GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the Heater Blower Controls System Check performed?

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Go to Step 2

Go to Heater Blower Controls System Check

2

Disconnect the blower motor relay.

Does the blower motor stop operating?

--

Go to Step 4

Go to Step 3

3

Locate and repair the short to the voltage in CKT 65 (PPL).

Is the repair complete?

--

Go to Heater Blower Controls System Check

--

4

  1. Turn the blower switch to the LOW position.
  2. Connect a test lamp between CKT 52 (ORN) and ground at the blower motor relay.

Does the test lamp light?

--

Go to Step 5

Go to Step 6

5

Locate and repair the short to voltage at CKT 52 (ORN) between the blower motor relay and the heater controller.

Is the repair complete?

--

Go to Heater Blower Controls System Check

--

6

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

Is the repair complete?

--

Go to Heater Blower Controls System Check

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