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

  1. Disconnect the blower motor resistor.
  2. Connect a test lamp between CKT 64 (BRN) and ground.
  3. Turn the ignition switch to the RUN position.
  4. Turn the mode selector switch to the HEAT position.

Does the test lamp light?

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Go to Step 4

Go to Step 3

3

Locate and repair the open in CKT 64 (BRN) between the blower motor resistor and S215.

Is the repair complete?

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Go to Heater Blower Controls System Check

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4

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

Is the repair complete?

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Go to Heater Blower Controls System Check

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