GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the entire Defogger System Check performed?

--

Go to Step 2

Go to Defogger System Check

2

  1. Turn the ignition switch to the OFF position.
  2. Disconnect the HVAC control connector C4.
  3. Turn the ignition switch to the RUN position.

Is the rear defogger on?

--

Go to Step 3

Go to Step 4

3

Repair the short to B+ in circuit 293.

Is the repair complete?

--

Go to Step 5

--

4

Replace the HVAC control. Refer to Control Assembly Replacement

Is the repair complete?

--

Go to Step 5

--

5

  1. Turn the ignition switch to the OFF position.
  2. Reconnect all connectors/components removed.

Have all the repairs been made?

--

Go to Defogger System Check

--