GM Service Manual Online
For 1990-2009 cars only

Step

Action

Values

Yes

No

1

Were you sent here from the Backup Lights System Check?

--

Go to Step 2

Go to Backup Lamp System Check

2

Does the vehicle have an automatic transaxle?

--

Go to Step 3

Go to Step 6

3

  1. Disconnect the park/neutral position (PNP) switch.
  2. Shift the transaxle to the PARK position.
  3. Turn the ignition switch to the ON position.

Do the backup lamps extinguish?

--

Go to Step 4

Go to Step 5

4

Adjust/replace the park/neutral position switch. Refer to Park/Neutral Position Switch Replacement in Automatic Transaxle.

Has the repair been completed?

--

Go to Backup Lamp System Check

--

5

Repair a short to B+ on the RED/BLK wire between the PNP switch and the SP450. Refer to Wiring Repairs in Wiring Systems.

Has the repair been completed?

--

Go to Backup Lamp System Check

--

6

  1. Disconnect the backup lamp switch.
  2. Shift the transaxle to the NEUTRAL position.
  3. Turn the ignition switch to the ON position.

Do the backup lamps extinguish?

--

Go to Step 7

Go to Step 8

7

Replace the backup lamp switch. Refer to Backup Lamp Switch Replacement in Lighting Systems.

Has the repair been completed?

--

Go to Backup Lamp System Check

--

8

Repair a short to B+ on the RED/BLK wire between the backup lamp switch and the SP450. Refer to Wiring Repairs in Wiring Systems.

Has the repair been completed?

--

Go to Backup Lamp System Check

--