The steering wheel position sensor is a 0-5 volt device which is used to sense steering wheel position and turning speed. The valid signal voltage range of the sensor is 0.35-4.75 volts. The signal voltage will increase or decrease within the valid voltage range as the steering wheel is turned. The body control module (BCM) monitors the steering wheel position sensor signal voltage and transmits this data on the serial data line.
This diagnostic procedure supports the following DTCs:
• | DTC C0472 Steering Hand Wheel Speed Sensor Signal Circuit |
• | DTC C0473 Steering Hand Wheel Speed Sensor Signal Circuit |
The ignition is ON.
The BCM detects that the analog steering signal circuit is open, shorted to ground or shorted to voltage.
The BCM sends a serial data message reporting the failed steering signal.
• | A current DTC will clear when the malfunction is no longer present. |
• | A history DTC will clear after 100 consecutive malfunction-free ignition cycles or when the scan tool Clear DTCs function is used. |
Thoroughly inspect connections or circuitry that may cause an intermittent malfunction. Refer to the following:
The numbers below refer to the step numbers on the diagnostic table.
This step test the circuitry in the high voltage range.
This step test the circuitry in the low voltage range.
This step tests the low reference circuit of the steering wheel position sensor.
Step | Action | Values | Yes | No |
---|---|---|---|---|
Schematic Reference: Body Control System Schematics Connector End View Reference: Computer/Integrating Systems Connector End Views | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |
2 |
Does the DTC reset? | -- | Go to Step 3 | Go to Diagnostic Aids |
Does the scan tool indicate that the steering wheel position sensor data parameter is less than specified value? | 0.15 V | Go to Step 4 | Go to Step 9 | |
Does the scan tool indicate that the steering wheel position sensor data parameter is greater than specified value? | 4.75 V | Go to Step 5 | Go to Step 6 | |
Use a DMM to measure the voltage between the steering wheel position 5-volt reference circuit and the steering wheel position low reference circuit. Does the voltage measure greater than the specified value? | 4.75 V | Go to Step 10 | Go to Step 8 | |
6 | Test the 5-volt reference circuit of the steering wheel position sensor for an open. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 14 | Go to Step 7 |
7 | Test the signal circuit of the steering wheel position sensor for an open or a short to ground. Refer to Testing for Short to Ground and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 14 | Go to Step 11 |
8 | Test the low reference circuit of the steering wheel position sensor for an open. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 14 | Go to Step 11 |
9 | Test the signal circuit of the steering wheel position sensor for a short to voltage. Refer to Testing for Short to Ground and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 14 | Go to Step 13 |
10 | Inspect for poor connections at the harness connector of the steering wheel position sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 14 | Go to Step 12 |
11 | Inspect for poor connections at the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 14 | Go to Step 13 |
12 | Replace the steering wheel position sensor. Refer to Steering Wheel Position Sensor or Steering Shaft Lower Bearing Replacement . Did you complete the replacement? | -- | Go to Step 14 | -- |
13 | Replace the BCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 14 | -- |
14 |
Does the DTC reset? | -- | Go to Step 2 | System OK |