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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 970 (Rear Wheel Steering System) >> Diagnostic Information and Procedures >> DTC C0472: Steering Handwheel Speed Sensor Signal V Low; C0473: Steering Handwheel Speed Sensor Signal V High >> Test Description

Test Description

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 4:  This step checks the 5-volt reference and signal circuits. It also checks the ability of the BCM to read the signal circuit.
  2. 5:  This step checks the integrity of the low reference circuit.
  3. 10:  This step tests for excessive voltage on the 5-volt reference circuit.
DTC C0472 or C0473

Step Action Values Yes No
Schematic Reference: Body Control System Schematics in Body Control System
Connector End View Reference: Rear Wheel Steering Connector End Views 
1 Did you perform the Rear Wheel Steering Diagnostic System Check? - Go to Step 2  Go to Diagnostic System Check - Rear Wheel Steering 
2
  1. Use the scan tool to clear the DTC.
  2. Start the engine.
  3. With the engine running, turn the steering wheel back and forth from lock to lock.
Does the DTC reset?		 - Go to Step 3  Go to Diagnostic Aids
3
  1. Turn the ignition OFF.
  2. Disconnect the steering wheel position sensor harness connector.
  3. Turn the ignition ON.
  4. Select the Body Control Module Data List on the scan tool.
  5. Observe the Analog SWPS Signal parameter on the scan tool.
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 
4 
  1. Connect a 3-amp fused jumper wire between the steering wheel position 5-volt reference circuit and the analog steering signal circuit.
  2. Observe the Analog SWPS Signal parameter on the scan tool.
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 
5  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 or short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 15  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 in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 15  Go to Step 12 
8 Test the low reference circuit of the steering wheel position sensor for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 15  Go to Step 12 
9 Test the signal circuit of the steering wheel position sensor for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 15  Go to Step 14 
10  Test the 5-volt reference circuit of the steering wheel position sensor for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 15  Go to Step 11 
11 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 in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 15  Go to Step 13 
12 Inspect for poor connections at the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 15  Go to Step 14 
13
IMPORTANT: Perform the learn alignment procedure. Refer to Measuring Wheel Alignment (w/Rear Wheel Steering)Measuring Wheel Alignment (w/o Rear Wheel Steering)
Replace the steering wheel position sensor. Refer to Steering Wheel Position Sensor or Steering Shaft Lower Bearing Replacement in Steering Wheel and Column.Did you complete the replacement?		 - Go to Step 15  -
14
IMPORTANT: Perform the setup procedure for the BCM.
Replace the BCM. Refer to Body Control Module Replacement in Body Control Systems.Did you complete the replacement?		 - Go to Step 15  -
15
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the conditions for running the DTC as specified in the supporting text.
Does the DTC reset?		 - Go to Step 2  System OK
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