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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 C0455: Front Steering Position Sensor Circuit >> Test Description
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Test Description

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The number below refers to the step number on the diagnostic table.

  1. 2:  If the DTC sets without turning the steering wheel or driving the vehicle, a malfunction exists in the analog steering wheel position signal to the BCM, and the BCM has set DTC C0472 or C0473.
DTC C0455

Step Action Values Yes No
Schematic Reference: ABS Schematics  or Power Distribution Schematics and Ground Distribution Schematics in Wiring Systems
Connector End View Reference: ABS Connector End Views  and Suspension Controls Connector End Views in Electronic Suspension Control (ESC)
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 
IMPORTANT: Center the steering wheel before proceeding with this step. Do not rotate the steering wheel while performing this step.
  1. Use the scan tool to clear the DTCs.
  2. Turn OFF the ignition for 5 seconds.
  3. Turn ON the ignition.
  4. Wait approximately 5 seconds to verify whether or not the DTC sets.
Does the DTC set?		 - Go to DTC C0472 or C0473  Go to Step 3 
3 Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC set?		 - Go to Step 4  Go to Diagnostic Aids
4
  1. Select Body Control Module/Data Display/Data on the scan tool.
  2. Center the steering wheel and verify that the front wheels are straight ahead.
  3. Observe the Steering Wheel Sensor Signal parameter.
Does the scan tool display an Steering Wheel Sensor Signal within the specified range?		 2.3-2.7 V Go to Step 5  Go to Step 9 
5
  1. Turn OFF the ignition.
  2. Disconnect the steering wheel position sensor harness connector. Refer to Steering Wheel Position Sensor or Steering Shaft Lower Bearing Replacement in Steering Wheel and Column.
  3. Disconnect the EBCM harness connector. Refer to Electronic Brake Control Module Replacement (w/ JL4)  or Electronic Brake Control Module Replacement (w/o JL4) .
  4. Turn ON the ignition.
  5. Test the steering wheel position circuits, signal A and signal B for the following.
    • Intermittently open
    • Intermittently shorted to ground
    • Intermittently shorted together
    • Intermittently shorted to voltage
Refer to Testing for Electrical Intermittents and Wiring Repairs in Wiring Systems.Did you find and correct the condition?		 - Go to Step 10  Go to Step 6 
6 Test the battery positive voltage circuit to the steering wheel position sensor for an intermittent open. Refer to Testing for Electrical Intermittents and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 10  Go to Step 7 
7 Test both of the steering wheel position sensor ground circuits for an intermittent open. Refer to Testing for Electrical Intermittents and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 10  Go to Step 8 
8 Inspect for poor connections at the harness connector of the steering wheel position sensor and at the harness connector of the EBCM. 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 10  Go to Step 9 
9 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 10  -
10
  1. Use the scan tool Clear All Class 2 DTCs function to clear all of the DTCs from all modules.
  2. Turn OFF the ignition for 5 seconds.
  3. Turn ON the ignition.
  4. 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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