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It's probably not going to be a fuse issue , you people have limited thinking because you have no clue how the electronic's work on your vehicles . The HVAC contol module as battery supplies yes , but control the blower motor with PWM - pulse width modulation controller .
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.
Most of the time the Blower Motor Control Processor is bad , without testing this is just a guess . Your best bet , take your vehicle to a qualified repair shop.
Instead of trying to play automotive technician replacing parts that doesn't fix the the problem , do yourself a favor an take it to a qualified repair shop. First off , looking at a wiring diagram too see what all is invovled in making the blower motor work an then testing the electrical circuit's to find the problem is what should be done , not guessing an replacing parts . Besides , this vehicle doesn't have a blower motor resistor , it has a blower motor control processor . HVAC Blower Motor Circuit
Doesn't work on any speed ? high - low . Does your's have manual or automatic climate control ?
Don't think a fuse problem , blower motor control processor more then likely .
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.
Look here for fuse location an wiring diagram's http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model an engine size. Under system click on HVAC , subsystem HVAC controls . click the search button then click on the 5th blue link . This show's fuse location an wiring diagram for the blower electrical circuit . If you don't know where the rear fuse box is ,it's under the rear seat . It would be easier to just check under the passanger side dash at the blower motor control processor at the orange wire .
Do you know how to test electrical circuits with a voltmeter ?
Blower motor control module would be a good guess , but is still just a guess . Testing the electrical circuit would need to be done to know for sure . Do you know how to test electronic's , automotive electrical circuits ?
HVAC Blower Controls Circuit Description
The blower motor is controlled by the blower control module. The blower control module receives the requested blower speed from the heater and A/C control in the form of a 5 volt pulse modulated reference signal. When low speed is requested by the heater and A/C control, the pulse width is reduced. When high blower speed is requested, the pulse width is increased. An open circuit, short to ground or short to battery on the blower speed input circuit of the blower control module will disrupt the pulse modulated reference signal. If the blower control module does not receive the pulse modulated signal, the blower motor will not operate. The blower control module receives power from the rear fuse block. The blower control module also provides a ground for the blower motor. A separate blower motor flange ground is used to limit radio frequency interference.
Why ? Does the blower work on high ? but no other speeds ! If it doesn't come on at any speed it's not the resistor . Does the vehicle have automatic climate control or manual ? Automatic doesn't have resistor , has a blower motor control processor . HVAC Blower Motor Circuit You need to test , not guess !
Fo to this site and create an account. From there you can access and download your owner manual which has the fuse diagram and other handy information.
you have a piece of solder broken off the controller of your hvac unit, causing power not to get to the blower motor it self. take test light and see if you have power at the blower motor. check and see if you have continuty or brake between the power wire at the blower motor and at the hvac control unit. if wires are good then the problem will lie in the hvac control unit. check and see if the blower is working at all speeds, if it works on some speeds thens the blower motor resistor.
REMOVE HEATER BLOWER MOTOR HOT WIRE BLOWER MOTOR IT.IF IT WORKS.YOUR AC AND HEATER CONTROL SWITCH IS FAULTY.CHECK HVAC FUSES AND CHECK BLOWER MOTOR RELAY.IF BLOWER MOTOR DONT WORK WHEN HOT WIRE REPLACE IT.IF ALL CHECK OUT GOOD.HAVE DEALERSHIP DO A DIAGNOSTIC TEST ON YOUR CLIMATE CONTROL SYSTEM.
I had the same issue. Brought it back to dealer and they replaced the blower itself. Below is the bulliten
Models: 2005 Buick Allure (Canada Only), LaCrosse 2004-2005 Pontiac Grand Prix
Supercede:
This bulletin is being revised to update Step 5 of the service procedure. Please discard Corporate Bulletin Number 05-01-39-001 (Section 01 - HVAC).
Condition
Some customers may comment on an inoperative or intermittent Heating, Ventilation and Air Conditioning (HVAC) blower motor. Others may comment that the blower motor speed may momentarily drop or that the blower motor continues to run after the key is turned off.
Cause
This condition may be caused by a voltage spike from the wiper motor. The voltage spike may cause a logic lock up in the blower motor control module that may be either momentary or permanent.
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