Question about 2001 Chevrolet Malibu

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The ground wire on the control module disconnected

The ground wire on the control module became disconnected while replacing blower motor resistor and need to know where to reconnect. Is there any complete diagrams of this area?

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TThe ground wire on the control module disconnected - 660b0e1.jpghis is all that's covered by the Haynes manual,Sorry I don't have more.

Posted on Dec 11, 2009

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2 Answers

A/c blower motor works if I pull power and plug back in until I cut engine off. Then I have to repeat process


Daryl, You may want to check the blower relay/ just switch with one of same type and try and if OK, problem could be the blower motor, wires/plug loose,damaged,burnt or a faulty blower motor resistor. Second link has some trouble shooting of a overheating wire problem, that is to be common in these trucks. Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
DIY 2003 Silverado Blower Motor Resistor
Sparkys Answers Chevrolet Silverado Blower Does Not Work On Any Speed
03 Silverado heater fan problem ChevyTalk FREE Restoration and Repair Help...

Jul 19, 2016 | 2003 Chevrolet Silverado 1500

1 Answer

Front blower motor quit working replaced ignition switch,control module,resister,and blower motor but still doesnt work fuses are all good where do i look next


normally it is the resistor,( relay) then resistor module then motor.
did you test the relay(I believe located under hood, relay/fuse center), If OK check plugs and wires for melting, damage and good connection, grounds should also be checked. Use a volt ohm meter to see if you are getting any power ti motor,etc.
the first link below gives good how to diagnose blower,press the helpful button
GM Blower Motor Resistor Diagnostics by Wells

DIagnose and Replace GM blower Control Module

http://www.gmcproblems.com/tsbs/Envoy/2003

Jan 30, 2016 | 2003 GMC Envoy Xl

1 Answer

Blower stays on after key is removed, now a/c works in front once I hit the highway.


Which of these systems does your vehicle have ?
HVAC Systems - Automatic
Blower Motor Control Processor
The blower motor control processor controls the speed of the blower motor by increasing or decreasing the voltage drop on the ground side of the blower motor. The HVAC control module provides a voltage signal to the blower motor control processor over the blower motor speed control circuit. As the requested blower speed increases, the HVAC control module increases the amount of time that the speed signal is modulated to ground. As the requested blower speed decreases, the HVAC control module decreases the amount of time that the signal is modulated to ground.

HVAC Systems - Manual
Air Speed - Front Control
The blower motor forces outside air into the vehicle's interior. The vehicle operator determines the blower motor's speed when the driver places the blower switch in one of 5 blower speeds. The blower motor will always operate in any switch position other than OFF, as long as the ignition switch is in the RUN position. The blower motor and mode switches are located within the HVAC control module. The blower motor OFF input is connected in series with the HVAC control module by the off blower motor control circuit.
Depending upon the selected speed, power is provided to the blower motor from either the ignition 3 voltage or battery positive voltage circuits from the fuse block. The battery positive voltage circuit only provides power when the High blower switch position is selected. Power and ground are provided to the HVAC control module by the ignition 3 voltage and the ground circuits.
Low Blower Speed
When the Low 1 blower speed is selected, the HVAC control module applies voltage to the blower motor resistor assembly through the low blower motor control circuit. Voltage is divided between 4 series resistors, a blower relay, and the blower motor to achieve the desired blower speed. The blower motor is grounded through the ground circuit.
Medium Blower Speeds
When the Medium 1 blower speed is selected, the HVAC control module applies voltage to the blower motor resistor assembly through the medium 1 blower motor control circuit. Voltage is divided between 3 series resistors, a blower relay, and the blower motor to achieve the desired blower speed. The blower motor is grounded through the ground circuit.
When the Medium 2 blower speed is selected, the HVAC control module applies voltage to the blower motor resistor assembly through the medium 2 blower motor control circuit. Voltage is divided between 2 series resistors, a blower relay, and the blower motor to achieve the desired blower speed. The blower motor is grounded through the ground circuit.
When the Medium 3 blower speed is selected, the HVAC control module applies voltage to the blower motor resistor assembly through the medium 3 blower motor control circuit. Voltage is divided between a series resistor, a blower relay, and the blower motor to achieve the desired blower speed. The blower motor is grounded through the ground circuit.
High Blower Speed
When the High blower speed is selected, the HVAC control module applies voltage to the blower motor resistor assembly through the high blower motor control circuit. The voltage energizes the blower relay, causing the blower motor to be connected directly to the battery positive voltage circuit. The blower motor and blower motor relay are grounded through the ground circuit.

