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'98deville blower motor module or just blower motor out? How test?

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See if you are getting power to the motor.

Posted on Dec 30, 2013

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Posted on Jan 02, 2017

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2 Answers

I have a 95 Buick Roadmaster D blower motor will not shut off even if the key is out


sounds like a blower motor relay or control module. have it check first with your mechanic as the part for your car is expensive. goodluck

Mar 28, 2017 | Buick Cars & Trucks

1 Answer

MY BLOWER MOTOR WAS WORKING & THEN ALL OF A SUDDEN IT STOPPED. WHY? A 2000 PONTIAC BONNEVILLE


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.

HVAC Blower Motor Circuit

Mar 24, 2017 | Pontiac Cars & Trucks

1 Answer

Heater fan runs when heater is off.06 ford expoler


Automatic or manual climate control ?
  • The blower motor does not operate correctly - manual climate control
  • Circuitry short
  • A/C blower motor resistor
  • A/C blower motor switch
  • Blower motor high speed relay
  • Go To Pinpoint Test O .

  • The blower motor does not operate correctly - EATC
  • Circuitry short/open
  • A/C blower motor speed control
  • EATC module
  • Go To Pinpoint Test Q .

Pinpoint Test Q: The Blower Motor Does Not Operate Correctly - EATC
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).
    Possible Causes
  • An open, short to voltage, ground or together in circuits CH218 (GN/VT), VH219 (GY) or circuit CH217 (BN)
  • Blower motor control module
  • EATC module
  • If automatic HVAC system i would suspect Blower motor control module .

Oct 27, 2016 | 2006 Ford Explorer

1 Answer

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 .

Oct 21, 2016 | GMC Cars & Trucks

1 Answer

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 !

Sep 26, 2016 | 2008 Buick Lucerne CXL

2 Answers

I replaced the blower, and resister on my 2012 chevy. impala but blower still don't work. What fuse do I need to check


The fuse box should be under the hood, passenger side. Try the upper box, middle right side Mine is huge, 30 amp

Sep 23, 2016 | 2012 Chevrolet Chevrolet Impala LT

1 Answer

Can anyone tell me where the fuse and/or relay is located for the blower motor on a 2005 Buick LaCrosse


First off , does it work on any speed ? After looking at a wiring diagram I find out your vehicle has a Blower motor control processor , a module ! That is your problem ,more then likely !
DEFINITION: The blower motor is inoperative in all speed positions.

1

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

2

  1. Turn ON the ignition, with the engine OFF.
  2. Place the blower switch in each speed position.
Does the blower motor operate in any of the speed positions?
--
Go to Blower Motor Malfunction
Go to Step 3

3

  1. Turn OFF the ignition.
  2. Disconnect the blower motor connector.
  3. Turn ON the ignition, with the engine OFF.
  4. Connect a test lamp between the blower motor supply voltage circuit and the blower motor control circuit.
  5. Place the blower motor switch in the minimum speed position.
Does the test lamp illuminate?
--
Go to Step 9
Go to Step 4

4

Test the battery positive voltage circuit of the blower motor control processor for the following:
?€¢
An open


?€¢
A high resistance


?€¢
A short to ground

Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?
--
Go to Step 15
Go to Step 5

5

Test the ground circuit of the blower motor control processor for an open or a high resistance. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?
--
Go to Step 15
Go to Step 6

6

Important: Ensure that the blower motor control processor connector and the HVAC control module connectors are connected during this step in order to avoid misdiagnosis.

  1. Measure the voltage from the blower motor speed control circuit at the HVAC control module to a good ground.
  2. With the ignition ON, turn the blower motor to high then to OFF.
Does the voltage measure near the specified values?
5 V OFF
1 V ON
Go to Step 10
Go to Step 7

7

  1. Turn OFF the ignition.
  2. Disconnect the HVAC control module.
  3. Turn ON the ignition, with the engine OFF.
  4. Measure the voltage from the blower motor speed control circuit of the HVAC control module to a good ground.
Does the voltage measure near the specified value?
5 V
Go to Step 11
Go to Step 8

8

Test the blower motor speed control circuit of the HVAC control module for the following:
?€¢
An open


?€¢
A short to ground


?€¢
A short to voltage

Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?
Go to Step 15
Go to Step 10
If your not familiar with trouble shooting automotive electrical circuits I suggest you take it to a ASE certified repair shop !

Jan 07, 2016 | Buick Cars & Trucks

2 Answers

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 !

Jul 11, 2015 | 2007 Saturn Aura XR Sedan

1 Answer

2004. Why is the blower motor not receiving power?


The blower motor relay in the auxiliary junction box under the hood is good ? All relays ? only one controls the blower motor ! The electronic automatic temperature control module turns it on by supplying a ground inside the module ! The 30 amp fuse for the blower motor is located in the under hood auxiliary junction box ! At the relay socket test for battery voltage at pins 30 an 86 ,power form 30amp fuse ! The other two pins 85 an 87 ,85 is circuit to the electronic temperature control module . You could test this part of the circuit too , with a test light or volt meter . But if no voltage to the blower motor ,could be the electronic temperature control module is bad ! VEHICLE RELAYS Operation Diagnosis

Jun 11, 2015 | Lincoln LS Cars & Trucks

1 Answer

2003 chevy silverado blower motor wont work i tested blower motor it works i just replaced the resistor and still dosent work, i also checked the fuses and the are ok please what else could it be


Is the blower motor not getting power or ground ?
There are two fuses that power the HVAC control module. The module controls the blower motor processor and the blend doors.
Have you tested the module and processor ?
You may need a shop manual for the wiring diagrams and procedures.

Jan 23, 2013 | 2003 Chevrolet Silverado 1500

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