GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Lighting Systems Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

Place the headlamp switch in the HEAD position.

Measure voltage from RH high beam headlamp connector terminal A to ground.

Is battery voltage measured?

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Go to Step 3

Go to Step 5

3

Inspect CKT 359 for an open from RH high beam headlamp connector terminal B to connector C103 terminal G. Refer to Testing for Continuity in Wiring Systems.

Is CKT 359 OK?

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Go to Step 4

Go to Step 6

4

Repair open in CKT 750 from connector C103 terminal G to S107.

Is the repair complete?

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Go to Step 7

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5

Repair open in CKT 311 between RH high beam headlamp connector terminal A to the underhood fuse block.

Is the repair complete?

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Go to Step 7

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6

Repair open in CKT 359.

Is the repair complete?

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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