For 1990-2009 cars

### Diagnostic Instructions

• | Perform the Diagnostic System Check - Vehicle prior to using the 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 C0800: Battery Voltage Out Of Range

### Circuit/System Description

Proper operation of the electronic brake control module (EBCM) requires a certain minimum voltage. The EBCM monitors the ignition feed circuit to determine if the voltage falls below a minimum level.

### Conditions for Running the DTC

• | Vehicle speed is greater than 6 km/h (4 mph) with the brake pedal not applied.

| OR

• | Vehicle speed is greater than 15 km/h (9 mph) and the brake pedal is actuated.

### Conditions for Setting the DTC

• | The battery is defective.

• | There is a defective ground connection.

• | A connector is damaged.

• | A wire is broken or shorted.

• | A fuse is blown.

• | The ignition switch is malfunctioning.

### Action Taken When the DTC Sets

• | The antilock brake system (ABS) is disabled during the period of low voltage.

• | The ABS warning indicator turns ON for the remainder of the ignition cycle.

If the failure is intermittent, the EBCM will enable the system at the next ignition cycle and set a history DTC.

### Conditions for Clearing the DTC

The condition for setting the DTC is no longer present and the DTC is cleared with a scan tool.

### Reference Information

#### Schematic Reference

Antilock Brake System Schematics

#### Connector End View Reference

Component Connector End Views

#### Electrical Information Reference

• | Circuit Testing

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

• | Connector Repairs

#### Scan Tool Reference

Electronic Brake Control Module Scan Tool Information

### Circuit/System Testing

1. With the ignition OFF, disconnect the EBCM connector.
2. Measure for 10-16 volts between the B+ circuits and ground at the EBCM connector.

⇒ | If voltage is not as specified, repair short to ground, open or high resistance in B+ circuits.

3. Measure for 10-16 volts between the Ignition voltage circuit and ground at the EBCM connector.

⇒ | If voltage is not as specified, repair short to ground, open or high resistance in ignition voltage circuit.

4. Measure for less than 1 ohm between the EBCM ground circuits and ground at the EBCM connector.

⇒ | If resistance is not as specified, repair open or high resistance in ground circuit.

⇒ | If all circuits test normal, replace the EBCM.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM and BPMV replacement, setup, and programming