GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

  1. Turn the headlamp/dimmer switch to the PARK position.
  2. Turn the illumination controller completely clockwise to full intensity.

Do all of the illumination lamps light at full brilliance?

--

Go to Step 13

Go to Step 2

2

  1. Turn the headlamp/dimmer switch to the PARK position.
  2. Turn the illumination controller completely clockwise to full intensity.

Are all of the illumination lamps inoperative?

--

Go to Step 15

Go to Step 3

3

  1. Turn the headlamp/dimmer switch to the PARK position.
  2. Turn the illumination controller completely clockwise to full intensity.

Are the illumination lamps of the instrument panel cluster assembly inoperative?

--

Go to Step 34

Go to Step 4

4

  1. Turn the headlamp/dimmer switch to the PARK position.
  2. Turn the illumination controller completely clockwise to full intensity.

Is the rear defogger switch illumination lamp inoperative (4-door)?

--

Go to Step 39

Go to Step 5

5

  1. Turn the headlamp/dimmer switch to the PARK position.
  2. Turn the illumination controller completely clockwise to full intensity.

Is the illumination lamp of the rear wiper/washer switch inoperative (4-door)?

--

Go to Step 44

Go to Step 6

6

  1. Turn the headlamp/dimmer switch to the PARK position.
  2. Turn the illumination controller completely clockwise to full intensity.

Is the cigar lighter illumination lamp inoperative?

--

Go to Step 49

Go to Step 7

7

  1. Turn the headlamp/dimmer switch to the PARK position.
  2. Turn the illumination controller completely clockwise to full intensity.

Is the ashtray illumination lamp inoperative?

--

Go to Step 54

Go to Step 8

8

  1. Turn the headlamp/dimmer switch to the PARK position.
  2. Turn the illumination controller completely clockwise to full intensity.

Is the radio illumination inoperative?

--

Go to Radio/Audio System Check

Go to Step 9

9

  1. Turn the headlamp/dimmer switch to the PARK position.
  2. Turn the illumination controller completely clockwise to full intensity.

Is the illumination lamp of the cruise control on/off switch inoperative?

--

Go to Step 59

Go to Step 10

10

  1. Turn the headlamp/dimmer switch to the PARK position.
  2. Turn the illumination controller completely clockwise to full intensity.

Is the heater control illumination lamp inoperative?

--

Go to Step 64

Go to Step 11

11

  1. Turn the headlamp/dimmer switch to the PARK position.
  2. Turn the illumination controller completely clockwise to full intensity.

Is the illumination lamp of the manual selector lever inoperative (for automatic transmission)?

--

Go to Step 67

Go to Step 12

12

  1. Turn the headlamp/dimmer switch to the PARK position.
  2. Turn the illumination controller completely clockwise to full intensity.

Is the illumination lamp of the power/normal lever inoperative (for 4-speed automatic transmission)?

--

Go to Step 70

Go to Step 13

13

Slowly turn the illumination controller counterclockwise.

Do all of the illumination lamps dim as you turn the illumination controller?

--

Go to Step 14

Go to Step 75

14

Turn the headlamp/dimmer switch to the OFF position.

Do all illumination lamps go out?

--

System OK

Go to Step 78

15

  1. Remove the headlamp relay 2.
  2. Connect a J 36169-A fused jumper wire from cavity 2 of the headlamp relay 2 connector to cavity 4.

Do all of the illumination lamps light?

--

Go to Step 16

Go to Step 25

16

Connect a J 35616-200 unpowered test lamp from cavity 1 of the headlamp relay 2 connector to ground.

Does the test lamp light?

--

Go to Step 18

Go to Step 17

17

Repair the open in the WHT wire between fuse block 2 and headlamp relay 2. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 1

--

18

Use a J 35616-200 unpowered test lamp in order to backprobe the combination switch connector from cavity 18 to B+.

Does the test lamp light?

--

Go to Step 19

Go to Step 22

19

Test for an open in the RED/BLU wire between headlamp relay 2 and the combination switch.

Does an open exist?

--

Go to Step 20

Go to Step 21

20

Repair the open in the RED/BLU wire between headlamp relay 2 and the combination switch. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 1

--

21

Replace headlamp relay 2. Refer to Headlamp Relay Replacement .

Is the repair complete?

--

Go to Step 1

--

22

Test for an open in the BLK wire between the combination switch and G202.

