GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

With the mode selector in the ON position and the blower selector in the medium-3 position, test the blower switch output-high circuit at the blower resistor for continuity to ground. Refer to Circuit Testing in Wiring Systems.

Is ground present?

--

Go to Step 2

Go to Step 3

2

Test the blower switch output-high circuit at the blower motor for continuity to ground Refer to Circuit Testing in Wiring Systems.

Is ground present?

--

--

Go to Step 4

3

Replace the blower resistor Refer to Blower Motor Resistor Replacement .

Is repair complete?

--

System OK

--

4

Repair the open in the blower switch output-high circuit. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

System OK

--