GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

  1. Disconnect the engine coolant level indicator module connector.
  2. Turn the ignition to RUN.
  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 2

Go to Step 5

2

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 3

Go to Step 4

3

  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. Refer to Coolant Level Module Replacement in Engine Cooling.

Is the repair complete?

--

System OK

--

4

Repair a poor connection or an open in CKT 1050 between the engine coolant level indicator module harness connector terminal C and G117.

Is the repair complete?

--

System OK

--

5

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 6

Go to Step 7

6

Repair a poor connection or an open in CKT 68.

Is the repair complete?

--

System OK

--

7

Replace the instrument cluster.

Refer to Instrument Cluster Replacement .

Is the repair complete?

--

System OK

--