GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

1

Did you perform the Lighting System Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

  1. Turn the ignition on.
  2. Shift the gear selector lever to the REVERSE position.

Do the backup lamps turn on?

Go to Testing for Intermittent Conditions and Poor Connections in wiring systems.

Go to Step 3

3

Disconnect the park/neutral position switch.

Do the backup lamps turn off?

Go to Step 5

Go to Step 4

4

Repair a short to B+ in the backup lamps switched B+ feed . Refer to Circuit Testing in Wiring Systems.

Has the repair been made?

Go to Step 6

--

5

Adjust or repair the park/neutral position switch. Refer to Park/Neutral Position Switch Adjustment in Automatic Transaxle-4T65-E.

Did you complete the repair?

Go to Step 6

--

6

Operate the system in order to verify the repair.

Did you correct the condition?

Go to Diagnostic System Check - Lighting Systems

Go to Step 2