GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Backup Lights System Check?

--

Go to Step 2

Go to Backup Lamp System Check

2

  1. Disconnect the park/neutral position and backup lamp switch.
  2. Place the ignition switch in the RUN position.
  3. Connect a test lampJ 35616-200 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.

Is the repair complete?

--

Go to Backup Lamp System Check

--

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 Backup Switch Replacement in Transmission.

Is the replacement complete?

--

Go to Backup Lamp System Check

--

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 Backup Lamp System Check

--

8

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

Is the repair complete?

--

Go to Backup Lamp System Check

--