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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 992 (Fixed & MOVEABLE Window Systems) >> Diagnostic Information and Procedures >> Power Rear Sliding Window Malfunction >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Sliding Rear Window Switch Test

  1. Ignition OFF, disconnect the harness connector at the sliding rear window switch.
  2. Test for infinite resistance between the control terminals C and B and the voltage terminal A with the switch in the INACTIVE position.
    • If less than the specified value, replace the sliding rear window switch.
  3. Test for less than 2 ohms between the control terminal C and the voltage terminal A with the switch in the CLOSE position.
    • If greater than the specified range, replace the sliding rear window switch.
  4. Test for less than 2 ohms between the control terminal B and the voltage terminal A with the switch in the OPEN position.
    • If greater than the specified range, replace the sliding rear window switch.

Relay Test

  1. Ignition OFF, disconnect the applicable relay.
  2. Test for 60-200 ohms between terminals 85 and 86.
    • If not within the specified range, replace the relay.
  3. Test for infinite resistance between the following terminals:
    • 30 and 86
    • 30 and 87
    • 30 and 85
    • 85 and 87
    • If not the specified value, replace the relay.
  4. Test for less than 2 ohms between terminals 30 and 87A.
    • If greater than the specified range, replace the relay.
  5. Install a 3-amp fused jumper wire between relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohms of resistance between terminals 30 and 87.
    • If greater than the specified range, replace the relay.

Sliding Rear Window Motor

  1. Install a 25-amp fused jumper wire between the control terminal A and 12 volts. Momentarily install a jumper wire between the control terminal B and ground. The sliding rear window motor should perform the OPEN or CLOSE function.
    • If the function does not perform as specified, replace the sliding rear window motor.
  2. Reverse the jumper wires; the sliding rear window motor should perform the CLOSE or OPEN function.
    • If the function does not perform as specified, replace the sliding rear window motor.
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