GM Service Manual Online
For 1990-2009 cars only

Low Coolant Warning Message Inoperative

Step

Action

Value(s)

Yes

No

1

  1. Disconnect the engine coolant level indicator switch.
  2. Turn the ignition switch to the ON position.

Does the Low Coolant Warning message display on the Driver Information Center?

--

Go to Step 2

Go to Step 3

2

Replace the engine coolant level indicator switch.

Is the repair complete?

--

Recheck Low Coolant Warning Operation

--

3

  1. Disconnect the underhood electrical center connector C3 and C2.
  2. Coolant level indicator switch connector still disconnected.
  3. Connect a DMM between terminal D9 of the underhood electrical center connector C3 and ground.
  4. Measure CKT 68 for continuity to ground.

Is CKT 68 continuous to ground?

--

Go to Step 4

Go to Step 5

4

Locate and repair a short to ground in CKT 68 between terminal D9 of the underhood electrical center connector C3 and terminal A of the coolant level indicator switch connector.

Is the repair complete?

--

Recheck Low Coolant Warning Operation

--

5

  1. Disconnect the instrument cluster connector.
  2. Underhood electrical center connector C2 still disconnected.
  3. Connect a DMM between terminal F7 of the underhood electrical center connector C2 and ground.
  4. Measure CKT 68 for continuity to ground.

Is CKT 68 continuous to ground?

--

Go to Step 6

Go to Step 7

6

Locate and repair a short to ground in CKT 68 between terminal F7 of the underhood electrical center connector C2 and terminal A8 of the instrument cluster connector.

Is the repair complete?

--

Recheck Low Coolant Warning Operation

--

7

Replace the instrument cluster.

Is the repair complete?

--

Recheck Low Coolant Warning Operation

--