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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 >> Circuit/System Testing

Circuit/System 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.

Power Sunroof Inoperative

  1. Ignition OFF, disconnect the harness connector at the sunroof switch.
  2. Test for less than 15.0 ohms of resistance between the ground circuit terminal 5 and ground.
    • If greater than 15.0 ohms, test the following ground circuits for an open/high resistance. If all circuits test normal, replace the sunroof control module.
    • Sunroof switch ground circuit terminal 5
    • Sunroof control module harness connector C1 ground circuit terminal D
  3. Connect a 3-Amp fused jumper wire between the following sunroof switch signal circuits and ground. The roof should be inoperative in at least one or more directions.
    • Terminal 8 sunroof switch open signal
    • Terminal 2 sunroof switch close signal
    • Terminal 4 sunroof switch open vent signal
    • Terminal 6 sunroof switch close vent signal
    • If the roof moved in all directions, replace the sunroof switch.
  4. Disconnect the C1 harness connector at the sunroof control module.
  5. Ignition ON, verify that a test lamp illuminates between the battery positive voltage circuit terminal A and ground.
    • If the test lamp does not illuminate, test the battery positive voltage circuit for a short to ground or an open/high resistance
  6. Ignition OFF, connect the C1 harness connector at the sunroof control module.
  7. Ignition ON, test for 4.8-5.2 volts between the following sunroof switch signal circuits and ground.
    • Terminal 1 sunroof express vent signal
    • Terminal 2 sunroof switch close signal
    • Terminal 4 sunroof switch open vent signal
    • Terminal 6 sunroof switch close vent signal
    • Terminal 7 sunroof express signal
    • Terminal 8 sunroof switch open signal
    • If less than 4.8 volts, test the appropriate signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the sunroof control module.
    • If greater than 5.2 volts, test the appropriate signal circuit for a short to voltage. If the circuit tests normal, replace the sunroof control module.
  8. Ignition OFF, connect the harness connector at the sunroof switch.
  9. Disconnect the C2 harness connector at the sunroof motor.
  10. Connect a test lamp between the motor control circuit's terminals A and B.
  11. Press and release any of the sunroof switches. The test lamp should illuminate.
    • If the test lamp does not illuminate, test both motor control circuits for a short to ground or an open/high resistance. If the circuits test normal, replace the sunroof control module.
  12. If all circuits test normal, test or replace the sunroof motor.

Power Sunroof Express Open Feature Inoperative

  1. Ignition OFF, disconnect the harness connector at the sunroof switch.
  2. Ignition ON, with the sunroof in the closed position, connect a 3-Amp fused jumper wire between the sunroof switch open signal circuit terminal 8 and the sunroof express signal circuit terminal 7 to ground for less than 1 second. The roof should express open.
    • If the roof did not express open, test the express signal circuit for a short to voltage or an open high resistance. If the circuit tests normal, replace the sunroof control module.
  3. Ignition ON, with the sunroof in the closed position, connect a 3-Amp fused jumper wire between the sunroof switch vent open signal circuit terminal 4 and the sunroof express vent signal circuit terminal 1 to ground for less than 1 second. The roof should express vent open.
    • If the roof did not express vent open, test the express signal circuit for a short to voltage or an open high resistance. If the circuit tests normal, replace the sunroof control module.
  4. If all circuits test normal, test or replace the sunroof switch.

Power Sunroof Can Not Find the Closed Position

  1. Ignition OFF, disconnect the C1 harness connector at the sunroof motor.
  2. Test for less than 5.0 ohms of resistance between the low reference circuit terminal 3 and ground.
    • If greater than 5.0 ohms, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the sunroof control module.
  3. Ignition ON, test for 4.8-5.2 volts between the sunroof limit switch soft stop signal circuit terminal 1 and ground.
    • If less than 4.8 volts, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the sunroof control module.
    • If greater than 5.2 volts, test the signal circuit for a short to voltage. If the circuit tests normal, replace the sunroof control module.
  4. If all circuits test normal, test or replace the sunroof motor.
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