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 00: Device Voltage High - EBCMDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
B+ | C0899 00*, C0899 03** | C0899 00*, C0899 03** | -- | -- |
Ground | -- | C0899 00*, C0899 03** | -- | -- |
* W/O JL4 ** JL4 | ||||
Typical Scan Tool Data
Circuit | Short to Ground | Open | Short to Voltage |
|---|---|---|---|
Operating Conditions: Ignition ON, engine OFF. Parameter Normal Value: 12.6 Volts | |||
B+ | 0.0 Volts* | 0.0 Volts* | 12.6 Volts |
*The scan tool will not communicate with the EBCM if there is 0 Volts on the circuit. | |||
Circuit/System Description
The electronic brake control module (EBCM) monitors the battery positive (B+) voltage level available for system operation. A high or low voltage condition prevents the system from operating properly, and may cause damage to the system.
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
The battery voltage is greater than 16 V for 100 msec.
Action Taken When the DTC Sets
| • | The traction control system (TCS) and vehicle stability enhancement system (VSES) are disabled for the duration of the ignition cycle. |
| • | The antilock brake system (ABS) is disabled if voltage exceeds 19.5 V. |
| • | The EBCM requests the MIL to be turned ON. |
| • | The BRAKE indicator turns ON. |
| • | The antilock brake system (ABS) indicator turns ON if voltage exceeds 19.5 V. |
| • | The vehicle dynamics caution (VDC) indicator turns ON. |
| • | The driver information center (DIC) displays the SERVICE TRACTION CONTROL message. |
| • | The DIC displays the SERVICE STABILITRAK message. |
| • | The DIC displays the SERVICE BRAKES SOON message. |
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
| • | This DTC could be set by overcharging with a battery charger or jump starting. |
| • | A high voltage DTC in multiple modules indicates a concern in the charging system. |
Reference Information
Schematic Reference
| • | Antilock Brake System Schematics for less than 3900 kg (8600 lb) GVW |
| • | Antilock Brake System Schematics for greater than 3900 kg (8600 lb) GVW |
Connector End View Reference
Description and Operation
| • | ABS Description and Operation for less than 3900 kg (8600 lb) GVW |
| • | ABS Description and Operation for greater than 3900 kg (8600 lb) GVW |
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Engine running, accessories OFF, measure and record the voltage at the battery voltage at the battery terminals. The voltage should be between 12.6 and 15.0 V.
- Observe the scan tool EBCM Battery Voltage Signal parameter. The reading should be between 12.6 and 15.0 Volts.
| ⇒ | If not within the specified range, refer to Charging System Test. |
| ⇒ | If greater than the specified range, replace the EBCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for EBCM replacement, setup, and programming.
