GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

1

Did you perform the Heater Blower Controls System Check?

Go to Step 2

Go to HVAC System Check

2

Test for an open in the BLK/WHT wire between the blower speed selector switch and S200.

Is an open found?

Go to Step 4

Go to Step 3

3

Replace the blower speed selector switch. Refer to Blower Switch Replacement .

Is the repair complete?

Go to HVAC System Check

--

4

Repair the open. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to HVAC System Check

--