A Test system pre check

Pinpoint Test Diagram:

The anti-lock electronic control module (2C018) will turn on the Rear Anti-lock Brake System (RABS) light for 1-2 seconds after the key has been turned from the OFF to the RUN position. If RABS light prove out fails to occur, it may be caused by a burned-out bulb or an open fuse to Circuit 640 (R/Y). An open in Circuit 603 (DG) will also keep the light prove out from occurring.


Possible Contributing Base Brake Component/Vehicle Wiring Concerns
- Open fuse Circuit 640 (R/Y)
- Missing power to warning lamp (open Circuit 640 [R/Y])
- Open Circuit 603 (DG)
- Burned out RABS warning lamp bulb
- Terminal backout in the module harness connector at Pin 7
- Module connector not fully mated with anti-lock electronic control module
- Defective anti-lock electronic control module
- Open RABS ground (Circuit 530 [LG/Y])

NOTE: Use Rotunda(r) 73 digital Multimeter 105-00051 or equivalent for electrical tests.