GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Has the Heater Blower Controls System Check been performed?

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Go to Step 2

Go to Heater Blower Controls System Check

2

  1. Place the ignition switch in the RUN position.
  2. Place the blower switch in the LOW position.
  3. Disconnect the connector at the blower motor resistor.
  4. Connect a DMM (volts) between the blower motor resistor connector cavity A and ground.

Is battery voltage present?

--

Go to Step 3

Go to Step 4

3

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

Is the repair complete?

--

Go to Heater Blower Controls System Check

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4

  1. Disconnect the HVAC control Module connector C2.
  2. Turn the blower switch to the Low position.
  3. Connect a DMM (continuity) between pins C and G of the HVAC control module.

Is continuity present?

--

Go to Step 5

Go to Step 6

5

Repair the open in CKT 60 (YEL) between the HVAC control module connector 2, cavity C and the blower motor resistor, cavity A. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Heater Blower Controls System Check

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6

Replace the HVAC control module. Refer to Blower Switch Replacement .

Is the repair complete?

--

Go to Heater Blower Controls System Check

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