C1237

Circuit Description
The EBCM monitors the switched battery voltage level available for ABS/ETS operation. If the voltage level is too high, damage may result in the system. When the EBCM detects a high voltage condition, the EBCM turns OFF the system relay which removes battery positive voltage from the solenoid valves and the pump motor.

Conditions for Running the DTC
The vehicle speed is greater than 8 km/inch (5 mph).

Conditions for Setting the DTC
The switched battery voltage is greater than 17 volts for 0.72 seconds.

Action Taken When the DTC Sets
The following actions occur:
^ The EBCM disables the ABS for the duration of the ignition cycle.
^ The ABS warning indicator turns ON.
^ A malfunction DTC is stored.

Conditions for Clearing the DTC
^ The condition for setting the DTC is no longer present and the scan tool Clear DTCs function is used.
^ The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Diagnostic Aids
The following are possible causes of the DTC:
^ A charging system malfunction.
^ An internal EBCM malfunction.

Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. This step uses the scan tool to check the battery positive voltage circuit to the EBCM.
3. This step checks the battery positive voltage supply circuit.