ABS - With Traction Control

CIRCUIT DESCRIPTION
This DTC identifies an open or short to voltage between the EBCM/EBTCM and the red BRAKE warning indicator, or an open driver that does not allow the red BRAKE warning indicator to be illuminated by the EBCM/EBTCM. This will only occur if an ABS malfunction is detected that may degrade base brake operation. Because the EBCM/EBTCM is not the only device controlling the red BRAKE warning indicator (park brake indicator switch and brake fluid level indicator sensor may also turn on the red BRAKE warning indicator) a short to ground in this circuit cannot be detected.

CONDITIONS FOR SETTING THE DTC
DTC C1287 can be set during the three second bulb check and after initialization is completed. If the red BRAKE warning indicator circuit voltage is out of specification indicating an open circuit or a short to voltage, a malfunction exists.

ACTION TAKEN WHEN THE DTC SETS
A malfunction DTC is stored and ABS/ETS is not disabled. However, if the EBCM/EBTCM commands the red BRAKE warning indicator on due to an ABS malfunction that may degrade base brake operation and cannot do so, the amber ABS warning indicator will flash to indicate the serious nature of the problem.

CONDITIONS FOR CLEARING DTC
Condition for DTC is no longer present and the scan tool (CLEAR DTCs) function is used, or 100 drive cycles have passed with no DTC(s) detected.

DIAGNOSTIC AIDS
An intermittent malfunction may be caused by a poor connection, rubbed-through wire insulation, or a wire that is broken inside the insulation. The frequency of the malfunction can be checked by using the enhanced diagnostic function of the Scan Tool, as described in Scan Tool Diagnostics in this section. If a Scan Tool is not available, the parking brake handle may be lifted to verify proper indicator operation and the continuity of CKT 39. Any circuitry that is suspected of causing the intermittent complaint should be thoroughly checked for backed-out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wiring connections, or physical damage to the wiring harness.

NOTE: J 39200 test leads must be zeroed prior to making any resistance measurements. Refer to J 39200 user's manual.