GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

1

Was the HVAC System Check performed?

Go to Step 2

Go to HVAC System Check

2

  1. Turn the ignition switch to the ON position.
  2. Move the blower speed selector switch to the LOW position.
  3. Backprobe the connector of the blower motor resistor with a test lamp from terminal 4 to ground.

Does the test lamp light?

Go to Step 3

Go to Step 6

3

Test for an open in the PNK wire between the blower motor resistor and S232.

Is an open present?

Go to Step 4

Go to Step 5

4

Repair the open in the PNK wire between the blower motor resistor and S232. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to HVAC System Check

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5

Replace the blower motor resistor. Refer to Blower Motor Resistor Replacement .

Is the repair complete?

Go to HVAC System Check

--

6

Replace the blower speed selector switch. Refer to Control Assembly Replacement .

Is the repair complete?

Go to HVAC System Check

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