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 C0899: Device Voltage Low - EBCMDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
B+ | C0899 | C0899 | -- | -- |
Ground | -- | C0899 | -- | -- |
Typical Scan Tool Data
Circuit | Short to Ground | Open | Short to Voltage |
|---|---|---|---|
Operating Conditions: Ignition ON, engine OFF. Parameter Normal Value: 12.60 Volts | |||
B+ | 0.00 Volts | 0.00 Volts | 12.60 Volts |
Circuit/System Description
The electronic brake control module (EBCM) monitors the ignition 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 EBCM detects that the battery voltage is less than 9 volts for 100 msec.
Action Taken When the DTC Sets
| • | The antilock brake system (ABS), traction control system (TCS) and vehicle stability enhancement system (VSES) are disabled for the duration of the ignition cycle. |
| • | The ABS and TCS indicators turn ON. |
| • | The DIC displays the SERVICE STAB SYS message, if equipped. |
Conditions for Clearing the DTC
| • | The DTC passes when the condition for the DTC is no longer present. |
| • | The EBCM automatically clears a 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
Description and Operation
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 volts.
- Observe the scan tool EBCM Battery Voltage parameter. The reading should be between 12.60 and 15.00 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 ohms between the ground circuit terminals listed below and ground:
- Verify that a test lamp illuminates between the B+ circuit terminals listed below and ground:
- Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 21 and ground.
- If all circuits test normal, replace the EBCM.
| • | Terminal 2 |
| • | Terminal 3 |
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| • | Terminal 1 |
| • | Terminal 4 |
| ⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. |
| ⇒ | If the test lamp does not illuminate, test the ignition 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.
