C1237

CIRCUIT DESCRIPTION
This DTC is designed to detect high vehicle voltage levels prior to any required motor movement (initialization or ABS). If excessive voltage exists, demagnetization of the motor magnets may occur, which would eventually affect or eliminate ABS performance.

CONDITIONS FOR SETTING THE DTC
DTC C1237 can only be set if the vehicle's speed is greater than 5 km/h (3 mph). If the switched battery voltage is greater than 16 volts, a malfunction exists.

ACTION TAKEN WHEN THE DTC SETS
A malfunction DTC is stored, ABS is disabled, and the ABS indicator lamp is turned ON.

CONDITIONS FOR CLEARING THE DTC
Conditions for the malfunction are no longer present and the scan tool CLEAR DTCs function is used. One hundred ignition switch key cycles have passed with no malfunctions detected.

DIAGNOSTIC AIDS
The frequency of the malfunction can be checked by using the ENHANCED DIAGNOSTIC function of the scan tool. Any circuitry that is suspected of causing the intermittent malfunction, should be thoroughly checked for backed-out terminals, improper mating, improperly formed or damaged terminals, poor terminal to wiring connections, or physical damage to the wiring harness. Ensure the starting and charging systems are in proper working order. The battery should be fully charged and in good condition before beginning the diagnostic table.