HVAC Control Module
The HVAC control module is a class 2 device that interfaces between the operator and the HVAC system to maintain air temperature and distribution settings. The battery positive voltage circuit provides power that the control module uses for keep alive memory (KAM). If the battery positive voltage circuit loses power, all HVAC DTCs and settings will be erased from KAM. The body control module (BCM), which is the vehicle mode master, provides a device on signal. The control module supports the following features:

Feb 09, 2018 | 2005 Chevrolet Tahoe

1 Answer

How to change blower motor in. 99 grand Cherokee


Check this procedure...Blower Motor Resistor and Controller Replacement


REMOVAL

1. Disconnect and isolate the batten' negative cable.

2. Depress locking tab and unplug the wire harness connector from the blower motor

resistor or controller (power module).

3. Depress locking tab and unplug the resistor or controller connector from the blower

motor.

4. Remove the 2 screws that secure the blower motor resistor or controller to the

heater-AC housing.

5. Remove the blower motor resistor or controller from the heater AC housing.


INSTALLATION

1. Install the blower motor resistor or controller to the heater AC housing. The

housing is indexed to allow (controller power module) mounting in only one

position. Tighten the mounting screws to 2.2 Nm(20 in. Lbs.).

2. Plug in the wire harness connector to the blower motor resistor or controller.

3. Plug in the connector from the blower motor resistor or controller to the blower

motor.

4. Connect the batten' negative cable.

zjlimited_1958.jpg


Hope this helps (rerember to rating this and leave a testiomonial).

Sep 30, 2011 | 1999 Jeep Grand Cherokee

1 Answer

How do i change blower motor resistor on 99 jeep grand cherokee


Welcome to FIxYa.com



Blower Motor Resistor and Controller Replacement

Image Blower Motor Resistor Or Controller/Power Module Remove/Install

REMOVAL

1. Disconnect and isolate the batten' negative cable.

2. Depress locking tab and unplug the wire harness connector from the blower motor

resistor or controller (power module).

3. Depress locking tab and unplug the resistor or controller connector from the blower

motor.

4. Remove the 2 screws that secure the blower motor resistor or controller to the

heater-AC housing.

5. Remove the blower motor resistor or controller from the heater AC housing.

INSTALLATION

1. Install the blower motor resistor or controller to the heater AC housing. The

housing is indexed to allow (controller power module) mounting in only one

position. Tighten the mounting screws to 2.2 Nm(20 in. Lbs.).

2. Plug in the wire harness connector to the blower motor resistor or controller.

3. Plug in the connector from the blower motor resistor or controller to the blower

motor.

4. Connect the batten' negative cable.

leedavidian_45.jpg



Thank you for using FixYa.com

Regards, Lee Davidian

Nov 22, 2010 | 1999 Jeep Grand Cherokee

1 Answer

The ground wire bacame disconnected and need to


On this particular vehicle the blower is supplied power all of the time. The hvac control head supplies the power to the blower resistor to operate the blower. If the wire is actually broken, you need to repair it, or obtain a manual from a local parts store to track it, If the wiring looks ok you will more than likely need to replace the control head in the dash which would be least expensive and easily obtainable at a junkyard.

Dec 11, 2009 | 2001 Chevrolet Malibu

1 Answer

Yes i have juice to the blower motor, but it dont blow all fuses are good, freon is good


Cadillac 1999 DeVille
If the front blower motor is not running with battery level power to it, you may have bad blower resistors which controls the speed of the motor.. Unfortunately the resistors are built-in the motor. You may have to replace the motor. If you remove the motor, you can recheck it by direct wiring power to it. OR you may have loose wires.
Also check the Heater and A/C Programmer module.

