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

Disconnect the park/neutral position switch connector.

Do the backup lamps turn off?

--

Go to Step 5

Go to Step 3

3

Disconnect the perimeter lighting relay.

Do the backup lamps turn off?

--

Go to Step 6

Go to Step 4

4

Repair the short to the voltage in CKT 24 (LT GRN). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Backup Lamp System Check

--

5

Replace the park/neutral position switch. Refer to Park/Neutral Position Switch Replacement in Automatic Transaxle-4T65-E or PNP Switch Replacement in Automatic Transaxle-4T80-E.

Is the repair complete?

--

Go to Backup Lamp System Check

--

6

Replace the perimeter lighting relay.

Is the repair complete?

--

Go to Backup Lamp System Check

--