GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was a diagnostic system check performed?

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Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

With the fog lamps turned on, test for positive battery voltage at terminal A of the fog lamp that is not working.

Is battery voltage present?

--

Go to Step 3

Go to Step 4

3

Test terminal B of the fog lamp for continuity to ground.

Is ground present?

--

Go to Step 5

Go to Step 6

4

Repair the open in CKT 34

Is the repair complete?

--

System OK

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5

Replace the fog lamp bulb.

Is the repair complete

--

System OK

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6

Repair the open in CKT 1350.

Is the repair complete?

--

System OK

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