GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the Backup Lights System Check performed?

--

Go to Step 2

Refer to Backup Lamp System Check

2

  1. Remove the inoperative bulb.
  2. Inspect the bulb.

Is the bulb open?

--

Go to Step 3

Go to Step 4

3

Replace the bulb.

Is the repair complete?

--

Refer to Backup Lamp System Check

--

4

  1. Connect a J 39200 (DMM) between CKT 1324 (LT GRN) at the lamp socket terminal A and ground.
  2. Turn the ignition switch to the ON position.
  3. Place the transmission in REVERSE.

Does the J 39200 (DMM) display the specified value?

B+

Go to Step 6

Go to Step 5

5

Locate and repair the open in CKT 1324 (LT GRN).

Is the repair complete?

--

Refer to Backup Lamp System Check

--

6

Connect a J 39200 (DMM) between CKT 1324 (LT GRN) terminal A at the lamp socket and CKT 1350 (BLK) terminal G at the lamp socket.

Does the J 39200 (DMM) display the specified value?

B+

Go to Step 7

Go to Step 10

7

Inspect the lamp socket for damaged or corroded terminals.

Are the lamp socket terminals damaged or corroded?

--

Go to Step 8

Go to Step 9

8

Repair or replace the lamp socket as needed.

Is the repair complete?

--

Refer to Backup Lamp System Check

--

9

Replace the bulb.

Is the repair complete?

--

Refer to Backup Lamp System Check

--

10

Locate and repair the open in CKT 1350 (BLK) between the lamp socket and S427.

Is the repair complete?

--

Refer to Backup Lamp System Check

--