GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Backup Lights System Check ?

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Go to Step 2

Go to Backup Lamp System Check

2

  1. Disconnect the park/neutral position switch (automatic) backup lamp switch (manual) connector.
  2. Place the ignition switch in the RUN position.
  3. Connect a J 35616-200 from terminal C (automatic) or terminal B (manual) to ground.

Does the test lamp light?

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Go to Step 3

Go to Step 4

3

Connect a J 39200 DMM from the switch connector, terminal F (automatic) or terminal A (manual) to ground.

Is there continuity?

--

Go to Step 5

Go to Step 6

4

Repair the open in CKT 139 (PNK) between the instrument panel fuse block and the park/neutral position switch (automatic), backup lamp switch (manual).

Is the repair complete?

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Go to Backup Lamp System Check

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5

    • Replace the backup lamp switch (manual).
    • Replace the park/neutral position switch and the backup lamp switch (automatic).

Is the repair complete?

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Go to Backup Lamp System Check

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6

  1. Inspect for an open in CKT 24 (LT GRN) between the backup lamp switch and the backup lamps.
  2. Repair the open in CKT 24 (LT GRN), as necessary.

Did you find and correct a condition?

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Go to Backup Lamp System Check

Go to Step 7

7

Repair the open in CKT 150 (BLK) between the backup lamps and ground G401.

Is the repair complete?

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Go to Backup Lamp System Check

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