GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

  1. Turn the ignition OFF.
  2. Remove the left rear turn signal lamp and inspect the filament. Refer to Tail/Turn Signal Lamp Replacement .

Is the filament open?

--

Go to Step 2

Go to Step 3

2

Replace the open lamp. Refer to Tail/Turn Signal Lamp Replacement .

Is the repair complete?

--

System OK

--

3

Connect a self powered test lamp from terminal G to ground.

Does the test lamp light?

--

Go to Step 5

Go to Step 4

4

Locate and repair the open in CKT 1750 (BLK) between the lamp and the rear lamps bussing block.

Is the repair complete?

--

System OK

--

5

Locate and repair the open in CKT 2114 (LT BLU) between lamp and the underhood bussed electrical center (UBEC).

Is the repair complete?

--

System OK

--