GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 1999 🢒 Century (China) (CNG) 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Backup Lamps Always On

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 Park Neutral Position (PNP) switch connector C1.

Are the backup lamps ON?

--

Go to Step 3

Go to Step 2

2

Adjust or replace the PNP switch. Refer to Park/Neutral Position Switch Adjustment in Automatic Transaxle - 4T65E.

Has the repair been made?

--

Go to Backup Lamp System Check

--

3

Repair a short to B+ in circuit 24.

Has the repair been made?

--

Go to Backup Lamp System Check

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