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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 993 (REAR WHEEL STEERING SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC C0527: REAR WHEEL STEERING CONTROL MODULETEST DESCRIPTION
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Test Description

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION 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. 2:  This step helps the technician determine if the fault is current.
  2. 3:  This step determines if the DTC is the result of an intermittent connection at the control module.
DTC C0527

Step Action Yes No
Schematic Reference:  Rear Wheel Steering Schematics  
Connector End View Reference:  Rear Wheel Steering Connector End Views  
1 Did you perform the Diagnostic System Check-Rear Wheel Steering? Go to Step 2  Go to Diagnostic System Check - Rear Wheel Steering 
2 
  1. Install a scan tool.
  2. Turn the ignition switch to the ON position, with the engine ON.
  3. With a scan tool, monitor the DTC Information for DTC C0527 in the rear wheel steering control module.
Does the scan tool indicate that DTC C0527 is current?		 Go to Step 3  Go to Diagnostic Aids
3  Inspect for poor connections at the harness connector of the rear wheel steering control module. 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 7  Go to Step 4 
4
IMPORTANT: If the wiring harness to the steering gear motor is damaged in any way, it MUST be replaced. You can only service the connectors and terminals.
Inspect for poor connections at the harness connector of the rear wheel steering control module and the steering gear motor connector. 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 7  Go to Step 5 
5
  1. Replace the steering gear motor assembly. Refer to Steering Gear Motor Assembly Replacement  in Rear Wheel Steering.
  2. Use the scan tool in order to clear the DTCs.
  3. Operate the vehicle within normal operating conditions.
Does the DTC reset?		 Go to Step 6  Go to Step 7 
6
IMPORTANT: Perform the Learn Alignment procedure. Refer toMeasuring Wheel Alignment (w/Rear Wheel Steering)Measuring Wheel Alignment (w/o Rear Wheel Steering) in Wheel Alignment.
Replace the rear wheel steering module. Refer to Rear Wheel Steering Control Module Replacement Did you complete the replacement?		 Go to Step 7  -
7
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within normal operating conditions.
Does the DTC reset?		 Go to Step 2  System OK
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.