GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

Important: Check for inoperative bulbs before beginning diagnostic procedure.

1

Did you perform the Lighting Diagnostic System Check?

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Go to Step 2

Diagnostic System Check - Lighting Systems

2

Check the 15A RH headlamp fuse located in the underhood fuse block.

Is the fuse functional?

--

Go to Step 4

Go to Step 3

3

Locate possible overload in CKT 312 (TAN/WHT) between the underhood fuse block and the headlamp assembly and replace the fuse.

Is the repair complete?

--

Go to Step 7

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4

Check for continuity in CKT 312 (TAN/WHT) between between the underhood fuse block and the headlamp assembly.

Is there continuity?

--

Go to Step 6

Go to Step 5

5

Locate and repair OPEN in CKT 312 (TAN/WHT) between between the underhood fuse block and the headlamp assembly.

Is the repair complete?

--

Go to Step 7

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6

Replace inoperative headlamp assembly Sealed Beam Headlamp Replacement Headlamp Replacement

Is the repair complete?

--

Go to Step 7

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7

Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 2