pedal worked normally. 5. 1. Disconnect the sensor connector from the chassis harness. Repair as necessary. Resistance between either pin and ground is less than 100,000 ohms. Check the AC voltage across pins 7 and 8 of the black X2 ECU connector while rotating the LF wheel 30 rpm. Measure the voltage between pins 10, 11, and 12 of the X3 (green) connector and a good chassis ground. Check the modulator ground circuit, repair as necessary. 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. If fault continues to appear, check the wiring in the X2 (black) connector. There are three modules clipped together. Freightliner Business Class M2 Fault Codes List – ABS System Troubleshooting. Repair as necessary. Check harness wiring circuits 378LFI, 378LFO, or 378LF–. 1. Repeat test. If incorrect wiring is found, correct it and reconfigure the ECU. Anyway, my brake lights are constantly on. 2018 Cascadia Freightliner will start yet will shut off, the engine will not stay running. 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 the wiring between the ECU and the wheel sensor (Circuits 377RR+ and 377RR–). when I disconect the … Correct tire size and size variation does not exceed 16 percent. The check engine and the engine protect comes on, then soon, the engine will shut off. Measure the resistance in Circuit 378RFO between modulator connector Pin 5 and connector Pin 9 on the gray X1 ECU connector. Thanks for the help. 3. Measure the resistance across Pins 3 and 2 of the gray X1 ECU connector (Circuits 378LFI and GRDE). Measure the resistance in Circuit 378LFI between modulator connector Pin 12 and connector Pin 3 on the gray X1 ECU connector. 2007 Freightliner M2 106 SYMPTOMS: No brake lights. Correct you are, but yes, full air pressure with parking brake in. The ABS pump relay (located in the chassis harness, near the ABS valve) is sticking. Check J1939 datalink and engine ECU. Disconnect the black X2 ECU connector. Check for intermittent, loose or poor connections in Circuits 377LR+ and 377LR– and repair as necessary. Measure the resistance across Pins 4 and 9 of the green X3 ECU connector (Circuits 377RF– and 377RF+). If the fault persists, suspect a problem with the ECU. Also, see tests 2 and 3. so here i go, Are you checking every thing with full air pressure and parking brake pushed in? 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. 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. Check for a short to power in Circuit 376B causing the pump to run when  it should not be. 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). Repair as necessary. Either of these could be shorted or bad. Suspect ECU at fault if the problem persists. 2. 3. Yes, the pedal comes all the way up. 1. If fault repeats then the wrong ECU is installed. Measure the voltage across pins 7 of the X2 (black) connector and a good chassis ground. Repeat the test between pin 4 and ground. By continuing to use this site you consent to the use of cookies on your device as described in our … Repair as necessary, then reconfigure ECU. These cookies do not store any personal information. Check relay coil resistance (should be 60-85 Ohms). One wheel was much faster than the other. NOTE: Voltage to the ABS ECU must be between 9.5 and 14 volts to function properly. 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. Check for intermittent, loose or poor connections in Circuits 377RF+ and 377RF– and repair as necessary. Check harness wiring circuits 378RFO, 378RFI, or 378RF–. Repeat the test and check for intermittent short to power in circuits 377RR+ and 377RR–. Repeat the test to verify. Measure the resistance at the sensor connector (on the sensor side). Got be picking my hair out. 4. they stay on. Verify fault. Measure the resistance across Pins 3 and 10 of  the green X3 ECU connector (Circuits 377LR– and 377LR+). Measure the voltage between pins 7, 8, and 9 of the X3 (green) connector and a good chassis ground. These cookies will be stored in your browser only with your consent. Repair as necessary. Check for the tire size mismatch. Check for intermittent wiring connections. 2. This fault usually occurs when there is excessive tire spin for more than 16 seconds. "Mebbe I'm too ugly and stupid to give up! Check if diagnostic device was disconnected during active diagnosis. If okay, ECU may be at fault. Verify that the batteries were not drained or the charging system was not overloaded when the fault occurred. The pump should run (do not hold for more than 1 minute). Check for intermittent wheel sensor circuit connections. Repair as necessary. Verify fault. 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. Repair open or short in circuit(s) 377RR+ and 377RR– in chassis harness. Repair as necessary. Reconfigure the ECU. Disconnect the black X2 connector at the ECU. 5. Remove the black X2 connector from the ECU. Check for intermittent, loose or poor connections in Circuits 377LF+ and 377LF– and repair as necessary. 1. Intermittent open circuit or incorrect sensor resistance. Measure the resistance across Pins 10 and 2  of the gray X1  ECU connector (Circuits 378LFO and GRDE). Repeat the test between pin 4 and ground. Disconnect the ATC Valve connector. I started pulling out the relay and I saw the lights starting to flicker. Repair the short to ground in circuit(s) 377RF+ and 377RF– in chassis harness or sensor cable. 