Important: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
The solenoid relay, located within the electronic brake control module (EBCM), supplies battery voltage to all of the valve solenoids.
• | Ignition voltage is greater than 9.5 volts. |
• | The solenoid relay is commanded ON. |
One or more of the following conditions exists:
• | The EBCM detects an open in the battery positive voltage circuit to the solenoid valve relay. |
• | The EBCM detects a stuck open solenoid valve relay or an open circuit between the solenoid valve relay and solenoid valves. |
• | The EBCM disables the ABS/EBD for the duration of the ignition cycle. |
• | The ABS indicator turns ON. |
• | The red brake warning indicator turns ON. |
• | The condition for setting 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. |
Antilock Brake System Schematics
Antilock Brake System Connector End Views
With the scan tool, access the ABS special functions menu and perform the ABS Motor test. The pump motor should function and no DTCs should be set.
Test for an open or a short to ground in the solenoid valve battery positive voltage circuit.
⇒ | If battery positive voltage circuit tests normal, replace the EBCM/BPMV assembly. |
Important: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for EBCM replacement, setup, and programming.