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 Descriptors

DTC C0460 00: Steering Position Signal
DTC C0460 42: Steering Position Signal Initialization Not Accomplished
DTC C0460 4B: Steering Position Signal Calibration Not Accomplished
DTC C0460 5A: Steering Position Signal Not Plausible
DTC C0460 71: Steering Position Signal Internal Failure
DTC C0460 72: Steering Position Signal Rolling Count Invalid

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
Steering Wheel Position Sensor 12-Volt Reference | C0460 00 | C0460 00 | C0460 00 | --
Low Reference | C0460 00 | C0460 00 | C0460 00 | --
Steering Wheel Position Signal Can HI | C0460 00 | C0460 00 | C0460 00 | C0460 42, C0460 4B, C0460 5A, C0460 71, C0460 72
Steering Wheel Position Signal Can Low | C0460 00 | C0460 00 | C0460 00 | C0460 42, C0460 4B, C0460 5A, C0460 71, C0460 72

### Circuit/System Description

The electronic brake control module (EBCM) provides the steering angle sensor a 12-volt ignition supply voltage.

The steering angle sensor provides a serial data signal to the EBCM that represents the steering wheel degree of rotation. The EBCM utilizes this signal to calculate the driver intended driving direction.

### Conditions for Running the DTC

• | Ignition ON.

• | Ignition voltage is greater than 10 volts.

### Conditions for Setting the DTC

• | Steering angle sensor has an internal failure.

• | Steering angle sensor has not been initialized.

• | Steering angle sensor offset is greater than 15 degrees.

### Action Taken When the DTC Sets

• | Vehicle stability enhancement system (VSES) is disabled.

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

### Conditions for Clearing the DTC

• | The condition for 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

1. With the scan tool perform the steering position sensor calibration.
2. Clear DTC and operate the vehicle within the conditions for running the DTC. Verify the DTC does not reset.

⇒ | If the DTC resets, refer to circuit testing.

### Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the EBCM.
2. Ignition ON, test for less than 1 volt between the following circuit terminals listed below and ground.

• | Reference voltage circuit terminal 5

• | Low Reference circuit terminal 40

• | CAN Bus High Serial Data circuit terminal 18

• | CAN Bus Low Serial Data circuit terminal 19

⇒ | If greater than the specified range, test the appropriate circuit for a short to voltage.

3. Ignition OFF, test for infinite resistance between the following circuit terminals listed below and ground.

• | Reference voltage circuit terminal 5

• | Low Reference circuit terminal 40

• | CAN Bus High Serial Data circuit terminal 18

• | CAN Bus Low Serial Data circuit terminal 19

⇒ | If less than the specified value, test the appropriate circuit for a short to ground.

4. Ignition OFF, disconnect the harness connector at the Steering Angle Sensor.
5. Test for less than 2 ohms between the following circuit terminals listed below.

• | Reference voltage circuit terminal 5 at the EBCM harness connector and terminal 1 at the steering angle sensor harness connector.

• | Low Reference circuit terminal 40 at the EBCM harness connector and terminal 6 at the steering angle sensor harness connector

• | CAN Bus High Serial Data circuit terminal 18 at the EBCM harness connector and terminal 3 at the steering angle sensor harness connector.

• | CAN Bus Low Serial Data circuit terminal 19 at the EBCM harness connector and terminal 4 at the steering angle sensor harness connector.

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

6. If all circuits test normal, replace the Steering Angle Sensor. If the DTC resets replace the EBCM.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Steering Angle Sensor Centering

• | Control Module References for EBCM replacement, setup, and programming