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 B0010: Reverse Gear Signal CircuitDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Backup Lamp Supply Voltage | -- | B0010 | 1 | -- |
1. Reverse lamp always illuminated | ||||
Circuit/System Description
The electronic brake module (EBCM) receives a 12-volt signal from the backup lamp supply voltage circuit when the vehicle transmission is in reverse. The EBCM uses the backup lamp supply voltage circuit to perform traction control and vehicle stability in reverse.
Conditions for Running the DTC
| • | The ignition is ON. |
| • | The vehicle speed is greater than 15 km/h (9 mph) for 2 seconds continuously. |
| • | The vehicle is equipped with a manual transmission. |
Conditions for Setting the DTC
The EBCM detects an open in the backup lamp supply voltage circuit.
Action Taken When the DTC Sets
| • | The EBCM disables the Traction Control System (TCS)/Vehicle Stability Enhancement System (VSES) for the duration of the ignition cycle. |
| • | Driver information center (DIC) displays the TRACTION FAILED message. |
| • | DIC displays the SERVICE STAB SYS message. |
| • | Stability Caution indicator turns ON. |
Conditions for Clearing the DTC
The DTC clears automatically from current status when the fault is corrected and the ignition is cycled. Use a scan tool to clear the DTC from history status.
Diagnostic Aids
B0010 sets if all of the reverse lamp bulbs are open.
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
- Turn ON the ignition with the engine OFF. Place the gear selector of the transmission in reverse. The reverse lamps should illuminate.
- Turn the ignition OFF. Disconnect the EBCM harness connector. Connect a test lamp between the backup lamp supply voltage circuit of the harness connector and ground. Turn the ignition ON and place the gear selector of the transmission in reverse.
| ⇒ | If the reverse lamps do not illuminate, go to Diagnostic Aids or Symptoms - Lighting. |
| ⇒ | If the test lamp does not illuminate, repair open in the backup lamp supply voltage circuit between the splice and the EBCM connector. |
| ⇒ | If the test lamp illuminates, replace the EBCM/brake pressure modulator valve (BPMV) assembly. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for EBCM and BPMV replacement, setup, and programming
