GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you inspect for Powertrain Control Module DTC's?

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Go to Step 2

Go to Powertrain On Board Diagnostic (OBD) System Check (V6) or Powertrain On Board Diagnostic (OBD) System Check (V8)

2

  1. Disconnect the PCM.
  2. Disconnect the instrument cluster.
  3. Connect a DVM between the instrument cluster connector terminal B12 and the PCM connector C1 terminal 55.

Does the meter read less than 1 ohms?

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Go to Step 3

Go to Step 4

3

Inspect for a poor connection at instrument cluster terminal B12.

Did you repair a poor connection?

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Go to Instrument Cluster System Check

Go to Step 5

4

Repair the open in CKT 817 between the instrument cluster and S242.

Is the repair complete?

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Go to Instrument Cluster System Check

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5

Replace the instrument cluster. Refer to Instrument Cluster Replacement .

Is the repair complete?

--

Go to Instrument Cluster System Check

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