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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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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1 Answer

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If automatic it's probably the blower motor control processor .
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, Blower motor speed signal, battery positive voltage and ground circuits enable the control processor to operate. The HVAC control module sends the commanded blower motor speed to the control processor through a 0 to 12-volt linear ramped blower motor speed control circuit. As the blower motor speed control voltage increases, the blower motor speed increases. The control processor sends the actual blower speed to the control module through a 0 to 12-volt blower motor speed signal circuit. The processor supplies 12volts 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.

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Normal Operation Under normal operation, the blower motor control module receives a 1-2 volt signal from the EATC module through circuit CH218 (GN/VT) to determine the desired blower motor speed. The EATC module receives a feedback voltage from the blower motor control module through circuit VH219 (GY) to determine actual blower motor speed. When the highest blower motor setting is selected, the EATC module sends 12 volts to the blower control module through circuit CH217 (BN).
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