For 1990-2009 cars only
Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using the diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptor
DTC C0900: Device Voltage HighCircuit/System Description
The electronic brake control module (EBCM) monitors the ignition voltage. If the voltage level is too high, damage may result in the system. When a high voltage condition is detected the EBCM turns OFF the system relay which removes battery voltage from the solenoid valves and pump motor.
Conditions for Running the DTC
The vehicle speed is greater than 8 km/h (5 mph).
Conditions for Setting the DTC
The system voltage is greater than 17 volts for 0.72 seconds.
Action Taken When the DTC Sets
| • | The EBCM disables the ABS for the duration of the ignition cycle. |
| • | The antilock brake system (ABS) indicator turns ON. |
| • | The traction control and active handling indicator turns ON. |
| • | The solenoid relay opens, removing voltage from the solenoids and pump motor. |
Conditions for Clearing the DTC
| • | The condition for the DTC is no longer present. |
| • | The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles. |
Diagnostic Aids
Test the charging system. Refer to Battery Inspection/Test and Charging System Test .
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Description and Operation
Electrical Information Reference
Scan Tool Reference
Circuit/System Testing
- Measure the voltage at the battery terminals.
- With scan tool, read the battery voltage in the EBCM data list.
- Go to Battery Inspection/Test and Charging System Test .
| ⇒ | If more than 17 volts, test the charging system. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
