GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 1999 🢒 Grand Prix 🢒 Body and Accessories 🢒 Roof 🢒 Power Sunroof Does Not Open

Step

Action

Value(s)

Yes

No

1

Did you perform the Power Sunroof System Check?

--

Go to Step 2

Go to Power Sunroof System Check

2

Inspect the SUNROOF fuse.

Is the fuse open?

--

Go to Step 3

Go to Step 4

3

Repair a short to ground in circuit 343.

Did you complete the repair and retest the system?

--

Go to Power Sunroof System Check

--

4

Use a test lamp in order to backprobe the sunroof module harness connector C2 terminal B to ground.

Does the test light illuminate?

--

Go to Step 6

Go to Step 5

5

Repair the poor connection or an open in circuit 343 between S394 and the sunroof module harness connector C2 terminal B.

Did you complete the repair and retest the system?

--

Go to Power Sunroof System Check

--

6
  1. Turn the ignition switch to the LOCK position.
  2. Disconnect the sunroof switch.
  3. Turn the ignition switch to the RUN position.
  4. Use a J 39200 in order to measure the voltage by backprobing between B+ and the sunroof switch harness connector terminal D.

Is the voltage within the specified range?

9-14 V

Go to Step 7

Go to Step 8

7
  1. Turn the ignition switch to the LOCK position.
  2. Reconnect the sunroof switch.
  3. Turn the ignition switch to the RUN position.
  4. Use a J 39200 in order to measure the voltage by backprobing between B+ and the sunroof switch harness connector terminal B.

Is the voltage within the specified range?

9-14 V

Go to Step 9

Go to Step 10

8

Use a J 39200 in order to measure the voltage by backprobing between B+ and the sunroof module connector C1 terminal 5.

Is the voltage within the specified range?

9-14 V

Go to Step 11

Go to Step 12

9
  1. Use a J 39200 in order to measure the voltage by backprobing between B+ and the sunroof switch terminal E.
  2. Press the sunroof switch to the CLOSED position.

Is the voltage within the specified range?

9-14 V

Go to Step 13

Go to Step 10

10

Replace the sunroof switch. Refer to Sunroof Switch Replacement .

Did you complete the repair and retest the system?

--

Go to Power Sunroof System Check

--

11

Repair the poor connection or an open in circuit 128.

Did you complete the repair and retest the system?

--

Go to Power Sunroof System Check

--

12
  1. Turn the ignition switch to the LOCK position.
  2. Disconnect the sunroof module connector C2.
  3. Turn the ignition switch to the RUN position.
  4. Use a J 39200 in order to backprobe between B+ and the sunroof module harness connector C2 terminal D.

Is the voltage level acceptable?

--

Go to Step 14

Go to Step 15

13

Use a J 39200 in order to measure the voltage by backprobing between the sunroof harness connector terminal B and ground.

Is the voltage equal the specified value?

5 V

Go to Step 16

Go to Step 17

14

Replace the sunroof module. Refer to Power Sunroof Module Replacement .

Did you complete the repair and retest the system?

--

Go to Power Sunroof System Check

--

15

Repair the following conditions in circuit 350 between the sunroof module harness connector C2 terminal D and G302.

Did you complete the repair and retest the system?

--

Go to Power Sunroof System Check

--

16

Use a J 39200 in order to measure the voltage by backprobing between the sunroof switch harness connector terminal E and ground.

Is the voltage equal to the specified value?

5 V

Go to Step 18

Go to Step 19

17

Use a J 39200 in order to measure the voltage by backprobing between the sunroof module harness connector C1 terminal 6 and ground.

Is the voltage equal to the specified value?

5 V

Go to Step 23

Go to Step 22

18
  1. Turn the ignition switch to the LOCK position.
  2. Reconnect the sunroof switch.
  3. Disconnect the sunroof actuator connector C3.
  4. Turn the ignition switch to the RUN position.
  5. Use a J 39200 in order to backprobe between the sunroof actuator harness connector C3 terminal A and terminal B.
  6. Press the sunroof switch to the OPEN position.
  7. Press the sunroof switch to the CLOSE position.

