For 1990-2009 cars

### 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.

### Circuit/System Description

Battery voltage is supplied to the antilock brake system (ABS) warning lamp with the ignition switch in the ON or START position. The warning lamp should be activated only by the ABS control module internally supplying ground to terminal 10.

### Reference Information

#### Schematic Reference

Antilock Brake System Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

ABS Description and Operation

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Control Module References for scan tool information

### Circuit/System Verification

Verify EBCM connector is secure.

⇒ | If EBCM connector is not secure, repair EBCM connection

### Circuit/System Testing

1. Ignition OFF, disconnect the EBCM connector.
2. Release the shorting bar from terminal 10 and test for infinite resistance between terminal 10 of the EBCM connector and ground.

⇒ | If resistance in not as specified, repair the circuit for a short to ground. If the circuit tests normal, replace the BPMV/EBCM.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM replacement, setup, and programming