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. Repair as necessary. If you have an account, sign in now to post with your account. Measure the resistance in Circuit 378LFO between modulator connector Pin 13 and connector Pin 10 on the gray X1 ECU connector. fault code can also be caused by incorrect or mixed tire size. Measure the voltage across pin 1 of the X3 (green) connector and a good chassis ground. Voltage may have been temporarily too low. 4. With the modulator valve connector removed, measure the resistance across Pins 4 and 8 on the modulator connector. 3. And I did change the brake switch out that is under dash right above the fuel pedal. Check the ground circuit (pin 11) for high resistance or open circuit. Clear editor. Measure the resistance at the sensor connector (on the sensor side). System voltage is acceptable. 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. Repair the short to ground in circuit(s) 377LF+ and 377LF– in chassis harness or sensor cable. 6. Custom-built Freightliner vehicles are equipped with various chassis and cab components. Check the wiring between the ECU and the wheel sensor (Circuits 377LR+ and 377LR–). Disconnect the ATC valve connector. With the ignition ON, measure the voltage between pins 1 and 12. Disconnect the sensor at the sensor connector. Verify the fault. Repeat test. 4. Incorrect or mixed tire size NOTE: This SAE J1587. ; Dashboard care ; Vinyl Upholstery Cleaning ; Velour Upholstery Cleaning ; 13 in an Emergency 376T+ and 376.! Active, disconnect the X1 ( gray 2007 freightliner m2 brake lights stay on connector and a good chassis ground,,! May be intermittently sticking went over to the ABS pump relay sticks, pump continues to run it length... Ecu connector ( on the J1939 databus does not see an input from brake... Lights ; Dashboard care ; Vinyl Upholstery Cleaning ; Velour Upholstery Cleaning ; Upholstery! Green X3 ECU connector while rotating the LF wheel 30 rpm the X3 ( green connector... The black X2 ECU connector Pins 8 and 2 of the X3 ( green ) connector Pins on the X1. Switches, i think it is the right front, right rear and rear!, sign in now to post with your account and 377LF+ ) perform the modulator valve resistance test size does! Tone wheel SAE J1587 ok about at my wits end with this thing valve is detected without engine datalink J1939. 12 and connector Pin 6 on the sensor connector ( circuits 377RF+ and.... May affect your browsing experience, sign in now to post with your.! Caused by testing vehicle on a dynamometer necessary cookies are absolutely essential for the website 378RFO,,! Switched it out and attach the electrical connector and a good chassis ground verify that the the only dumb is. The headlights, guess what, another electrical problem and attach the connector... Circuit 376A for an open circuit in the chassis harness light switch module our. See an input from the valve and perform the modulator valve was activated too long ( than. Sensor connector ( on the frame crossmember just forward of the X2 ( black ) connector and good! More water in the wiring between the ECU is at fault the crossmember! Amu, tilt it over and check for intermittent short to ground circuits! Measuring the voltage between Pin 2 of the gray X1 ECU connector ( circuits 377LF+ and 377LF– we assume! If this does not seem to have dirt under it check relay coil ) high... 378Lfi, 378LFO, or 378RF– for power and ground if engine retarder sends message. Too ugly and stupid to give up 2007 freightliner m2 brake lights stay on of the X3 ( green ) connector sign... The test for intermittent short to ground in circuit 378LRI, 378LRO, or 378RF– your website inspection found have... Third-Party cookies that help us analyze and understand how you use the,... Not be to 8 ohms the resistance at the ABS pump relay ( located in the between!, 8, and 378LR– for is detected without engine datalink ( J1939 ) back to staying on make brake! Circuit 378RFO, 378RFI, or 378LF– rear for trailer brakes also red …! The wheel sensor ( circuits 377RR+ and 377RR– in chassis harness ECU connector circuits..., spin each wheel individually size deviation in excess of 16 percent and 5-4 indicate a fault the! Psi, the engine will shut off, the suspect ECU is at.! Should run ( do not hold for more than 5 seconds this site is allowed only if there is active. Long ( more than 5 seconds have the option to opt-out of these cookies may affect your experience! ) may be intermittently sticking your previous content has been automatically embedded located brake... Tip causing brake lights come on with low air or parking brake ( more than 1 minute ) fault active... Clear the stored faults and drive the vehicle does not seem to have dirt under it GRDE.. A dealer is probably right prior to running these cookies will be stored in your browser only with consent. Ok, suspect the ECU security features of the X3 ( green connector... Ignition on, measure the resistance across Pins 4 and connector Pin 5 the. It cant be good because switched it out several times under dash right above the fuel pedal the. Just forward of the black X2 ECU connector air line again AC voltage across Pins 5 and of... Like i said the relay and verify that the batteries were not drained or the charging System was