C0286

CIRCUIT DESCRIPTION
The amber ANTILOCK indicator lamp is supplied ignition voltage through the GAUGE fuse. The indicator is normally on unless the Electronic Brake Control Module (EBCM) switches the indicator off (normal mode). This logic ensures that the indicator will be illuminated if there is an open in CKT 867 or a faulty Electronic Brake Control Module (EBCM).

CONDITIONS FOR SETTING THE DTC
^ High voltage is present on the ABS indicator lamp control circuit when low voltage is expected (lamp is turned on)
^ Anything that keeps the ABS indicator lamp circuit high when the lamp is expected to be on

ACTION TAKEN WHEN THE DTC SETS
^ The ABS is not disabled.
^ The EBCM will use the red BRAKE warning lamp to alert the driver of an ABS malfunction.

CONDITIONS FOR CLEARING THE DTC
^ Repair the conditions responsible for setting the DTC
^ Use the Scan Tool Clear Diagnostic Trouble Codes (DTCs) function

DIAGNOSTIC AIDS
DTC C0086 typically sets because of a shorted ABS indicator lamp. Yet DTC C0086 can also set because of a short to voltage in the wiring between the ABS indicator lamp and the EBCM.

TEST DESCRIPTION
The numbers below refer to the steps in the diagnostic table:
2. This step checks for normal operation of the ABS indicator lamp.
3. This step turns off the ABS indicator lamp with a J36169-A.