Question about 1995 Buick Roadmaster

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Where is the blower motor control module and how do you access it?

Blower sometimes works, mostly not.

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  • Anonymous Dec 12, 2008

    no fan speed controll from high to low,when using heat or a/c

  • yadayada
    yadayada May 11, 2010

    Do you mean the speed control??

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1 Answer

It's a 1995 Buick Roadmaster. I believe it's the blower motor control module. I think it's under the passenger side dash and if I can get it out, how can I get it tested?

Posted on Oct 30, 2008

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Im trying to locate the fuse for the rear blower in my 2008 gmc arcadia, can anyone help me


RR/HVAC fuse 30amp located in the under hood fuse box. You can check it but highly doubt it's the problem . More then like it's the blower motor control module that's bad .
Circuit/System Description
The auxiliary blower motor is a variable speed fan. The HVAC control module controls the fan speed by sending a pulse width modulated signal to the auxiliary blower motor control module. The auxiliary blower motor control module varies the duty cycle across the auxiliary blower motor in relation to the pulse width modulated signal. The auxiliary blower motor speed can be adjusted from 10 percent to 90 percent duty cycle (PWM), 90 percent is high speed fan.
Watch this video for testing purpose's only , this is a front blower motor control module . Same way your back one works . GM is GM Chevy , Buick ,GMC , Cadillac .

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Missing variable control voltage on the blower fan control module on a 2008 Buick lucerne


What are you using to test this control signal ? Were you on right wire ?
Blower Motor Control Processor The blower motor control processor is an interface between the HVAC control module and the blower motor. The blower motor speed control, battery positive voltage and ground circuits enable the control processor to operate. The HVAC control module provides a pulse width modulation (PWM) signal to the control processor in order to command the blower motor speed. The processor supplies 12 volts to the blower motor through the blower motor voltage supply circuit. The control processor uses the blower motor ground as a low side control to adjust the blower motor speed.

Chevy Trailblazer EXT Blower Motor Won Turn Off The blower motor in this video don't shut off , but he show's how to test the PWM signal right !
Your blower motor control module is probably bad , or HVAC control panel is bad , or a wiring problem !

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2008 Impala blower don't work


You probably have a bad blower motor control module .First check the Batt. 4 fuse 30amp in the under hood fuse box .
Blower Motor Control Processor The blower motor control processor is an interface between the HVAC control module and the blower motor. The blower motor speed control, battery positive and ground circuits enable the control processor to operate. The HVAC control module provides a pulse width modulation (PWM) signal to the blower motor speed control processor in order to command the blower motor speed. The processor supplies 12 volts to the blower motor through the blower motor voltage supply circuit. The control processor uses the blower motor ground or low reference as a low side control to adjust the blower motor speed.

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Why does blower on A/C sometimes work and sometimes don't on my Saturn 2007 aura


Blower motor control processor would be a good guess but I'm not in the guessing business , you need to test power an grounds for lose connections or corrosion , check for DTC'S in the HVAC control panel an if none , there are three different diagnostic flow charts from Saturn service info .
Blower Motor Always On Blower Motor Inoperative Blower Motor Malfunction
Myself I'd say Blower motor malfunction flow chart !

1

Did you perform the Diagnostic System Check - Vehicle?
--
Go to Step 2
Go to Diagnostic System Check - Vehicle

2

Place the blower motor switch in each speed position.
Does the blower motor operate at the desired speeds?
yes / no
Go to Testing for Intermittent Conditions and Poor Connections
Go to Step 3

3

  1. Disconnect the harness connector of the blower motor control processor.
  2. Measure the voltage between the battery positive voltage circuit and the ground circuit of the blower motor control processor.
Does the voltage measure within the specified range?
10-14 V yes / no
Go to Step 4
Go to Step 6

4

  1. Connect the blower motor control processor.
  2. Disconnect the harness connector of the HVAC control module.
  3. Measure the voltage on the blower motor speed control circuit.
Does the voltage measure within the specified range?
4.5-5.5 V
Go to Step 7
Go to Step 5

5

Test the control circuit of the blower motor control processor for a high resistance. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?
--
Go to Step 12
Go to Step 7

6

Test the battery positive voltage circuit of the blower motor control processor for a high resistance. Refer to Circuit Testing and Wiring Repairs .
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 blower motor control processor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
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 HVAC control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?
--
Go to Step 12
Go to Step 11

9

Repair a high resistance in the ground circuit of the blower motor control processor. Refer to Circuit Testing .
Did you complete the repair?
--
Go to Step 12
--

10

Replace the blower motor control processor. Refer to Blower Motor Control Processor Replacement .
Did you complete the replacement?
--
Go to Step 12
--

11

Replace the HVAC control module. Refer to Control Module References 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
Good luck , hope this helps !

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1 Answer

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