For 1990-2009 cars only
Info - Electronic Brake Control Module (EBCM) Replacement
| Subject: | Electronic Brake Control Module (EBCM) Replacement |
| Models: | 1990-2000 Chevrolet and GMC Medium Duty Conventional, T-Series Tilt Cab and B7 School Bus Models |
| With 7.4L Engine (VINs B, D -- RPOs L21, LP4) or 7.2L Caterpillar® Diesel Engine (VIN C -- RPO LG5) and Hydraulic ABS Brakes |
| Built Prior to March 7, 2000 and the Following VIN Breakpoints: |
Plant | Make | VIN Breakpoint |
|---|---|---|
Janesville | Chevrolet | YJ517376 |
Janesville | GMC | XJ905114 |
This bulletin is being issued to inform technicians that when replacing the electronic brake control module (EBCM) on the above listed vehicles with the new EBCM P/N 12477736, the red (primary) brake light may illuminate.
In order to avoid a misdiagnosis of the service EBCM and to address the false illumination of the brake light, please perform the following steps:
- On the EBCM connector C1 (24 cavities), remove the plastic wire protector.
- Expose approximately 127 mm (5 in) of wire by removing the tape and wires from the plastic conduit.
- Cut the purple wire (conventional, school bus) or tan/white wire (tilt cab) in cavity 7 as close to the connector as possible.
- Apply a small amount of silicone on the end of the cut wire within the connector in order to seal out possible moisture intrusion.
- Cut the remaining wire several inches into the harness and tape.
- Install the wires back into the conduit and tape.
- Install the plastic wire protector.
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation | Description | Labor Time |
|---|---|---|
N6600 | Wiring and/or Connector, Brake System/Traction Control - Repair | 0.2 hr |
