GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Lighting Systems Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

  1. Turn ON the ignition.
  2. Test the fuse output-ignition circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

System OK

Go to Step 3

3

With the transmission gear selector in park, test the back-up lamp feed circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

System OK

Go to Step 4

4

  1. Set the parking brake.
  2. Put the transmission selector in reverse.
  3. Test the back-up lamp feed circuit for a short to ground. Refer to Circuit Testing in Wiring Systems.

Did you find a short to ground?

--

Go to Step 5

Go to Testing for Electrical Intermittents

5

Replace the park neutral position switch Refer to LINK in Automatic Transaxle-4T40-E/4T45-E

Did you complete the replacement?

--

System OK

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6

  1. Turn ON the ignition.
  2. Test the fuse output-ignition circuit for high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

System OK

Go to Step 7

7

With the transmission gear selector in park, test the back-up lamp feed circuit for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

System OK

Go to Step 8

8

  1. Set the parking brake.
  2. Put the transmission selector in reverse.
  3. Test the back-up lamp feed circuit for battery voltage. Refer to Circuit Testing in Wiring Systems.

Did the voltage measure to specified value?

B+

Go to Step 9

Go to Step 5

9

Test the ground circuit on each back-up bulb for an open. Refer to Circuit Testing in Wiring Systems.

Did you find and correct the condition?

--

System OK

Go to Diagnostic System Check - Lighting Systems