GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the Exterior Lights System Check performed?

--

Go to Step 2

Go to Exterior Lights System Check

2

Is the left stoplamp operative?

--

Go to Step 8

Go to Step 3

3

  1. Remove the bulb from the left taillamp connector.
  2. Connect a J 39200 DMM between the left taillamp connector, cavity G for CKT 150 (BLK), and ground.

Is continuity present?

--

Go to Step 5

Go to Step 4

4

Repair the open in CKT 150 (BLK) between the left taillamp connector and ground G400.

Is the left taillamp operative?

--

Go to Step 8

Go to Step 5

5

  1. Connect an unpowered test lamp between the left taillamp connector, cavity A for CKT 17 (WHT), and ground.
  2. Depress the brake pedal.

Does the test lamp light?

--

Go to Step 6

Go to Step 7

6

Replace the left taillamp bulb.

Is the left taillamp operative?

--

Go to Step 8

Go to Exterior Lights System Check

7

Repair the open in CKT 17 (WHT) between splice S410 and the left taillamp connector.

Are the taillamps operative?

--

Go to Exterior Lights System Check

Go to Step 9

8

Is the right taillamp operative?

--

Go to Exterior Lights System Check

Go to Step 9

9

  1. Remove the bulb from the right taillamp connector.
  2. Connect a J 39200 DMM between the right taillamp connector, cavity G for CKT 250 (BLK), and ground.

Is continuity present?

--

Go to Step 11

Go to Step 10

10

Repair the open in CKT 250 (BLK) between the right taillamp connector and ground G401.

Is the right taillamp operative?

--

Go to Exterior Lights System Check

Go to Step 11

11

  1. Connect an unpowered test lamp between the right taillamp connector, cavity A for CKT 17 (WHT), and ground.
  2. Depress the brake pedal.

Does the test lamp light?

--

Go to Step 12

Go to Step 13

12

Replace the right taillamp bulb.

Is the right taillamp operative?

--

Go to Exterior Lights System Check

Go to Step 13

13

Repair the open in CKT 17 (WHT) between splice S410 and the right taillamp connector.

Are the taillamps operative?

--

Go to Exterior Lights System Check

--