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For 1990-2009 cars only
Makes 🢒 Buick 🢒 1999 🢒 Park Avenue 🢒 HVAC 🢒 HVAC Systems - Automatic 🢒 Blower Motor Inoperative at Any Speed

Blower Motor Inoperative at Any Speed for Buick Park Avenue 1999

Step

Action

Value(s)

Yes

No

1
  1. Disconnect the blower motor connector.
  2. Turn the ignition to the ON position.
  3. Turn the blower speed to HIGH.
  4. Measure the voltage between blower motor connector terminal A and ground.

Refer to Measuring Voltage in Wiring Systems.

Does the voltage equal the specified value?

12 V

Go to Step 2

Go to Step 4

2

Measure the voltage between blower control module output connector terminal A and terminal B.

Refer to Measuring Voltage in Wiring Systems.

Does the voltage equal the specified value?

12 V

Go to Step 3

Go to Step 5

3
  1. Inspect the blower motor connector terminals for proper contact. Refer to Intermittents and Poor Connections Diagnosis in Wiring Systems.
  2. If the terminal contact is OK, replace the blower motor. Refer to Blower Motor and Fan Replacement

Is the repair complete?

--

System OK

--

4

Measure the voltage between blower control module input connector terminal B and ground.

Refer to Measuring Voltage in Wiring Systems.

Does the voltage equal the specified value?

12 V

Go to Step 10

Go to Step 8

5

Measure the voltage between blower control module input connector terminal C and ground.

Refer to Measuring Voltage in Wiring Systems.

Does the voltage equal the specified value?

5 V

Go to Step 6

Go to Step 12

6

Measure the voltage at the HVAC programmer connector for the HVAC blower control output.

Refer to Measuring Voltage in Wiring Systems.

Does the voltage equal the specified value?

5 V

Go to Step 7

Go to Step 11

7

Replace the HVAC programmer. Refer to Programmer Replacement

Is the repair complete?

--

System OK

--

8

Inspect positive battery feed to blower control module for open or a blown fuse for cell 10, blower motor fuse.

Is the repair complete?

--

System OK

If fuse blows after replacement

Go to Step 10

Go to Step 9

9

Check ground supply to blower control module for open.

Is the repair complete?

--

System OK

--

10

Replace the blower control module. Refer to Blower Motor Control Module Replacement

Is the repair complete?

--

System OK

--

11

Inspect the blower speed input circuit from the HVAC control assembly for open.

Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

System OK

--

12
  1. Turn the ignition off.
  2. Disconnect the blower control module input connector.
  3. Measure for short on the blower control module connector from pin C to pin A.

Refer to Testing for Short to Ground in Wiring Systems.

Is a short present?

--

Go to Step 13

Go to Step 10

13

Inspect the blower speed output circuit from the HVAC control assembly to the blower control module for short to ground.

Is the repair complete?

--

System OK

Go to Step 7