GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was a diagnostic system check performed?

--

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

Disconnect the fog lamp switch.

Did the fog lamps turn off?

--

Go to Step 3

Go to Step 4

3

Replace the fog lamp switch.

Is the repair complete?

--

System OK

--

4

  1. Reinstall the fog lamp switch.
  2. With the switch off, test terminal A of the switch for continuity to ground.

Is ground present?

--

Go to Step 5

Go to Step 6

5

Repair the short to ground in CKT 192. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

System OK

--

6

Remove the fog lamp relay.

Did the fog lamps turn off?

--

Go to Step 7

Go to Step 8

7

Replace the fog lamp relay.

Do the fog lamps operate?

--

System OK

--

8

Repair the short to battery voltage in CKT 34.

Is the repair complete?

--

System OK

--