Does an open exist?

--

Go to Step 23

Go to Step 24

23

Repair the open in the BLK wire between the combination switch and G202. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 1

--

24

Replace the combination switch.

Is the repair complete?

--

Go to Step 1

--

25

With the fused jumper still connected, use a test lamp in order to backprobe the connector of headlamp relay 2 from cavity 4 to ground.

Does the test lamp light?

--

Go to Step 27

Go to Step 26

26

Repair the open in the WHT wire between S212 and headlamp relay 2.

Is the repair complete?

--

Go to Step 1

--

27

Use a J 35616-200 unpowered test lamp in order to backprobe the illumination controller connector from cavity 2 to ground.

Does the test lamp light?

--

Go to Step 34

Go to Step 28

28

Repair the open in the RED/YEL wire between headlamp relay 2 and the illumination controller. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 1

--

29

Use a J 35616-200 unpowered test lamp in order to backprobe the illumination controller connector from cavity 1 to B+.

Does the test lamp light?

--

Go to Step 30

Go to Step 33

30

Test for an open in the RED/GRN wire between S201 and the illumination controller.

Does an open exist?

--

Go to Step 31

Go to Step 32

31

Repair the open in the RED/GRN wire between S201 and the illumination controller. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 1

--

32

Replace the illumination controller.

Is the repair complete?

--

Go to Step 1

--

33

Repair the open in the BLK wire between the illumination controller and G200. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 1

--

34

Use a J 35616-200 unpowered test lamp in order to backprobe connector C1 of the instrument cluster assembly from cavity 16 to ground.

Does the test lamp light?

--

Go to Step 44

Go to Step 35

35

Repair the open in the RED/YEL wire between S221 and the instrument panel cluster assembly. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 1

--

36

Use a J 35616-200 unpowered test lamp in order to backprobe connector C1 of the instrument panel cluster assembly from cavity 15 to B+.

Does the test lamp light?

--

Go to Step 37

Go to Step 38

37

Repair or replace the instrument panel cluster assembly printed circuit. Refer to Printed Instrument Cluster Circuit Replacement in Instrument Panel, Gauges and Console.

Is the repair complete?

--

Go to Step 1

--

38

Repair the open in the RED/GRN wire between the instrument panel cluster assembly and S201. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 1

--

39

Use a J 35616-200 unpowered test lamp in order to backprobe the rear defogger switch connector from cavity 5 to ground.

Does the test lamp light?

--

Go to Step 41

Go to Step 40

40

Repair the open in the RED/YEL wire between rear defogger switch and S221. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 1

--

41

Use a J 35616-200 unpowered test lamp in order to backprobe the rear defogger switch connector from cavity 3 to B+.

Does the test lamp light?

--

Go to Step 42

Go to Step 43

42

Replace the rear defogger switch. Refer to Rear Window Defogger Switch Replacement in Stationary Windows.

Is the repair complete?

--

Go to Step 1

--

43

Repair the open in the RED/GRN wire between S201 and the rear defogger switch. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 1

--

44

Use a J 35616-200 unpowered test lamp in order to backprobe the rear wiper/washer switch connector from cavity 3 to ground.

Does the test lamp light?

--

Go to Step 46

Go to Step 45

45

Repair the open in the RED/YEL wire between S221 and the rear wiper/washer switch. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 1

--

46

Use a J 35616-200 unpowered test lamp in order to backprobe the rear wiper/washer switch connector from cavity 5 to B+.

Does the test lamp light?

--

Go to Step 47

Go to Step 48

47

Replace the rear wiper/washer switch. Refer to Windshield Wiper and Washer Switch Replacement in Wipers and Washers.

Is the repair complete?

--

Go to Step 1

--

48

Repair the open in the RED/GRN wire between S201 and the rear wiper/washer switch. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 1

--

49

Use a J 35616-200 unpowered test lamp in order to backprobe the cigar lighter lamp connector from cavity 1 to ground.

Does the test lamp light?

--

Go to Step 50

Go to Step 53

50

Test for an open in the RED/GRN wire between the cigar lighter lamp and S201.

Does an open exist?

--

Go to Step 51

Go to Step 52

51

Repair the open in the RED/GRN wire between the cigar lighter lamp and S201. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 1

--

52

Replace the cigar lighter. Refer to Cigar Lighter Housing Replacement in Instrument Panel, Gauges and Console.

Is the repair complete?

