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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 Inoperative

Power Sunroof Inoperative

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.
Power Sunroof Inoperative

Step Action Values Yes No
Schematic Reference: Sunroof Schematics 
Connector End View Reference: Sunroof Connector End Views 
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2 Operate the power sunroof.
Does the system operate normally?		 - Go to Testing for Intermittent Conditions and Poor Connections Go to Step 3 
3 Disconnect the sunroof switch from the harness connector.
Is the sunroof glass in the fully closed position?		 - Go to Step 4  Go to Step 5 
4
  1. Turn ON the ignition, with the engine OFF.
  2. Attempt to slide the sunroof glass towards the open position, by connecting a jumper wire between the sunroof switch low reference circuit and the sunroof switch open signal circuit of the sunroof switch harness connector, for 3 seconds.
Did the sunroof glass slide open?		 - Go to Step 28  Go to Step 6 
5
  1. Turn the ignition ON, with the engine OFF.
  2. At the sunroof switch harness connector, using 2 jumper wires, connect 1 jumper wire to each:
    • Sunroof switch open signal circuit
    • Sunroof switch open vent signal circuit
  3. Attempt to slide the sunroof glass towards the closed position, by connecting the other ends of the jumper wires, at the same time, for 3 seconds to the sunroof switch low reference circuit of the sunroof switch harness connector.
Did the sunroof glass slide closed?		 - Go to Step 28  Go to Step 6 
6
  1. Remove the jumper wires.
  2. Measure the voltage of the sunroof switch open signal circuit at the sunroof switch harness connector to ground.
Does the voltage measure near the specified value?		 4.6-5.2 V Go to Step 7  Go to Step 13 
7 Measure the voltage of the sunroof switch open vent signal circuit at the sunroof switch harness connector to ground.
Does the voltage measure near the specified value?		 4.6-5.2 V Go to Step 8  Go to Step 17 
8 Measure the voltage between the sunroof switch express signal circuit at the sunroof switch harness connector to ground.
Does the voltage measure near the specified value?		 4.6-5.2 V Go to Step 9  Go to Step 32 
9 Measure the voltage between the sunroof switch express signal circuit and the sunroof switch low reference circuit at the sunroof switch harness connector.
Does the voltage measure near the specified value?		 4.6-5.2 V Go to Step 10  Go to Step 19 
10
  1. Disconnect the sunroof module harness connector that contains the sunroof switch signal circuits.
  2. Test for shorts between the sunroof switch signal circuits. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 38  Go to Step 11 
11
  1. Reconnect the sunroof switch to the harness connector.
  2. Reconnect the sunroof module harness connector that contains the sunroof switch signal circuit to the sunroof module.
  3. Disconnect the sunroof motor connector.
  4. Connect a test lamp between the sunroof motor open control and motor close control circuits at the harness connector, module side.
Does the test lamp illuminate?		 - Go to Step 20  Go to Step 12 
12
  1. Leave the test lamp between the sunroof motor open control and motor close control circuits at the harness connector, module side.
  2. While observing the test lamp, press the sunroof switch for 3 seconds to the close position then 3 seconds to the open position.
Does test lamp illuminate with each command?		 - Go to Step 30  Go to Step 23 
13 Measure the voltage of the sunroof switch open vent signal circuit at the sunroof switch harness connector to ground.
Does the voltage measure near the specified value?		 4.6-5.2 V Go to Step 16  Go to Step 14 
14
  1. Disconnect the sunroof module harness connector that contains the power sunroof fuse supply voltage circuit.
  2. Measure the battery positive voltage circuit of the sunroof control module harness connector to ground.
Does the voltage measure near the specified value?		 4.6-5.2 V Go to Step 15  Go to Step 31 
15 Measure between the battery positive voltage circuit of the sunroof control module and the ground circuit at the sunroof module harness connector.
Does the voltage measure near the specified value?		 4.6-5.2 V Go to Step 29  Go to Step 33 
16 Test for an open, high resistance or short to ground in the sunroof switch open signal circuit. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 38  Go to Step 29 
17 Test for an open, high resistance or short to ground in the sunroof switch open vent signal circuit. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 38  Go to Step 18 
18 Inspect for a poor connection in the sunroof switch open vent signal circuit. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 38  Go to Step 35 
19 Test the sunroof switch low reference circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 38  Go to Step 29 
20
  1. Connect a test lamp between the sunroof motor open control circuit at the harness connector, module side, and ground.
  2. Operate the sunroof switch to the Open, Non Express, position.
Does the test lamp illuminate?		 - Go to Step 21  Go to Step 22 
21 Test the sunroof motor open control circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 38  Go to Step 36 
22 Test the sunroof motor close control circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 38  Go to Step 35 
23
  1. Connect a test lamp between the sunroof motor open control circuit to battery positive voltage at the sunroof motor harness connector.
  2. Operate the sunroof switch to the Open, Non Express, position.
Does the test lamp illuminate?		 - Go to Step 24  Go to Step 27 
24
  1. Connect a test lamp between the sunroof motor open control circuit to ground.
  2. Press the sunroof switch to the open direction for 3 seconds.
Did the test lamp illuminate?		 - Go to Step 26  Go to Step 25 
25 Test the sunroof motor open control circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 38  Go to Step 35 
26 Test the sunroof motor close control circuit for an open, a short to ground, or high resistance. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 38  Go to Step 29 
27 Test the sunroof motor open control circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 38  Go to Step 29 
28 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 38  Go to Step 34 
29 Inspect 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 38  Go to Step 35 
30 Inspect for poor connections at the sunroof motor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 38  Go to Step 37 
31 Repair the battery positive voltage circuit of the sunroof control module for an open, high resistance, or short to ground. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 38  -
32 Repair the sunroof switch express signal circuit for an open or a short to ground. Refer to Circuit Testing and Wiring Repairs .
Did you complete the repair?		 - Go to Step 38  -
33 Repair the ground circuit of the sunroof module for an open or high resistance. Refer to Circuit Testing and Wiring Repairs .
Did you complete the repair?		 - Go to Step 38  -
34 Replace the sunroof switch. Refer to Sunroof Switch Replacement .
Did you complete the replacement?		 - Go to Step 38  -
35 Replace the sunroof module. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 38  -
36 Replace the sunroof limit switch. Refer to Sunroof Motor/Actuator Replacement .
Did you complete the replacement?		 - Go to Step 38  -
37 Replace the sunroof motor. Refer to Sunroof Motor/Actuator Replacement .
Did you complete the replacement?		 - Go to Step 38  -
38
  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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