GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Inspect the GAUGES fuse in the Fuse Block.

Is the fuse open?

--

Go to Step 2

Go to Step 3

2

  1. Locate and repair the source of the overload in CKT 39 (PNK).
  2. Replace the GAUGES fuse in the Fuse Block.

Is the repair complete?

--

System OK

--

3

Inspect G 104.

Is it clean and tight?

--

Go to Step 5

Go to Step 4

4

Repair G 104 as necessary.

Is the repair complete?

--

System OK

--

5

  1. Disconnect the engine coolant level switch connector.
  2. Install a fused jumper wire between cavity A and cavity B of the engine coolant level switch connector. Refer to Using Fused Jumper Wires in Wiring Systems.
  3. Turn the ignition switch to the RUN position.

Does the LOW COOLANT indicator illuminate in the instrument cluster?

--

Go to Step 13

Go to Step 6

6

  1. Disconnect the fused jumper wire from the engine coolant level sensor.
  2. Connect a test light from the engine coolant level switch connector, cavity A to ground.

Does the test light illuminate?

--

Go to Step 10

Go to Step 7

7

  1. Use a test light to backprobe the instrument cluster connector, cavity 25 to ground.
  2. Turn the ignition switch to the RUN position.

Does the test light illuminate?

--

Go to Step 8

Go to Step 9

8

Repair the open in CKT 68 (YEL/BLK) between the instrument cluster connector, cavity 25 and the engine coolant level switch connector, cavity A.

Is the repair complete?

--

System OK

--

9

Connect a test light from the instrument cluster connector, cavity 22 to ground.

Does the test light illuminate?

--

Go to Step 14

Go to Step 11

10

Connect a test light from the engine coolant level switch connector, cavity B to B +.

Does the test light illuminate?

--

Go to Step 13

Go to Step 12

11

Locate and repair the open in CKT 39 (PNK) between the instrument cluster connector, cavity 22 and the GAUGES fuse, cavity J 7.

Is the repair complete?

--

System OK

--

12

Locate and repair the open in CKT 150 (BLK) between the engine coolant level switch connector, cavtiy B and G 104.

Is the repair complete?

--

System OK

--

13

Replace the coolant level sensor. Refer to Coolant Level Sensor Replacement in Engine Cooling.

Is the repair complete?

--

System OK

--

14

Replace the instrument cluster.

Is the repair complete?

--

System OK

--