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.
  3. Inspect the system.

Is the symptom still present?

--

System OK

--

4

  1. Repair a poor connection or an open in CKT 451 between the engine coolant level indicator module harness connector terminal C and G113.
  2. Inspect the system.

Is the repair complete?

--

System OK

--

5

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

Is there a poor connection or an open in CKT 68?

--

Go to Step 6

Go to Step 7

6

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

Is the repair complete?

--

System OK

--

7

  1. Inspect the warning indicator bulb and bulb connection.
  2. If OK, replace the instrument cluster.
  3. Refer to Instrument Cluster Replacement .

  4. Inspect the system.

Is the repair complete?

--

System OK

--