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?

--

Go to Step 2

Go to Diagnostic System Check - Instrument Cluster

2

Is the LOW COOLANT indicator on with the coolant level low?

--

Go to Diagnostic System Check - Instrument Cluster

Go to Step 3

3

  1. Disconnect the engine coolant level indicator module connector.
  2. Turn the ignition to the RUN position.
  3. Connect a 3-amp fused jumper between the engine coolant level indicator module connector terminal B and ground.

Is the low coolant warning indicator on?

--

Go to Step 4

Go to Step 7

4

Connect a 3-amp fused jumper between the engine coolant level indicator module connector terminals B and C.

Is the low coolant warning indicator on?

--

Go to Step 5

Go to Step 6

5

  1. Inspect for a poor connection at the engine coolant level indicator module connector.
  2. If the connection is OK, replace the engine coolant level indicator module. Coolant Level Module Replacement in Engine Cooling.
  3. Inspect the system.

Is the repair complete?

--

Go to Diagnostic System Check - Instrument Cluster

--

6

  1. Repair a poor connection or an open in CKT 1350 between the engine coolant level indicator module harness connector terminal C and G101.
  2. Inspect the system.

Is the repair complete?

--

Go to Diagnostic System Check - Instrument Cluster

--

7

Inspect for a poor connection or an open in CKT 68.

Did you find a poor connection or an open in CKT 68?

--

Go to Step 8

Go to Step 9

8

  1. Repair a poor connection or an open in CKT 68.
  2. Inspect the system.

Is the repair complete?

--

Go to Diagnostic System Check - Instrument Cluster

--

9

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

Is the repair complete?

--

Go to Diagnostic System Check - Instrument Cluster

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