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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1131 (Sunroof System) >> Diagnostic Information and Procedures >> Power Sunroof/Sunshade Inoperative >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.

Sunroof/Sunshade Test

  1. Ignition OFF, disconnect the harness connector at the inoperative sunroof or sunshade switch.
  2. Test for less than 5.0 ohms between the ground circuit terminal B and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, connect a 3A fused jumper wire between the signal circuit listed below and ground. The roof or sunshade should be inoperative in at least one or more directions.
    • Roof open terminal D
    • Roof close terminal E
    • If the roof or shade moved in both directions, test or replace the switch.
  4. Ignition OFF, disconnect the harness connector at the inoperative sunroof or sunshade motor/actuator.
  5. Test for less than 5.0 ohms between the ground circuit terminal 1 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  6. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 6 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  7. Verify that a test lamp illuminates between the ignition circuit terminal 3 and ground.
  8. Ignition OFF, connect the harness connector at the sunroof or sunshade motor/actuator.
  9. Ignition ON, at the sunroof switch harness connector, test for B+ between the signal circuits listed below and ground.
    • Roof open terminal D
    • Roof close terminal E
    • If less than the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit test normal, replace the sunroof motor/actuator.
  10. If all circuit test normal, replace the appropriate sunroof or sunshade motor/actuator.

Serial Data Circuit Test

  1. Ignition OFF, disconnect the harness connector at the sunshade motor/actuator.
  2. Ignition ON, test for 10-40Hz between the serial data circuit terminal 7 and ground.
    • If less than the specified range, test the serial data circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the sunroof motor/actuator.
  3. Test for 50-200Hz between the serial data circuit terminal 7 and ground while operating the sunshade switch in the forward and rearward directions.
    • If not the specified range, replace the sunroof motor/actuator.
  4. If all circuits test normal, replace the sunshade motor/actuator.
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