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Home >> Isuzu >> 2007 >> i-290 LS, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 43 (Sunroof System) >> Diagnostic Information and Procedures >> Power Sunroof Inoperative >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.

Sunroof Switch

  1. Ignition OFF, disconnect the harness connector at the sunroof switch.
  2. Test for infinite resistance between the following sunroof switch terminals with the switch in the open position:
    • Switch low reference terminal 5 and roof open terminal 8
    • Switch low reference terminal 5 and roof express terminal 7
    • Switch low reference terminal 5 and roof close terminal 2
    • Switch low reference terminal 5 and vent open terminal 4
    • Switch low reference terminal 5 and vent express terminal 1
    • Switch low reference terminal 5 and vent close terminal 6
    • If less than infinite for any test, replace the sunroof switch.
    IMPORTANT: If the switch tests open in any switch position other than Off, test the sunroof switch signal circuits for a short to voltage before replacing the switch.
  3. Test for less than 3 ohms of resistance between the following sunroof switch terminals while pressing the appropriate switch.
    • Switch low reference terminal 5 and roof open terminal 8
    • Switch low reference terminal 5 and roof express terminal 7
    • Switch low reference terminal 5 and roof close terminal 2
    • Switch low reference terminal 5 and vent open terminal 4
    • Switch low reference terminal 5 and vent express terminal 1
    • Switch low reference terminal 5 and vent close terminal 6
    • If greater than 3 ohms on any of the tests, replace the sunroof switch.

Sunroof Limit Switch

  1. Ignition ON, press the sunroof switch to move the sunroof to the full closed position.
  2. Ignition OFF, disconnect the C1 harness connector at the sunroof motor.
  3. Test for less than 5.0 ohms of resistance between the sunroof motor limit switch terminal 1 and the low reference terminal 3.
    • If greater than 5.0 ohms, replace the sunroof motor.
  4. Ignition ON, press the sunroof switch to move the sunroof to the open or vent position.
  5. Ignition OFF, test for infinite resistance between the sunroof motor limit switch terminal 1 and the low reference terminal 3.
    • If less than infinite, replace the sunroof motor.
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