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Home >> Cadillac >> 2003 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 459 (Antilock Brake System, Traction Control System & Stability Control System) >> Diagnostic Information and Procedures >> DTC C0472 or C0473: Steering Handwheel Speed Sensor Signal Circuit >> Test Description
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Test Description

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

  1. 3:  This step test the circuitry in the high voltage range.
  2. 4:  This step test the circuitry in the low voltage range.
  3. 5:  This step tests the low reference circuit of the steering wheel position sensor.
DTC C0472 or C0473

Step Action Values Yes No
Schematic Reference:  Body Control System Schematics  in Body Control System
Connector End View Reference:  Body Control System Connector End Views  in Body Control System
1 Did you perform the ABS Diagnostic System Check? - Go to Step 2  Go to Diagnostic System Check - ABS (W/O JL4)  or Diagnostic System Check - ABS (W/JL4) 
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 OFF the ignition.
  2. Disconnect the steering wheel position sensor harness connector.
  3. Turn ON the ignition.
  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. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
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 in Wiring Systems.
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 in Wiring Systems.
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 in Wiring Systems.
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 in Wiring Systems.
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 in Wiring Systems.
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 in Steering Wheel and Column.
Did you complete the replacement?		 - Go to Step 14  -
13
IMPORTANT: Perform the set-up 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 14  -
14
  1. Use the scan tool to clear all DTCs from all modules.
  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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