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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1813 (Sunroof System) >> Diagnostic Information and Procedures >> Power Sunroof Does Not Open to Express Position >> Test Description

Test Description

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

The number below refers to the step number on the diagnostic table.

  1. 2:  If the express open feature does operate properly, then suspect the express open signal circuit for a poor connection or intermittent.
Power Sunroof Does Not Open to Express Position

Step Action Value(s) Yes No
Schematic Reference: Sunroof Schematics 
Connector End View Reference: Sunroof Connector End Views 
DEFINITION: Express open feature is inoperative.
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2  Operate the power sunroof express open feature.
Does the system operate normally?		 - Go to Testing for Intermittent Conditions and Poor Connections Go to Step 3 
3
  1. Remove the sunroof switch from the headliner.
  2. Turn the ignition ON, with the engine OFF.
  3. Operate the sunroof switch to slide the sunroof glass to the close position.
  4. Connect a 3-amp fused jumper wire between the sunroof switch express signal circuit and the sunroof switch open signal circuit at the sunroof switch harness connector.
  5. Press the sunroof switch to the express open position.
Does the sunroof glass express open?		 - Go to Step 7  Go to Step 4 
4
  1. Disconnect the sunroof switch from the harness connector.
  2. Measure the voltage of the sunroof switch express signal circuit of the sunroof switch harness connector to ground.
Does the voltage measure near the specified value?		 4.6-5.2 V Go to Step 5  Go to Step 9 
5 Test the sunroof switch express signal circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 10  Go to Step 6 
6 Inspect the sunroof switch express signal circuit for a poor connection at the sunroof module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 10  Go to Step 9 
7 Inspect for a poor connection at the sunroof switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 10  Go to Step 8 
8 Replace the sunroof switch. Refer to Sunroof Switch Replacement .
Did you complete the replacement?		 - Go to Step 10  -
9 Replace the sunroof module. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 10  -
10
  1. Remove any jumper wires.
  2. Reconnect all previously disconnected components.
  3. Replace sunroof fuse, if necessary.
  4. Turn ON the ignition, with the engine OFF.
  5. Operate the system in order to verify the repair.
Did you correct the condition?		 - System OK Go to Step 2 
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