GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2000 🢒 Grand Prix 🢒 Body and Accessories 🢒 Roof 🢒 Power Sunroof Does Not Close

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.

Is the repair complete?

--

System OK

--

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.

Is the repair complete?

--

System OK

--

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. Measure the voltage by backprobing between B+ and the sunroof switch harness connector terminal D.

Is the voltage equal to the specified value?

B+

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. Measure the voltage by backprobing between B+ and the sunroof switch harness connector terminal B.

Is the voltage equal to the specified value?

B+

Go to Step 9

Go to Step 10

8

Measure the voltage by backprobing between B+ and the sunroof module harness connector C1 terminal 5.

Is the voltage equal to the specified value?

B+

Go to Step 11

Go to Step 12

9
  1. Measure the voltage by backprobing between B+ and the sunroof switch harness connector terminal E.
  2. Press the sunroof switch to the CLOSED position.

Is the voltage equal to the specified value?

B+

Go to Step 13

Go to Step 10

10

Replace the sunroof switch. Refer to Sunroof Switch Replacement .

Is the repair complete?

--

System OK

--

11

Repair the poor connection or an open in circuit 128 between the sunroof module harness connector C1 terminal 5 and the sunroof switch harness connector terminal D.

Is the repair complete?

--

System OK

--

12
  1. Turn the ignition switch to the LOCK position.
  2. Disconnect the sunroof module connector C2.
  3. Measure for voltage by backprobing 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

Measure the voltage by backprobing between the sunroof harness connector terminal B and ground.

Is the voltage equal to the specified value?

5 V

Go to Step 16

Go to Step 17

14

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

Is the repair complete?

--

System OK

--

15

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

Is the repair complete?

--

System OK

--

16

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

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 22

Go to Step 23

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. Measure for voltage by backprobing 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 equal to the specified value in both cases?

B+

Go to Step 20

Go to Step 31

19

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 .

Is the repair complete?

--

System OK

--

21

Repair the poor connection or an open in circuit 110.

Is the repair complete?

--

System OK

--

22

Repair the poor connection or an open in circuit 100.

Is the repair complete?

--

System OK

--

23
  1. Turn the ignition switch to the LOCK position.
  2. Disconnect the sunroof module connector C1.
  3. 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.

Is the repair complete?

--

System OK

--

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. Measure the voltage by backprobing between the sunroof module harness connector C2 terminal B and terminal D.

Is the voltage equal to the specified value?

B+

Go to Step 14

Go to Step 26

26

Measure the voltage by backprobing between the sunroof module harness connector C2 terminal B and ground.

Is the voltage equal to the specified value?

B+

Go to Step 27

Go to Step 28

27

Repair the poor connection or an open in circuit 350 between the sunroof module connector C2 terminal D and G302.

Is the repair complete?

--

System OK

--

28

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

Is the repair complete?

--

System OK

--

29

Measure the voltage by backprobing between B+ and the sunroof module harness connector C1 terminal 7.

Is the voltage equal to the specified value?

B+

Go to Step 30

Go to Step 25

30

Repair the short to ground in circuit 110.

Is the repair complete?

--

System OK

--

31
  1. Turn the ignition switch to the LOCK position.
  2. Disconnect the sunroof module connector C2.
  3. 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.

Is the repair complete?

--

System OK

--

33

Measure the voltage between B+ and the sunroof actuator harness connector C3 terminal A.

Does any volage exist?

--

Go to Step 34

Go to Step 35

34

Repair a short to ground in circuit 127.

Is the repair complete?

--

System OK

--

35

Test for continuity in circuit 127 between the sunroof module harness connector C2 terminal C and the sunroof actuator harness connector C3.

Does circuit 127 have continuity?

--

Go to Step 36

Go to Step 37

36

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.

Is the repair complete?

--

System OK

--

38

Repair a short to B+ in circuit 129.

Is the repair complete?

--

System OK

--

39

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.

Is the repair complete?

--

System OK

--

41

Test for continuity in circuit 129 between the sunroof module harness connector C2 terminal A and the sunroof actuator connector C3.

Does circuit 129 have continuity?

--

Go to Step 42

Go to Step 43

42
  1. Turn the ignition switch to the LOCK position.
  2. Reconnect the sunroof module connector C2.
  3. Turn the ignition to the RUN position.
  4. Measure for voltage by backprobing between the sunroof module harness connector C1 terminal 8 and ground.

Is the voltage equal to the specified value?

5 V

Go to Step 44

Go to Step 45

43

Repair the poor connection or an open in circuit 129.

Is the repair complete?

--

System OK

--

44

Measure for voltage by backprobing between the sunroof module harness connector C1 terminal 2 and ground.

Is the voltage level acceptable?

--

Go to Step 14

Go to Step 46

45
  1. Turn the ignition switch to the LOCK position.
  2. Disconnect the sunroof module connector C1.
  3. Disconnect the sunroof actuator connector C4.
  4. Test for continuity to ground in the RED wire.

Does the RED wire have continuity to ground?

--

Go to Step 47

Go to Step 48

46
  1. Turn the ignition switch to the LOCK position.
  2. Disconnect the sunroof module connector C1.
  3. Disconnect the sunroof actuator connector C4.
  4. Test for continuity to ground in the YEL wire.

Does the YEL wire have continuity to ground?

--

Go to Step 49

Go to Step 48

47

Repair the short to ground in the RED wire.

Is the repair complete?

--

Go to Step 49

Go to Step 48

48
  1. Reconnect the sunroof module connector C1.
  2. Turn the ignition switch to the RUN position.
  3. Measure the voltage at the sunroof actuator connector C4 terminal and ground.

Is the voltage equal to the specified value?

B+

Go to Step 16

Go to Step 10

49

Repair the short to ground in the YEL wire.

Is the repair complete?

--

System OK

--