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.

### DTC Descriptor

DTC C0201 00: Antilock Brake System (ABS) Enable Relay Contact Circuit

### Circuit/System Description

The EBCM controls it's internal valve relay to command the valve solenoids ON or OFF.

### Conditions for Running the DTC

• | Ignition voltage is greater than 10 volts.

• | The solenoid relay is commanded ON.

### Conditions for Setting the DTC

• | The EBCM detects no change when commanding the valve relay ON or OFF.

• | The EBCM detects a stuck open solenoid valve relay or an open circuit between the solenoid valve relay and solenoid valves.

### Action Taken When the DTC Sets

• | The EBCM disables the antilock brake system (ABS)/traction control system (TCS).

• | A DIC message and/or a warning indicator may be displayed.

### Conditions for Clearing the DTC

• | The condition for setting the DTC is no longer present.

• | The EBCM 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

Control Module References for scan tool information

### Circuit/System Verification

Ignition ON, verify that DTC C0201 is not set.

⇒ | If DTC is set, replace the EBCM.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM replacement, setup, and programming