ABS/TCS - ABS Lamp ON/Service Stability Message/DTC's
TECHNICALBulletin No.: 08-05-25-007
Date: October 13, 2008
Subject:
Hybrid Two-Mode ABS Traction Control, StabiliTrak Lights And/Or Service Brake System Message On With DTCs C0277, C0278.00, C0161, C129C, C129F, C12B1 or C0110.61 and C12E8 (Reprogram EBCM and ECM, Then Perform EBCM Relearn)
Models
Condition
Some customers may comment that the ABS lamp is illuminated followed by a "Service Stability Message" and/or "Service Brake System Message" displayed in the Drivers Information Center.
During diagnosis, the technician may find any or all of the Electronic Brake Control Module (EBCM) codes set as shown above.
Correction
Important:
Verify that the 12-volt battery has a battery charge of 12 to 16 volts. The battery must be able to maintain a charge during the programming. Only use approved Midtronics PSC-550 charger/maintainer or equivalent to maintain proper battery voltage during programming. The J2534 MDI will reprogram the modules in less time than the Tech 2(R) scan tool.
Monitor the master cylinder pressure sensor parameter, reprogram the EBCM and ECM, then perform the EBCM Relearn using the procedure below.
1. Record all the DTCs and sub codes on the repair order.
2. Using the Tech 2(R), monitor the master cylinder pressure sensor parameter in the EBCM data list with your foot off the brake pedal. The reading should be at zero, but may rapidly flicker +/- 15 psi ( +/- 100 kPa ) which is normal. Any other readings are considered abnormal and you should check the master cylinder pressure sensor or circuit information in SI.
Note:
Select "Hybrid Only" for Gross Vehicle Weight.
3. After the master cylinder pressure sensor is reading correctly, Program the EBCM and the ECM with the latest calibrations listed in TIS2WEB by selecting the SEQ "EBCM/HCP/ECM/TCM/BECM Sequential Programming".
4. Clear all the codes from the modules.
5. Perform the EBCM Relearn Procedure below.
EBCM Relearn Procedure
Note:
The vehicle must be at least 32°F (0 C°) or warmer before performing the set up procedures below. Use a contact thermometer or an infrared temperature gun to measure the temperature.
Using the Tech 2(R) scan tool, perform the EBCM Relearn using the steps below:
1. Select Diagnostics.
2. Build the appropriate vehicle information.
3. Select Chassis.
4. Select if the vehicle is equipped with Magnetic Ride Control Suspension Package (RPO Z95).
5. Select Electronic Brake Control Module (EBCM).
6. Select Module Setup as shown.
Note:
The Acceleration Sensor Reset (Yaw/Lat Sensor) and the BMC Primary Piston Position Relearn that is listed under module setup will not need to be performed because the two relearns are being performed during the EBCM Relearn.
7. Select the EBCM Relearn.
8. Start the engine with the transmission in the Park position. Do Not apply the brake pedal during the Relearn.
9. The Tech 2(R) screen will have a soft key labeled "RESET". Press the Tech 2(R) soft key and the screen will read " *Procedure in Progress*" for 20-25 seconds.
1. The screen should read "Process Complete" as shown. If the Relearn fails, you need to clear all codes and repeat the entire EBCM Relearn Procedure.
2. At this point the relearn is not completed; you need to WAIT an additional 50 seconds without depressing the brake pedal.
3. Clear all the DTCs from the PCM and the EBCM.
4. Turn the ignition key to the "OFF" position. Open the driver's door and wait one minute before starting the vehicle. This will disable the retained accessory power allowing the High Speed GMLAN Serial Data Bus to go to sleep and write the data to the Electrically Erasable Programmable Read Only Memory (EEPROM) in the EBCM.
10. Start the vehicle and drive up to 32 km/h (20 mph), then perform a brake stop.
11. Park the vehicle and place the transmission in the Park position.
12. Turn the ignition key to the "OFF" position for one minute.
13. Clear all the codes from all of the modules.
14. Drive the vehicle again and perform another brake stop.
Important:
If DTC C0561 is present, cycle the ignition key to the "OFF" position for one minute. Then start the vehicle and clear the DTC while the vehicle is running.
15. Verify that the condition has been corrected and that all the codes have been cleared.
Warranty Information
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