GM Service Manual Online
For 1990-2009 cars only

Blower Motor Always On Ignition Off

Step

Action

Value(s)

Yes

No

1

  1. Turn the ignition to the OFF position.
  2. Disconnect the blower motor connector and measure the voltage between terminal A and terminal  B at the blower control module output.

Does the voltage equal the specified value?

0 V

Go to Step 2

Go to Step 4

2

Reconnect the blower motor connector.

Does the blower motor run?

--

Go to Step 3

System OK

3

Replace the blower motor. Refer to Blower Motor and Fan Replacement

Is the repair complete?

--

System OK

--

4

Measure the voltage at terminal C of the blower control module input.

Does the voltage equal the specified value?

5 V

Go to Step 5

Go to Step 6

5

Replace the blower control module. Refer to Blower Motor Control Module Replacement

Is the repair complete?

--

System OK

--

6

Replace the instrument panel integration module. Refer to Control Assembly Replacement

Is the repair complete?

--

System OK

--