For 1990-2009 cars only
Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this 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
Ignition is ON.
Conditions for Setting the DTC
The system voltage is greater than 16 volts for 100 msec.
Action Taken When the DTC Sets
| • | Traction control system (TCS) and vehicle stability enhancement system (VSES) disabled for the duration of the ignition cycle. |
| • | The antilock brake system (ABS) disabled if ignition voltage exceeds 19.5 volts. |
| • | The TCS indicator turns ON. |
| • | The ABS indicator turns ON if voltage exceeds 19.5 volts. |
| • | The driver information center (DIC) displays the Service Stability System message. |
Conditions for Clearing the DTC
| • | The condition for the DTC is no longer present and the DTC is cleared with a scan tool. |
| • | The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles. |
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Antilock Brake System Connector End Views
Electrical Information Reference
Diagnostic Aids
| • | A possible cause of this DTC could be overcharging with a battery charger or jump starting. |
| • | A high voltage value in multiple modules indicates a concern in the charging system. |
Circuit/System Verification
- If the DTC is history, refer to Charging System Test
- Start the engine, record the voltage at the battery terminals. Observe the battery voltage signal parameter in the EBCM data list. Voltages should not differ by more than 1 volt.
| ⇒ | If more than 1 volt, replace the EBCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for EBCM replacement, setup and programming