Is the voltage level within the specified range?

9-14 V

Go to Step 20

Go to Step 31

19

Use a J 39200 in order to measure the voltage by backprobing between the sunroof module harness connector C1 terminal 7 and ground.

Is the voltage equal to the specified value?

5 V

Go to Step 21

Go to Step 29

20

Replace the sunroof actuator. Refer to Sunroof Actuator Replacement .

Did you complete the repair and retest the system?

--

Go to Power Sunroof System Check

--

21

Repair the poor connection or an open in circuit 110.

Did you complete the repair and retest the system?

--

Go to Power Sunroof System Check

--

22

Repair the poor connection or an open in circuit 100.

Did you complete the repair and retest the system?

--

Go to Power Sunroof System Check

--

23
  1. Turn the ignition switch to the LOCK position.
  2. Disconnect the sunroof module connector C1.
  3. Turn the ignition switch to the RUN position.
  4. Use a J 39200 in order to measure the voltage by backprobing between B+ and the sunroof module harness connector C1 terminal 6.

Is the voltage level acceptable?

--

Go to Step 24

Go to Step 25

24

Repair the short to ground in circuit 100.

Did you complete the repair and retest the system?

--

Go to Power Sunroof System Check

--

25
  1. Turn the ignition switch to the LOCK position.
  2. Disconnect the sunroof module connector C2.
  3. Turn the ignition switch to the RUN position.
  4. Use a J 39200 in order to measure the voltage by backprobing between the sunroof module harness connector C2 terminal B and terminal D.

Is the voltage within the specified range?

9-14 V

Go to Step 14

Go to Step 26

26

Use a J 39200 in order to measure the voltage by backprobing between the sunroof module harness connector C2 terminal B and ground.

Is the voltage within the specified range?

9-14 V

Go to Step 27

Go to Step 28

27

Repair the poor connection or an open in circuit 350 between S390 and the sunroof module connector C2 terminal D.

Did you complete the repair and retest the system?

--

Go to Power Sunroof System Check

--

28

Repair the poor connection or an open in circuit 343 between S390 and the sunroof module connector C2 terminal B and S394.

Did you complete the repair and retest the system?

--

Go to Power Sunroof System Check

--

29

Use a J 39200 in order to measure the voltage by backprobing between B+ and the sunroof module harness connector C1 terminal 7.

Is the voltage within the specified range?

9-14 V

Go to Step 30

Go to Step 25

30

Repair the short to ground in circuit 110.

Did you complete the repair and retest the system?

--

Go to Power Sunroof System Check

--

31
  1. Turn the ignition switch to the LOCK position.
  2. Disconnect the sunroof module connector C2.
  3. Use a J 39200 in order to measure the voltage by backprobing between the sunroof actuator connector C3 terminal A and ground.

Does any voltage exist?

--

Go to Step 32

Go to Step 33

32

Repair a short to B+ in circuit 127.

Did you complete the repair and retest the system?

--

Go to Power Sunroof System Check

--

33

Use a J 39200 in order to measure the voltage between B+ and the sunroof actuator harness connector C3 terminal A.

Does any voltage exist?

--

Go to Step 34

Go to Step 35

34

Repair a short to ground in circuit 127.

Did you complete the repair and retest the system?

--

Go to Power Sunroof System Check

--

35

Use a J 39200 in order to inspect the continuity in circuit 127 between the sunroof module harness connector C2 terminal C and the sunroof actuator connector C3 terminal A.

Does the circuit 127 have continuity?

--

Go to Step 36

Go to Step 37

36

Use a J 39200 in order to measure the voltage between the sunroof actuator harness connector C3 terminal B and ground.

Does any voltage exist?

--

Go to Step 38

Go to Step 39

37

Repair the poor connection or an open in circuit 127.

