Diagnostic Instructions

DTC Descriptors

DTC C0455 09: Front Steering Position Sensor Circuit Rate of Change Above Threshold

DTC C0455 0A: Front Steering Position Sensor Circuit Rate of Change Below Threshold

DTC C0455 19: Front Steering Position Sensor Circuit Signal Amplitude Greater Than Maximum

DTC C0455 39: Front Steering Position Sensor Circuit Internal Electronic Failure

DTC C0455 5A: Front Steering Position Sensor Circuit Plausibility Failure

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
5-Volt Reference	C0880 00, C12E5, C0880 02, C120F	C0455 39	C0880 00, C12E5	--
Steering Angle Sensor Signal	C0455 39	C0455 39	C0455 39	C0455 09, C0455 0A, C0455 19
Steering Angle Sensor Phase A Signal	C0455 5A	C0455 5A	C0455 39	C0455 09, C0455 0A, C0455 19
Steering Angle Sensor Phase B Signal	C0455 5A	C0455 5A	C0455 39	C0455 09, C0455 0A, C0455 19
Steering Angle Sensor Index Signal	--	--	C0455 39	C0455 09, C0455 0A, C0455 19
Low Reference	C0294 00, C120C, C12F8, C0161 04, C127D, C0880 00, C12E5, C0455 39	--	--	--

Circuit/System Description

The electronic brake control module (EBCM) monitors the Phase A , Phase B, Index and Analog signal circuits from steering angle sensor. The analog signal is used along with the index pulse to calibrate the steering angle sensor (SAS). The SAS position is then determined by Phase A and Phase B signals. The 2 input signals Phase A and Phase B are approximately 90 degrees out of phase. Once calibrated, the EBCM dynamically interprets the relationship between the Phase A and Phase B inputs, and determines the position of the steering wheel and the direction of the steering wheel rotation.

Conditions for Running the DTC

Conditions for Setting the DTC

C0455 09 or C0455 19

The EBCM detects an internal sensor failure.

C0455 0A

The EBCM detects the steering-angle signal not changing while the yaw rate signal changes.

C0455 39 or C0455 5A

The EBCM detects a short to voltage, short to ground or an open/high resistance on one of the steering angle sensor circuits.

Action Taken When the DTC Sets

Conditions for Clearing the DTC

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

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the steering angle sensor.
2. Ignition OFF, test for less than 5.0 ohm between the low reference circuit terminal  2 and ground.

⇒	If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the EBCM.

3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 1 and ground.

⇒	If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the EBCM.

⇒	If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the EBCM.

4. Verify the scan tool Steering Wheel Sensor Signal parameter is less than 1 volt.

⇒	If greater than the specified range, test the signal circuit terminal 6 for a short to voltage. If the circuit tests normal, replace the EBCM.

5. Install a 3A fused jumper wire between the signal circuit terminal 6 and the 5-volt reference circuit terminal 1. Verify the scan tool Steering Wheel Sensor Signal parameter is greater than 4.5 volts.

⇒	If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the EBCM.

6. Verify the scan tool Digital SWPS Phase A parameter is High.

⇒	If not the specified parameter, test the signal circuit terminal 7 for a short to ground. If the circuit tests normal, replace the EBCM.

7. Install a 3A fused jumper wire between the signal circuit terminal 3 and the low reference circuit terminal 2. Verify the scan tool Digital SWPS Phase A parameter is Low.

⇒	If not the specified parameter, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the EBCM.

8. Verify the scan tool Digital SWPS Phase B parameter is High.

⇒	If not the specified parameter, test the signal circuit terminal 4 for a short to ground. If the circuit tests normal, replace the EBCM.

9. Install a 3A fused jumper wire between the signal circuit terminal 4 and the low reference circuit terminal 2. Verify the scan tool Digital SWPS Phase B parameter is Low.

⇒	If not the specified parameter, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the EBCM.

10. Ignition ON, test for B+ between the signal circuit terminal 5 and ground.

⇒	If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the EBCM.

11. If the circuits test normal, replace the steering angle sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.