GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Inspect for an open in the IP-IGN fuse in the fuse block.

Is the IP-IGN fuse in the fuse block open?

--

Go to Step 2

Go to Step 3

2

  1. Repair the short to ground in CKT 39.
  2. Inspect the system.

Is the repair complete?

--

System OK

--

3

  1. Disconnect the instrument cluster connector.
  2. Turn the ignition switch to the RUN position.
  3. Use a test light in order to probe between the instrument cluster harness connector terminal C1 and ground.

Does the test light illuminate?

--

Go to Step 4

Go to Step 5

4

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

Is the repair complete?

--

System OK

--

5

  1. Repair the poor connection or the open in CKT 39.
  2. Inspect the system.

Is the repair complete?

--

System OK

--