Did you complete the repair and retest the system?

--

Go to Power Sunroof System Check

--

38

Repair a short to B+ in circuit 129.

Did you complete the repair and retest the system?

--

Go to Power Sunroof System Check

--

39

Use a J 39200 in order to measure the voltage between B+ and the sunroof actuator harness connector C3 terminal B.

Does any voltage exist?

--

Go to Step 40

Go to Step 41

40

Repair a short to ground in circuit 129.

Did you complete the repair and retest the system?

--

Go to Power Sunroof System Check

--

41

Use a J 39200 in order to inspect the continuity in circuit 129 between the sunroof module harness connector C2 terminal A and the sunroof actuator connector C3 terminal B.

Does the circuit 129 have continuity?

--

Go to Step 42

Go to Step 43

42
  1. Turn the ignition switch to the LOCK position.
  2. Disconnect the sunroof module connector C1.
  3. Turn the ignition to the RUN position.
  4. Use a J 39200 in order to backprobe between the sunroof module harness connector C1 terminal 8 and ground.

Is the voltage equal to the specified value?

5 V

Go to Step 45

Go to Step 44

43

Repair the poor connection or an open in circuit 129.

Did you complete the repair and retest the system?

--

Go to Power Sunroof System Check

--

44
  1. Turn the ignition switch to the LOCK position.
  2. Disconnect the sunroof module connector C1.
  3. Disconnect the sunroof module connector C4.
  4. Use a J 39200 in order to inspect for continuity to ground in the RED wire.

Does the RED wire have continuity to ground?

--

Go to Step 54

Go to Step 55

45

Use a J 39200 in order to backprobe between the sunroof module harness connector C1 terminal 2 and ground.

Is the voltage equal to the specified value?

5 V

Go to Step 46

Go to Step 14

46

Use a J 39200 in order to backprobe between B+ and the sunroof actuator connector C4 terminal A.

Is the voltage within the specified range?

9-14 V

Go to Step 47

Go to Step 48

47
  1. Turn the ignition switch to the LOCK position.
  2. Disconnect the sunroof module connector C1.
  3. Use a J 39200 in order to backprobe between the sunroof module harness connector C1 terminal 2 and ground.

Does any voltage exist?

--

Go to Step 49

Go to Step 50

48

Use a J 39200 in order to backprobe between B+ and the sunroof actuator harness connector C5 terminal C.

Is the voltage within the specified range?

9-14 V

Go to Step 20

Go to Step 51

49

Repair the short to B+ in the YEL wire.

Did you complete the repair and retest the system?

--

Go to Power Sunroof System Check

--

50

Repair the a poor connection or an open in the YEL wire.

Did you complete the repair and retest the system?

--

Go to Power Sunroof System Check

--

51

Use a J 39200 in order to backprobe between B+ and the sunroof actuator harness connector C4 terminal B.

Is the voltage within the specified range?

9-14 V

Go to Step 52

Go to Step 53

52

Repair the a poor connection or an open in the DK BLU wire between S399 and the sunroof actuator connector C5 terminal C.

Did you complete the repair and retest the system?

--

Go to Power Sunroof System Check

--

53

Use a J 39200 in order to backprobe between B+ and the sunroof module connector C1 terminal 1.

Is the voltage within the specified range?

9-14 V

Go to Step 56

Go to Step 14

54

Repair the short to ground in the RED wire.

Did you complete the repair and retest the system?

--

Go to Power Sunroof System Check

--

55

Repair the following conditions in the DK BLU wire between the sunroof module connector C1 terminal 1 and S399.

Did you complete the repair and retest the system?

--

Go to Power Sunroof System Check

--

56
  1. Reconnect the sunroof module connector C1.
  2. Turn the ignition switch to the RUN position.
  3. Use a J 39200 in order to measure the voltage between the sunroof actuator connector C4 terminal C and ground.

Is the voltage equal the specified value?

5 V

Go to Step 20

Go to Step 14