Circuit Description
The electronic brake control module (EBCM) is wired to the ignition 1 voltage circuit to indicate the ignition ON/OFF state. The EBCM monitors this voltage to ensure the voltage remains within an acceptable operating range.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC C0900 Device Voltage High
Conditions for Running the DTC
| • | The ignition is ON. |
| • | The vehicle speed is greater than 20 km/h (13 mph). |
Conditions for Setting the DTC
The EBCM samples the ignition voltage every 7 milliseconds. When ignition voltage is detected as too high, this DTC sets immediately.
Action Taken When the DTC Sets
If equipped, the following actions occur:
| • | The EBCM disables the Antilock Brake System (ABS)/Traction Control System (TCS). |
| • | The ABS indicator turns ON. |
| • | The traction off indicator turns ON. |
Conditions for Clearing the DTC
The conditions for setting the DTC are no longer present and you use the scan tool Clear DTCs function.
Diagnostic Aids
Several charging system related malfunctions may cause this DTC to set intermittently. Refer to the Engine Electrical section for further diagnostic aids.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Antilock Brake System Schematics | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |
2 |
Does the DTC set? | Go to Step 3 | Go to Diagnostic Aids |
3 | Replace the electronic brake control module (EBCM). Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 4 | -- |
4 |
Does the DTC reset? | Go to Step 3 | System OK |
