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

Verify that the right low beam headlamp is inoperative.

Do the headlamps operate normally?

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

Go to Step 3

3

  1. Disconnect the headlamp RH low beam connector.
  2. Move the headlamp switch to the HEAD position.
  3. Move the multifunction switch to the LOW BEAM position.
  4. Connect a test lamp from the headlamp RH low beam connector terminal A to ground. Refer to Circuit Testing in Wiring Systems.

Does the test lamp illuminate?

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Go to Step 5

Go to Step 4

4

Locate and repair the open, high resistance or short to ground in CKT 198 (DK BLU). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Step 8

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5

Connect a test lamp from the headlamp, RH low beam connector terminal A to terminal B. Refer to Circuit Testing in Wiring Systems.

Does the test lamp illuminate?

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Go to Step 7

Go to Step 6

6

Locate and repair the open or high resistance in CKT 525 (YEL). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Step 8

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7

Replace the headlamp, RH low beam bulb. Refer to Headlamp Replacement .

Is the repair complete?

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Go to Step 8

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8

Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 3