GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Instrument Cluster System Check?

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Go to Step 2

Go to Instrument Cluster System Check

2

  1. Engage the parking brakes.
  2. Place the ignition switch in the RUN position.
  3. Move the shift lever between all of the gear positions.
  4. Observe the shift lever indicators.
  5. Place the shift lever in the PARK position.

Do some of the indicators illuminate?

--

Go to Step 6

Go to Step 3

3

  1. Disconnect the instrument cluster.
  2. Connect a test lamp from the instrument cluster connector CKT 1020 (PNK) cavity B10 to ground.

Does the test lamp light?

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Go to Step 4

Go to Step 5

4

  1. Disconnect the park/neutral position and backup lamp switch.
  2. Connect a self-powered test lamp between CKT 651 (BLK/WHT) connector C2 cavity D and ground.

Does the test lamp light?

--`

Go to Step 6

Go to Step 7

5

Repair the open in CKT 1020 (PNK) between the instrument panel (IP) fuse block and the instrument cluster.

Is the repair complete?

--

Go to Instrument Cluster System Check

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6

  1. Place the ignition switch in the OFF position.
  2. Disconnect the instrument cluster.
  3. Use a DMM to test for continuity between the instrument cluster and the park/neutral position and backup lamp switch.
  4. Inspect for continuity between the instrument cluster and ground on the following wires:
  5. • CKT 776 (WHT)
    • CKT 773 (GRY)
    • CKT 772 (YEL)
    • CKT 771 (BLK/WHT)

Is 1 or more wire open or shorted to ground?

--

Go to Step 9

Go to Step 8

7

Repair the open in CKT 651 (BLK/WHT) between the park/neutral position and backup lamp switch and S117.

Is the repair complete?

--

Go to Instrument Cluster System Check

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8

  1. Reconnect the instrument cluster.
  2. Place the ignition switch in the RUN position.
  3. Connect from 2 to 4 fused jumper wires from the listed transmission range selector to ground as shown by the X .
  4. Repeat this procedure for each transmission range column.

Are the I/P indicators correct as tested?

--

Go to Step 11

Go to Step 10

9

Repair the opens and/or shorts to ground in the following circuits between the instrument cluster and the park/neutral position and backup lamp switch:

    • CKT 776 (WHT)
    • CKT 773 (GRY)
    • CKT 772 (YEL)
    • CKT 771 (BLK/WHT)

Is the repair complete?

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Go to Instrument Cluster System Check

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10

Replace the instrument cluster. Refer to Instrument Cluster Replacement .

Is the repair complete?

--

Go to Instrument Cluster System Check

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11

Replace the park/neutral position and backup lamp switch.

Is the repair complete?

--

Go to Instrument Cluster System Check

Go to Instrument Cluster System Check