GM Service Manual Online
For 1990-2009 cars only

Backup Lamps Inoperative Domestic

Step

Action

Value(s)

Yes

No

Important: Inspect for inoperative bulbs before beginning diagnostic procedure.

1

Did you perform the Lighting Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

  1. Disconnect the park/neutral position and backup lamp switch.
  2. Place the ignition switch in the RUN position.
  3. Connect a test lamp from CKT 139 (PNK) cavity C2 at the park/neutral position and backup lamp switch to ground.

Does the test lamp light?

--

Go to Step 3

Go to Step 4

3

Connect a fused jumper between CKT 139 (PNK) cavity C and CKT 24 (LT GRN) cavity F of the park/neutral position and backup lamp switch connector C2.

Does the backup lamp light?

--

Go to Step 5

Go to Step 7

4

Repair the open in CKT 139 (PNK) between the instrument panel fuse block and the park/neutral position and backup lamp switch (including TURN-B/U Fuse).

Is the repair complete?

--

Go to Step 9

--

5

Inspect the adjustment of the park/neutral position and backup lamp switch.

Is the adjustment proper?

--

Go to Step 6

Go to Step 8

6

Replace the park/neutral position and backup lamp switch. Refer to Park/Neutral Position Switch Replacement in Transmission.

Is the replacement complete?

--

Go to Step 9

--

7

Repair the open in CKT 24 (LT GRN) between the park/neutral position and backup lamp switch and splice S321.

Is the repair complete?

--

Go to Step 9

--

8

Adjust the park/neutral position and the backup lamp switch. Refer to Park/Neutral Position Switch Adjustment .

Is the repair complete?

--

Go to Step 9

--

9

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 2

Backup Lamps Inoperative VE1

Step

Action

Value(s)

Yes

No

Important: Inspect for inoperative bulbs before beginning diagnostic procedure.

1

Did you perform the Lighting Diagnostic System Check?

--

Go to Step 2

Diagnostic System Check - Lighting Systems

2

Inspect for inoperative TURN-B/U fuse #16 at I/P fuse block.

Is the fuse fucntional?

--

Go to Step 4

Go to Step 3

3

Replace the inoperative fuse.

Is the repair complete?

--

Go to Step 10

--

4

  1. Turn the ignition to the RUN position
  2. Check for B+ (battery voltage) with DMM at cavity C connector C2 of the park/neutral position switch to ground.

Is B+ (battery voltage) present?

--

Go to Step 6

Go to Step 5

5

Locate and repair OPEN in CKT 139 (PNK) between park/neutral switch and I/P fuse block.

Is the repair complete?

--

Go to Step 10

--

6

Connect DMM to cavity F connector C2 of the park/neutral switch to ground

Is B+ (battery voltage) present?

--

Go to Step 9

Go to Step 7

7

Adjust the park/neutral switch if needed Park/Neutral Position Switch Adjustment

Did the park/neutral switch require adjustment?

--

Go to Step 10

Go to Step 8

8

Replace the park/neutral switch.

Refer to Park/Neutral Position Switch Replacement in Transmissions.

Is the repair complete?

--

Go to Step 10

--

9

Locate and repair one of following faults:

    • OPEN in CKT 24 (LT GRN) between cavity F connector C2 of the park/neutral switch and S410
    • OPEN in CKT 550 (BLK) between S411 and S117

Is the repair complete?

--

Go to Step 10

--

10

Operate the system in order verify the repair.

Did you correct the condition?

--

System OK

Go to Step 2