GM Service Manual Online
For 1990-2009 cars only

Fog Lamps Always On Pont, Chevy Dom, Gulf States, Japan

Step

Action

Value(s)

Yes

No

1

Did you perform the Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

  1. Turn the ignition to the OFF position.
  2. Turn the fog lamp switch off.

Do the fog lamps remain off?

--

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3

Disconnect the fog lamp relay.

Do the fog lamps turn off?

--

Go to Step 4

Go to Step 5

4

Connect a test lamp between the fog lamp relay terminal F11 and ground. Refer to Circuit Testing in Wiring Systems.

Does the test lamp illuminate?

--

Go to Step 6

Go to Step 7

5

Repair the short to battery voltage in the supply voltage circuit of the fog lamps between the fog lamps and the fog lamp relay. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 10

--

6

  1. Disconnect the connector from the fog lamp switch.
  2. Connect a test lamp between the fog lamp relay terminal F11 and ground. Refer to Circuit Testing in Wiring Systems.

Does the test lamp illuminate?

--

Go to Step 8

Go to Step 9

7

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

Did you complete the replacement?

--

Go to Step 10

--

8

Repair the short to battery voltage in the supply voltage circuit of the fog lamps relay coil between the fog lamp switch and the fog lamp relay. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 10

--

9

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

Did you complete the replacement?

--

Go to Step 10

--

10

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 3

Fog Lamps Always On Rear Lamps - Europe

Step

Action

Value(s)

Yes

No

1

Did you perform the Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

  1. Turn the ignition to the OFF position.
  2. Turn the rear fog lamp switch off.

Do the rear fog lamps remain off?

--

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3

Repair the short to battery voltage in the rear fog lamp control circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 4

--

4

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 3