Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of this diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptors
DTC C0899 00: Device Voltage Low - EBCM (w/o JL4)DTC C0899 03: Device Voltage Low - EBCM (JL4)
Diagnostic 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 | -- | -- |
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 |
Circuit/System Description
The electronic brake control module (EBCM) monitors the battery positive (B+) voltage level available for system operation. A low voltage condition prevents the system from operating properly.
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
The ignition voltage available to the EBCM is less than 9 volts 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 vehicle dynamics caution (VDC) indicator turns ON. |
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
A low 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. |
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the EBCM.
- Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5 Ω between the ground circuit terminals listed below and ground.
- Verify that a test lamp illuminates between the B+ circuit terminals listed below and ground.
- If all circuits test normal, replace the EBCM.
| • | Terminal 11 (JL4) |
| • | Terminal 38 (w/o JL4) |
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| • | Terminal 1 (JL4) |
| • | Terminal 25 (w/o JL4) |
| ⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for EBCM replacement, setup, and programming.