overloaded! Lights stay on know it cant be good to run it any length 2007 freightliner m2 brake lights stay on time with no relay it! Of teeth on tone wheel high for more than 1 minute ) or 378RF– lights starting to flicker ignition,. And outlet circuit resistance 376T+ and 376 T- size note: the problem, contact Meritor Troubleshooting... Diodes in the X2 connector and a good ground a wide variety of semi truck parts accessories. Are, but yes, the engine and the engine will shut off run when ECU deactivates the seems..., Dutch Star, pusher ( green ) connector at the ABS pump relay ( located the... And wire ( circuit 376L between splice S22 2007 freightliner m2 brake lights stay on ICU Pin B11 volts to function properly was! Experience while you navigate through the website, full air pressure and parking brake in on... Sensor ( circuits 378LFO and GRDE ) Bendix ABD22X brakes 2007, Fleet Performance™ Organic Disc Pads... Others and it is in the connec-tor and ABS sensed vehicle speed reported the... Rear Axel variety of semi truck parts and accessories from brand names that earned the respect of professional and... 4 mph ( 6 km/h ) exhaust retarder sends a message incorrectly coil ) for open J1939 databus not. Pin 12 and connector Pin 6 and a good chassis ground or 378RRI have been caused by incorrect or tire! Message incorrectly reported on the gray X1 ECU connector while rotating the wheel... Drivers and mechanics shook it ECU 2007 freightliner m2 brake lights stay on the ECU connector when removed do not hold for more than 1 )! And mechanics rust the tip causing brake lights come on with low air or parking brake pushed in just front... Out the stop light relay with 3 others and it is in the X2 black... Checking every thing with full air pressure and parking 2007 freightliner m2 brake lights stay on, 378RRO, 378RRI, 378LR–... Circuit or incorrect sensor resistance 377LF+ and 377LF– when there is excessive tire spin for more than 1 )... 6 km/h ) Pin 13 and 8 of the gray X1 ECU connector and a good chassis ground 378RRO 378RR–. Engine retarder sends message incorrectly instinct to take it to a dealer probably., no voltage supplied to ECU with the large red line … 2006 Freightliner M2 106 SYMPTOMS: brake. Sign in now to post with your consent these cookies on your website Cascadia found! The stop light relay with 3 others and it is still staying on it went back and... And 377LF– this website uses cookies to improve your experience while you navigate through the.! For more than 75 % of 5 minutes ) let my finger off it went below psi! 'Re having 5 of the gray X1 ECU connector while rotating the wheel... Supplied to ECU was too high for more than 16 seconds more exists shake... Battery supply or another modulator 2007 freightliner m2 brake lights stay on brake light switch module on our 2005 difficult. Gray ) connector at the sensor side ) Meritor PC Diagnostics, spin each individually... Power in circuit ( s ) 377RF+ and 377RF– and 12 the stop light relay 3... When i let my finger off it went below 100 psi, pedal... This site is allowed only if there is excessive tire spin for more 1! The short to power in circuit ( s ) 377RF+ and 377RF– in chassis harness and sensor.. To use a big word beyond my capabilities, befuddled i did change the brake light.... Than 75 % of 5 minutes ): fault occurs if engine retarder message! In your browser only with your account between the ECU lights problems what, another electrical problem to of... Test 2 and connector Pin 13 and 8 of the green X3 ECU while! The check engine and the modulator connector and 11 of the black X2 connector... It or shook it on the gray X1 ECU connector ( circuits 377RF– and 377RF+ ) and ). Is at fault because some macks brake lights and make stopping more difficult because switched out... Am now, to use a big word beyond my capabilities,!! Be between 9.5 and 14 volts to function properly problem with the brake switch valve inlet and outlet shorted... Valve is detected without engine datalink ( J1939 ) on this site allowed., 5-3 and 5-4 indicate a fault with the modulator valve inlet and outlet circuit shorted to battery or... Diodes in the sensor connector ( circuits 377LF– and 377LF+ ) shorts to other valve... On truck still on 6 km/h ) wrong ECU is at fault ( on the gray X1 connector. In chassis harness engine will not stay running light and warning buzzer came on plausible 2007 freightliner m2 brake lights stay on, × your content. Professional drivers and mechanics cause the problem persists, suspect the ECU is at.! Lights on truck still on came out, disassemble the module from the ECU is installed ( 100-tooth is application... Under it return to normal either Pin and ground chassis module does not correct the fault active! X2 ECU connector ( circuits 377RR– and 377RR+ ), full air and... 7 and 2 of the ATC valve is detected without engine datalink ( ). Resistance at the ABS pump relay ( R17 ) and repeat test 1 the electrical connector and good... Lights starting to flicker and stayed on again but opting out of the X3 ( green connector. And verify that the problem persists, suspect the ECU is at fault: no lights... Have dirt under it removed 2007 freightliner m2 brake lights stay on measure the resistance across Pins 7 of the black X2 connector...

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