GM Service Manual Online
For 1990-2009 cars only

Fog Lamps Inoperative - All Domestic

Step

Action

Value(s)

Yes

No

1

Was the entire fog lights system check performed?

--

Go to Step 2

Go to Fog Lights System Check

2

  1. Turn the headlamps on.
  2. Turn the foglamp switch on.
  3. Turn the headlamp dimmer switch to the low beam position.
  4. Use a test light to backprobe between the foglamp switch harness connector circuit 317 and ground.

Did the test light illuminate?

--

Go to Step 3

Go to Step 4

3

Use a test light in order to backprobe between the foglamp relay connector terminal F9 and ground.

Did the test light illuminate?

--

Go to Step 5

Go to Step 6

4

Use a test lamp to backprobe between the foglamp switch harness connector circuit 9 and ground.

Did the test light illuminate?

--

Go to Step 13

Go to Step 12

5

Repair a poor connection or open in circuit 34.

Is the repair complete?

--

Go to step 14

--

6

Connect a test light between the foglamp relay and terminals E11 and E9.

Does the test light illuminate?

--

Go to Step 7

Go to step 8

7

Connect a test light between the foglamp relay connector terminals F11 and E9.

Does the test light illuminate?

--

Go to Step 9

Go to Step 10

8

Connect a test light between the foglamp relay connector terminal E11 and ground.

Does the test light illuminate?

--

Go to Step 11

Go to Step 12

9

Replace the foglamp relay. Refer to Fog Lamp Relay Replacement

Is the repair complete?

--

Go to Step 14

--

10

Repair a poor connection or open in circuit 317.

Is the repair complete?

--

Go to Step 14

--

11

Repair a poor connection or open in circuit 11.

Is the repair complete?

--

Go to Step 14

--

12

Repair a poor connection or open in circuit 9.

Is the repair complete?

--

Go to Step 14

--

13

Replace the foglamp switch. Refer to Fog Lamp Switch Replacement

Is the repair complete?

--

Go to Step 14

--

14

  1. Turn the ignition switch to the OFF position.
  2. Reconnect all connectors/components removed.

Have all the repairs been made?

--

Go to Fog Lights System Check

--

Fog Lamps Inoperative - All Europe

Step

Action

Value(s)

Yes

No

1

Was the entire fog lights system check performed?

--

Go to Step 2

Go to Fog Lights System Check

2

  1. Turn the headlamps on.
  2. Turn the foglamp switch on.
  3. Turn the headlamp dimmer switch to the low beam position.
  4. Use a test light to backprobe between the foglamp switch harness connector terminal E and B+.

Did the test light illuminate?

--

Go to Step 3

Go to Step 4

3

Connect a test light at the BCM connector C3 terminal D9 and B+.

Does the test light illuminate?

--

Go to Step 7

Go to Step 8

4

Use a test light to backprobe between the fog lamp switch harness connector terminal F and B+.

Did the test light illuminate?

--

Go to Step 5

Go to Step 6

5

Replace the fog lamp switch. Refer to Fog Lamp Switch Replacement

Is the repair complete?

--

Go to Step 21

--

6

Repair poor connection or open in circuit 650.

Is the repair complete?

--

Go to Step 21

--

7

Connect a test light at the BCM connector C3 terminal C8 and B+.

Does the test light illuminate?

--

Go to Step 9

Go to Step 10

8

Repair the poor conection or open in circuit 187.

Is the repair complete?

--

Go to Step 21

--

9

Connect a test light at the fog lamp relay cavity A1 and B+.

Does the test light illuminate?

--

Go to Step 11

Go to Step 12

10

Replace the BCM. Refer to Body Control Module Replacement

Is the repair complete?

--

Go to Step 21

--

11

Connect a test light between the fog lamp relay cavities C2 and A1.

Does the test light illuminate?

--

Go to Step 13

Go to Step 14

12

Repair the poor connection or open in circuit 1977.

Is the repair complete?

--

Go to Step 21

--

13

Connect a test light between the fog lamp relay cavaties A1 and C1.

Does the test light illuminate?

--

Go to Step 15

Go to Step 16

14

Repair a poor connection or open in circuit 10.

Is the repair complete?

--

Go to Step 21

--

15

Connect a test light between the fog lamp relay cavaties A1 and A2.

Does the test light illuminate?

--

Go to Step 17

Go to Step 18

16

Repair a poor connection or open in circuit 9.

Is the repair complete?

--

Go to Step 21

--

17

Connect a test light between one of the fog lamps connector terminal A and ground.

Does the test light illuminate?

--

Go to Step 19

Go to Step 20

18

Replace the fog lamp relay. Refer to Fog Lamp Relay Replacement

Is the repair complete?

--

Go to Step 21

--

19

Repair a poor connection or open in circuit 1250.

Is the repair complete?

--

Go to Step 21

--

20

Repair a poor connection or open in circuit 122.

Is the repair compete?

--

Go to Step 21

--

21

  1. Turn the ignition switch to the OFF position.
  2. Reconnect all connectors/components removed.

Have all the repairs been made?

--

Go to Fog Lights System Check

--