Test Description

The numbers below refer to the step numbers on the diagnostic table.

2: Use the scan tool in order to inspect the voltage to the EBCM.
3: Use the scan tool in order to inspect the voltage to the body control module. A high voltage value in multiple modules indicates a concern in the charging system.
4: This step verifies that the condition is still present.

DTC C1237

Step	Action	Value	Yes	No
Schematic Reference: ABS Schematics
1	Did you perform the Diagnostic System Check - Vehicle?	-	Go to Step 2	Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2	Turn OFF all of the accessories. Install a scan tool. Start the engine. Run the engine at approximately 2,000 RPM. With a scan tool, observe the Switched Battery Voltage parameter in ABS data list. Does the scan tool indicate that the voltage is greater than the specified value?	16.3 V	Go to Step 3	Go to Diagnostic Aids
3	With a scan tool, observe the Battery Voltage parameter in the body control module (BCM) data list. Does the scan tool indicate the voltage is greater than the specified value?	16.3 V	Go to Diagnostic System Check - Vehicle in Vehicle DTC Information	Go to Step 4
4	Use the scan tool in order to clear the DTCs. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text. Does the DTC reset?	-	Go to Step 5	Go to Diagnostic Aids
5	Replace the electronic brake control module (EBCM). Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the repair?	-	Go to Step 6	-
6	Use the scan tool in order to clear the DTCs. Operate the vehicle within the conditions for Running the DTC as specified in the supporting test. Does the DTC reset?	-	Go to Step 2	System OK