--

Go to Step 1

--

53

Repair the open in the RED/YEL wire between the cigar lighter lamp and S221. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 1

--

54

Use a J 35616-200 unpowered test lamp in order to backprobe the ashtray lamp connector from cavity 2 to ground.

Does the test lamp light?

--

Go to Step 55

Go to Step 58

55

Test for an open in the RED/GRN wire between the ashtray lamp and S201.

Does an open exist?

--

Go to Step 56

Go to Step 57

56

Repair the open in the RED/GRN wire between the ashtray lamp and S201. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 1

--

57

Replace the ashtray lamp connector.

Is the repair complete?

--

Go to Step 1

--

58

Repair the open in the RED/YEL wire between the ashtray lamp and S221. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 1

--

59

Use a J 35616-200 unpowered test lamp in order to backprobe the cruise control on/off switch connector from cavity 5 to ground.

Does the test lamp light?

--

Go to Step 60

Go to Step 63

60

Test for an open in the RED/GRN wire between S201 and the cruise control on/off switch.

Does an open exist?

--

Go to Step 61

Go to Step 62

61

Repair the open in the RED/GRN wire between S201 and the cruise control on/off switch. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 1

--

62

Replace the cruise control on/off switch. Refer to Cruise Control Switch Replacement in Cruise Control.

Is the repair complete?

--

Go to Step 1

--

63

Repair the open in the RED/YEL wire between the cruise control on/off switch and S221. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 1

--

64

Use a J 35616-200 unpowered test lamp in order to backprobe the heater control illumination lamp connector from cavity 2 to ground.

Does the test lamp light?

--

Go to Step 65

Go to Step 66

65

Repair the open in the RED/GRN wire between the heater control illumination lamp and S201. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 1

--

66

Repair the open in the RED/YEL wire between the heater control illumination lamp and S221. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 1

--

67

Use a J 35616-200 unpowered test lamp in order to backprobe the manual selector lever illumination lamp from cavity 1 to ground.

Does the test lamp light?

--

Go to Step 68

Go to Step 69

68

Repair the open in the RED/GRN wire between the manual selector lever illumination lamp and S201. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 1

--

69

Repair the open in the RED/YEL wire between the manual selector lever illumination lamp and S221. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 1

--

70

Use a J 35616-200 unpowered test lamp in order to backprobe the power/normal switch connector from cavity 1 to ground.

Does the test lamp light?

--

Go to Step 71

Go to Step 74

71

Test for an open in the RED/GRN wire between S265 and the power/normal switch.

Does an open exist?

--

Go to Step 72

Go to Step 73

72

Repair the open in the RED/GRN wire between S265 and the power/normal switch. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 1

--

73

Replace the power/normal switch. Refer to Power/Normal (P/N) Switch Replacement in Automatic Transmission.

Is the repair complete?

--

Go to Step 1

--

74

Repair the open in the RED/YEL wire between S263 and the power/normal switch. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 1

--

75

Disconnect the illumination controller connector.

Do all of the illumination lamps remain lit at full brilliance?

--

Go to Step 76

Go to Step 77

76

Repair the short to ground in the RED/GRN wire between S263 and the power/normal switch. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 1

--

77

Replace the illumination controller.

Is the repair complete?

--

Go to Step 1

--

78

Use a J 35616-200 unpowered test lamp in order to backprobe headlamp relay 2 from cavity 3 to B+.

Does the test lamp light?

--

Go to Step 79

Go to Step 82

79

Test for a short to ground in the RED/BLU wire between the combination switch and headlamp relay 2.

Does a short to ground exist?

--

Go to Step 80

Go to Step 81

80

Repair the short to ground in the RED/BLU wire between the combination switch and headlamp relay 2. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 1

--

81

Replace the combination switch.

Is the repair complete?

--

Go to Step 1

--

82

Remove headlamp relay 2.

Do all of the illumination lamps go out?

--

Go to Step 83

Go to Step 84

83

Replace headlamp relay 2. Refer to Headlamp Relay Replacement .

Is the repair complete?

--

Go to Step 1

--

84

Test for a short to voltage in the RED/YEL wire between headlamp relay 2 and the illumination lamps.

Does a short to voltage exist?

--

Go to Step 85

Go to Audible Warnings System Check

85

Repair the short to voltage in the RED/YEL wire between headlamp relay 2 and the illumination lamps. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 1

--