GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

DEFINITION: Tht left low beam headlamp does not operate, but there is no problem with the right low beam headlamp.

1

Review the headlamp operation and perform the necessary inspections.

Did you complete the system review and inspection?

--

Go to Step 2

Go to Symptoms

2

Attempt to operate the headlamps.

Does the left low beam operate normally?

--

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

Go to Step 3

3

  1. Turn on the headlamps
  2. Select high beam operation.

Does the left high beam headlamp operate?

--

Go to Step 4

Go to Headlamps Inoperative - Left Low and High Beam

4

  1. Disconnect the left low beam headlamp connector.
  2. Place the headlamp switch in the headlamp position.
  3. Select low beam on the headlamp dimmer switch.
  4. Test the voltage at the left low beam headlamp input (TAN).

Is battery voltage available at the left low beam headlamp input terminal?

B+

Go to Step 6

Go to Step 5

5

Repair the open CKT 12 (TAN).

Did you complete the repair?

--

Go to Step 7

--

6

Replace the left low beam headlamp.

Did you complete the repair?

--

Go to Step 7

--

7

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 3