GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

1

  1. Inspect the inoperative bulbs for a damaged or open filament.
  2. Check that the harness connector seals are not damaged or missing.

Are the bulbs and the harness connectors OK?

Go to Step 2

Go to Step 7

2

  1. Turn the ignition switch to the RUN position.
  2. Place the turn signal switch to the inoperative side.
  3. Using a test lamp, backprobe between the inoperative tail/stop/turn lamp harness connector terminal A to ground.

Does the test lamp flash?

Go to Step 4

Go to Step 3

3

    • LR inoperative: Using a test lamp, backprobe between the C201 terminal A4 to ground.
    • RR inoperative: Using a test lamp, backprobe between the C201 terminal A5 to ground.

Does the test lamp flash?

Go to Step 6

Go to Step 5

4

Replace the tail/stop/turn lamp. Refer to Tail Lamp Assembly and /or Backup, Sidemarker, Stop, Turn Signal Bulb Replacement .

Is the repair complete?

Go to Exterior Lights System Check

--

5

Replace the turn signal switch. Refer to Multifunction Turn Signal Lever Replacement - On Vehicle in Steering Wheel and Column - Tilt.

Is the repair complete?

Go to Exterior Lights System Check

--

6

    • LR Inoperative: Repair the poor connection or an open in circuit 18 between connector C201 terminal A4 and the left rear tail/stop/turn lamp.
    • RR inoperative: Repair the poor connection or an open in circuit 19 between connector C201 terminal A5 and the rear right tail/stop/turn lamp.

Is the repair complete?

Go to Exterior Lights System Check

--

7

Replace the damage component.

Is the repair complete?

Go to Exterior Lights System Check

--