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 electronic brake control module (EBCM) through fuse F6 in the instrument panel (I/P) fuse block, to terminal 20 of the EBCM connector. The voltage is present when the ignition switch is in the ON or START position.

### 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

1. Verify EBCM connector is secure.

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

2. Verify battery voltage is 11-14V.

⇒ | If battery voltage is not as specified, test charging system, and/or replace battery if necessary.

### Circuit/System Testing

1. Ignition OFF, disconnect the EBCM connector.
2. Ignition ON, check for 11-14V between the B+ circuit and ground.

⇒ | If the voltage is not as specified, test the B+ circuit for a short to ground or an open/high resistance.

3. Test for less than 1 ohm between the ground circuits and ground.

⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. 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