GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the instrument cluster diagnostic system check?

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Go to Step 2

Go to Diagnostic System Check - Instrument Cluster

2

  1. Install a Scan Tool .
  2. Turn the ignition switch to the RUN position.
  3. WOW the instrument cluster on.

Does the engine coolant indicator come on when commanded?

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Go to Step 3

Go to Step 4

3

  1. Using the Scan Tool .
  2. WOW the instrument cluster off.

Does the indicator turn off when commanded?

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Go to Powertrain On Board Diagnostic (OBD) System Check in Engine Controls - 3.1L or Powertrain On Board Diagnostic (OBD) System Check in Engine Controls - 3.8L

Go to Step 4

4

  1. Replace the instrument cluster. Refer to Instrument Cluster Replacement .
  2. Inspect the system.

Is the repair complete?

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System OK

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