GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Are all of the rear park lamps inoperable?

--

Go to Step 2

Go to Step 3

2

Repair the poor connection or an open in circuit 9 between S204 and S400.

Has the repair been made?

--

Go to Exterior Lights System Check

--

3

Is the inoperative lamp a rear tail lamp?

--

Go to Step 4

Go to Step 7

4

  1. Turn the headlamp switch to the PARK position.
  2. Using the test light, backprobe between the inoperable tail/stop/turn lamp harness connector terminal B and ground.

Does the test light illuminate?

--

Go to Step 8

Go to Step 5

5

Repair the poor connection or an open in circuit 9 between S400 and the inoperable tail/stop/turn lamp terminal B.

Has the repair been made?

--

Go to Exterior Lights System Check

--

6

Repair the poor connection or an open in circuit 350 between the inoperable component harness connector and G302.

Has the repair been made?

--

Go to Exterior Lights System Check

--

7

Using a test light, backprobe the inoperable lamp harness connector between terminal A to terminal B.

Does the test light illuminate?

--

Go to Step 9

Go to Step 6

8

Replace the tail/stop/turn lamp. Refer to Tail Lamp Bulb Replacement .

Does the test light illuminate?

--

Go to Exterior Lights System Check

--

9

Replace the rear side marker lamp. Refer to Marker Lamp Replacement - Rear Side.

Has the repair been made?

--

Go to Exterior Lights System Check

--