GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2005 🢒 Park Avenue 🢒 Vehicle Control Systems 🢒 Vehicle DTC Information 🢒 Blower Motor Always On

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. This step tests for blower motor operation in the OFF setting.

    2.

  2. This step determines if the instrument panel integration module (IPM) is receiving an OFF request from the HVAC control module.

    3.

  3. The blower motor will operate at all times if the blower motor housing is shorted to ground or the blower motor control circuit is shorted to ground.

Step

Action

Value(s)

Yes

No

Schematic Reference: HVAC Schematics

Connector End View Reference: HVAC Connector End Views

DEFINITION: The blower motor is ON while the HVAC control is in the OFF position.

1

Did you perform the Diagnostic System Check - Vehicle?

--

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2

  1. Turn ON the ignition, with the engine OFF.
  2. Turn OFF the HVAC controls.

Does the blower motor operate?

--

Go to Step 3

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

3

With the scan tool, observe the Commanded Blower parameter in the Heating and Air Conditioning data list.

Does the scan tool indicate that the Commanded Blower parameter is near the specified value?

0%

Go to Step 5

Go to Step 4

4
  1. With the scan tool, command the blower motor OFF.
  2. Observe the Commanded Blower parameter.

Does the scan tool indicate that the Commanded Blower parameter is near the specified value?

0%

Go to Step 7

Go to Step 8

5

Disconnect the instrument panel integration module (IPM).

Does the blower motor continue to operate?

--

Go to Step 6

Go to Step 8

6

  1. Visually inspect the blower motor harness and connector for signs of repairable damage. Refer to Wiring Repairs in Wiring Systems.
  2. Inspect any vehicle harness routed near the blower motor for signs of damage and contact with the blower motor housing. Refer to Wiring Repairs in Wiring Systems.
  3. Inspect for poor connections at the harness connector of the blower motor control processor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 12

Go to Step 9

7

Inspect for poor connections at the harness connector of the HVAC control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 12

Go to Step 10

8

Inspect for poor connections at the harness connector of the IPM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 12

Go to Step 11

9

Replace the blower motor control processor. Refer to Blower Motor Control Processor Replacement .

Did you complete the replacement?

--

Go to Step 12

--

10

Replace the HVAC control module. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the replacement?

--

Go to Step 12

--

11

Replace the IPM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the replacement?

--

Go to Step 12

--

12

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 2