C1287

Part 1 Of 2:

Part 2 Of 2:

Circuit Description
Diagnostic Trouble Code (DTC) C1287 identifies one of the following conditions:
- An open or short to voltage between the Electronic Brake Control Module (EBCM) and the red BRAKE warning indicator.
- An open driver that does not allow the EBCM to illuminate the red BRAKE warning indicator.
DTC C1287 will only occur if an Antilock Brake System (ABS) malfunction is detected that may degrade base brake operation.
A short to ground in the circuit cannot be detected because the EBCM is not the only device controlling the red BRAKE warning indicator. The following components may also turn on the red BRAKE warning indicator:
- The parking brake indicator switch
- The brake fluid level indicator sensor

Conditions for Setting the DTC
- This DTC can be set after vehicle speed exceeds 5 km/h (3 mph).
- A malfunction exists if the BRAKE indicator lamp circuit voltage is between 3.35 and 5.23 volts, indicating an open circuit.

Action Taken When the DTC Sets
- A malfunction DTC stores.
- The ABS does not disable.
- The amber ABS warning indicator will flash to indicate a serious problem if the following conditions occur:

Conditions for Clearing the DTC
- The condition responsible for setting the DTC no longer exists and the Scan Tool Clear DTCs function is used.
- 100 drive cycles pass with no DTCs detected. A drive cycle consists of starting the vehicle, driving the vehicle over 16 km/h (10 mph), stopping and then turning the ignition off.

Diagnostic Aids
The following conditions may cause an intermittent malfunction:
- A poor connection
- Rubbed-through wire insulation
- A broken wire inside the insulation

Use the enhanced diagnostic function of the Scan Tool in order to measure the frequency of the malfunction. Refer to the Scan Tool manual for the procedure.
Thoroughly inspect any circuitry that may cause the intermittent complaint for the following conditions:
- Backed out terminals
- Improper mating
- Broken locks
- Improperly formed or damaged terminals
- Poor terminal-to-wiring connections
- Physical damage to the wiring harness