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 Descriptor

DTC C0899 : Device Voltage Low

### Circuit/System Description

The electronic brake control module (EBCM) monitors the ignition voltage level available for system operation. A low voltage condition prevents the system from operating properly.

### Conditions for Running the DTC

• | The vehicle speed is greater than 8 km/h (5 mph).

• | The system relay is commanded ON.

### Conditions for Setting the DTC

• | During initialization or when the system is inactive, the system voltage is less than 10.8 volts.

• | During the system operation, the system voltage is less than 9.0 volts.

### Action Taken When the DTC Sets

• | The EBCM disables the ABS for the duration of the ignition cycle.

• | The TC indicator turns ON.

• | The ABS indicator turns ON.

### Conditions for Clearing the DTC

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

• | The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

### 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

Scan Tool Data List

### Circuit/System Testing

1. Measure the voltage at the battery terminals.
2. With scan tool read the ignition voltage in the EBCM data list. Verify that battery terminal voltage and ignition voltage readings do not differ more than 1 volt.

⇒ | If more than 1 volt test the ground circuit of the EBCM for high resistance or replace the EBCM.

3. Go to Charging System Test .

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Brake Pressure Modulator Valve Assembly Replacement

• | Control Module References