C0086

ABS & Brake Pressure Warning Indicator Circuit Schematic:

DTC C0086 - Antilock Indicator Lamp Circuit Shorted To Battery:

CIRCUIT DESCRIPTION
The amber ANTILOCK indicator lamp is supplied ignition voltage through the GAUGE fuse. The output of the Electronic Brake Control Module (EBCM) will be high (battery voltage) when the lamp is off and will be low (ground) when the lamp is on. If a code C0086 sets, the EBCM will store the code in memory but will not disable the Antilock Brake System (ABS). If a code C0086 is in memory and a different fault occurs, the EBCM will turn on the red BRAKE lamp to notify the driver of a problem.

CONDITIONS FOR SETTING THE DIAGNOSTIC TROUBLE CODE (DTC)
^ High voltage on ABS indicator lamp circuit when expected to be low (lamp commanded on)
^ Anything that keeps the ABS indicator lamp circuit voltage high when the lamp is supposed to be illuminated, such as a short to voltage in circuit 867.

ACTION TAKEN WHEN THE DTC SETS
^ ABS is not disabled
^ DTC C0086 is stored in memory

DIAGNOSTIC AIDS
DTC C0086 is typically set by a shorted ANTILOCK indicator lamp, although it can be set from a short to voltage in the wiring between the lamp and the EBCM or a faulty EBCM.

TEST DESCRIPTION

NOTE: Number(s) below refer to number(s) on the diagnostic chart.

2. Observe the ANTILOCK indicator lamp operation.
3. Check for a faulty EBCM or a short to voltage in circuit 867.