Lucerne V6-3.8L (2007)
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If greater than 1 ohms, test the ground circuit for an open/high resistance.
7. Ignition ON, verify that a test lamp illuminates between the battery positive voltage circuit terminal 1 and ground.
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If the test lamp does not illuminate, test the battery positive voltage circuit for a short to ground or an open/high resistance
8. Ignition ON, verify that a test lamp illuminates between the battery positive voltage circuit terminal 2 and ground.
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If the test lamp does not illuminate, test the accessory voltage circuit for a short to ground or an open/high resistance
9. Ignition OFF, connect the harness connector at the sunroof motor/actuator assembly.
10. Ignition ON, test for 4.8-5.2 volts between the following sunroof switch signal circuits and ground.
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Terminal 1 sunroof express vent signal
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Terminal 2 sunroof switch close signal
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Terminal 4 sunroof switch open vent signal
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Terminal 6 sunroof switch close vent signal
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Terminal 7 sunroof express signal
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Terminal 8 sunroof switch open signal
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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 motor/actuator assembly.
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If greater than 5.2 volts, test the appropriate signal circuit for a short to voltage. If the circuit tests normal, replace the sunroof motor/actuator
assembly.
11. Ignition OFF, connect the harness connector at the sunroof switch.
12. If all circuits test normal, test or replace the sunroof motor/actuator assembly.
POWER SUNROOF EXPRESS 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 3A 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.
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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 motor/actuator assembly.
3. Ignition ON, with the sunroof in the closed position, connect a 3A 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.
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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 motor/actuator assembly.
4. If all circuits test normal, test or replace the sunroof switch.
COMPONENT TESTING
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:
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Switch low reference terminal 5 and roof open terminal 8
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Switch low reference terminal 5 and roof express terminal 7
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Switch low reference terminal 5 and roof close terminal 2
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Switch low reference terminal 5 and vent open terminal 4
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Switch low reference terminal 5 and vent express terminal 1
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Switch low reference terminal 5 and vent close terminal 6
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If less than infinite for any test, replace the sunroof switch.
3. 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.
Test for less than 3 ohms of resistance between the following sunroof switch terminals while pressing the appropriate switch.
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Switch low reference terminal 5 and roof open terminal 8
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Switch low reference terminal 5 and roof express terminal 7
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Switch low reference terminal 5 and roof close terminal 2
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Switch low reference terminal 5 and vent open terminal 4
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Switch low reference terminal 5 and vent express terminal 1
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Switch low reference terminal 5 and vent close terminal 6
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If greater than 3 ohms on any of the tests, replace the sunroof switch.
REPAIR INSTRUCTIONS
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. See: Powertrain Management/Computers and Control
Systems/Testing and Inspection/Diagnostic Trouble Code Tests and Associated Procedures/Verification Tests and Procedures
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Sunroof Switch Replacement
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Sunroof Motor/Actuator Replacement (Smart Motor)
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Control Module References for sunroof motor/actuator replacement, programming, and setup See: Testing and Inspection/Programming and
Relearning
