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 Descriptors
DTC C0256 04: Valve Relay Contact Circuit OpenDTC C12E6: Valve Relay Contact Circuit Open
DTC C0256 0E: Valve Relay Contact Circuit Resistance Below Threshold
DTC C12E7: Valve Relay Contact Circuit Resistance Below Threshold
Circuit/System Description
The base brake solenoid relay, located within the electronic brake control module (EBCM), supplies battery voltage to all of the valve solenoids.
Conditions for Running the DTC
| • | Ignition ON. |
| • | The ignition voltage is greater than 10 volts. |
Conditions for Setting the DTC
C0256 04 or C12E6
| • | The EBCM detects an open in the circuits to the solenoid valve relay. |
| • | The EBCM detects a stuck open solenoid valve relay. |
C0256 0E or C12E7
| • | The EBCM detects an short to battery in the circuits to the solenoid valve relay. |
| • | The EBCM detects a stuck closed solenoid valve relay. |
Action Taken When the DTC Sets
| • | The EBCM disables the antilock brake system (ABS) and the vehicle stability enhancement system (VSES) for the duration of the ignition cycle. |
| • | A DIC message and/or a warning indicator may be displayed. |
Conditions for Clearing the DTC
| • | The condition for setting the DTC is no longer present. |
| • | The EBCM clears the history DTC when a current DTC is not detected in 40 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
Verify that DTC C0256, C12E6 or C12E7 is not set.
| ⇒ | If DTC is set replace EBCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for EBCM replacement, setup, and programming
