GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

  1. Shift the transaxle into the PARK position.
  2. Turn the ignition switch to the RUN position.
  3. Disconnect the transaxle range switch connector C1.

Did the backup lamps light?

--

Go to Step 3

Go to Step 2

2

  1. Adjust or replace the transaxle range switch. Refer to Park/Neutral Position Switch Replacement
  2. Inspect the system.

Is the repair complete?

--

System OK

--

3

  1. Repair a short to B+ on CKT 24.
  2. Inspect the system.

Is the repair complete?

--

System OK

--