GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Exterior Lights Schematics

1

Did you review the Exterior Lighting Systems Description and Operation and perform the necessary inspections?

Go to Step 2

Go to Exterior Lighting Systems Description and Operation

2

Verify that the backup lamps are always on.

Do the backup lamps operate normally?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3

  1. Block the wheels or set the parking brake.
  2. Turn the ignition switch to the RUN position. Do not start the engine.
  3. Disconnect the backup lamp switch (M/T) or the park/neutral position switch (A/T).

Do the backup lamps remain illuminated?

Go to Step 4

Go to Step 5

4

Replace or adjust the backup lamp switch (M/T) or the park/neutral position switch (A/T). Refer to Park/Neutral Position Switch Replacement or Park/Neutral Position Switch Adjustment in Automatic Transmission - 4L60-E.

Did you complete the repair?

Go to Step 6

--

5

Repair the short to power in the backup lamp supply voltage circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 6

--

6

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3