GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Exterior Lights System Check?

--

Go to Step 2

Go to Exterior Lights System Check

2

  1. Disconnect the inoperative bulb.
  2. Inspect the bulb.

Is the bulb open?

--

Go to Step 6

Go to Step 3

3

Connect a J 39200 digital multimeter (DMM) between cavity G at the inoperative lamp socket and ground.

Is the resistance less than the specified value?

1 ohms

Go to Step 5

Go to Step 4

4

Locate and repair the open in CKT 1350 (BLK).

Is the repair complete?

--

Go to Exterior Lights System Check

--

5

Connect a test lamp between the inoperative tail lamp socket terminal A and ground while depressing the brake pedal.

Does the test lamp light?

--

Go to Step 6

Go to Step 7

6

Replace the bulb. Refer to Bulb Replacement.

Is the repair complete?

--

Go to Exterior Lights System Check

--

7

Locate and repair the open in CKT 1320 (LT BLU).

Is the repair complete?

--

Go to Exterior Lights System Check

--