C1211

ABS Warning Indicator Schematic:

DTC C1211 ABS Warning Indicator Circuit Malfunction (Part 1 Of 3):

DTC C1211 ABS Warning Indicator Circuit Malfunction (Part 2 Of 3):

CIRCUIT DESCRIPTION
This DTC checks the state of the ABS warning indicator to identify a situation in which the driver could not be warned of a system malfunction by the ABS warning indicator, or the ABS warning indicator is always on. Due to an integral lamp driver module within the instrument panel cluster, the EBCM must provide a ground to turn the amber ABS warning indicator off. Because of the circuitry in the integral Lamp Driver Module (LDM), only external malfunctions can be detected. As a result, the integral LDM itself is not diagnosable, only the control line to the EBCM can be diagnosed. In the event of an open or short to voltage in the control line (CKT 867), the ABS warning indicator will be on at all times, due to the loss of ground at the integral LDM input. If the control line is shorted to ground, the ABS warning indicator is kept off, due to the integral LDM input being grounded.

CONDITIONS FOR SETTING THE DIAGNOSTIC TROUBLE CODE (DTC)
DTC C1211 can be set only during the three second bulb check or when the amber ABS warning indicator is commanded on. If the EBCM cannot control the ABS warning indicator for two seconds, a malfunction exists.

ACTION TAKEN WHEN THE DTC SETS
A malfunction DTC is stored, however, ABS is not disabled.

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 lamp test function of the scan tool may be used to command the lamp on while looking for an intermittent malfunction in the ABS warning indicator circuitry. 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 the scan tool manual. 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.