Here's some info I found from another posting.

Red is positive 12 volts coming from fuse of circuit breaker. The black wire is either the ground or the main hot wire going to the blower motor (3 pin connection only), and the gray wire (if is is small in size) is a variable voltage coming from the body control module requesting speed for the blower motor.The blower control module varies voltage on the main wire going to the blower motor, supposedly in accordance with the requested voltage from the body control module. Usually if all fuses are okay and present on the apprpriate wire of the blower control module, the a blower motor that will not run or stays running after the key is turned off is the fault of the blower control module. If the blower control module has failed the the cause must be determined (over amping blower motor) or else new blower control module may fail when powered up.Usually blower control modules have more than three wires. Usual connections are: B+ (battery voltage) GND (chassis or engine ground), two large wires going directly to blower motor (can be any color, but are usually 10 guage in size), and an optional wire that reports voltage level back to the body control module.

Jun 24, 2009 | 1999 Cadillac DeVille

2 Answers

Blower fan only works on high speed


Its the blower resistor. I couldn't get the pictures in sorry. Rob

RESISTOR-BLOWER MOTOR
DESCRIPTION
The blower motor resistor is mounted to the HVAC air
inlet housing, directly behind the glove box. The
blower motor resistor consists of a molded plastic
mounting plate (1) with an integral wire connector
receptacle (2). Concealed behind the mounting plate
are coiled resistor wires contained within a ceramic
heat sink (3). The blower motor resistor is accessed
for service by removing the glove box from the instrument
panel.
The blower motor resistor is accessed for service by
removing the glove box from the instrument panel.
OPERATION
The blower motor resistor is connected to the vehicle electrical system through a dedicated wire lead and connector
of the HVAC wire harness. The blower motor resistor has multiple resistor wires, each of which will reduce the
current flow through the blower motor to change the blower motor speed.
The blower motor control in the MTC heating-A/C system directs the ground path for the blower motor through the
correct resistor wire to obtain the selected speed. With the blower motor control in the lowest speed position, the
ground path for the blower motor is applied through all of the resistor wires. Each higher speed selected with the
blower motor control applies the blower motor ground path through fewer of the resistor wires, increasing the blower
motor speed.
The blower motor resistor cannot be adjusted or repaired and, if faulty or damaged (such as a cracked ceramic heat
sink), it must be replaced.

DIAGNOSIS AND TESTING
BLOWER MOTOR RESISTOR
WARNING: On vehicles equipped with airbags, disable the airbag system before attempting any steering
wheel, steering column, or instrument panel component diagnosis or service. Disconnect and isolate the
negative battery (ground) cable, then wait two minutes for the airbag system capacitor to discharge before
performing further diagnosis or service. This is the only sure way to disable the airbag system. Failure to
take the proper precautions could result in accidental airbag deployment and possible personal injury or
death.
NOTE: For circuit descriptions and diagrams, refer to the appropriate wiring information. The wiring information
includes wiring diagrams, proper wire and connector repair procedures, further details on wire harness
routing and retention, as well as pin-out and location views for the various wire harness connectors,
splices and grounds.
1. Disconnect and isolate the negative battery cable.
2. Disconnect the wire harness connector from the blower motor resistor (Refer to 24 - HEATING & AIR CONDITIONING/
CONTROLS/RESISTOR-BLOWER MOTOR - REMOVAL).
24 - 138 CONTROLS ND
3. Using an ohmmeter, check for continuity between all of the blower motor resistor terminals. In each case there
should be continuity. If OK, repair the wire harness circuits between the blower motor switch and the blower
motor resistor or blower motor as required. If not OK, replace the faulty blower motor resistor.
REMOVAL
WARNING: On vehicles equipped with airbags, disable the airbag system before attempting any steering
wheel, steering column, or instrument panel component diagnosis or service. Disconnect and isolate the
battery negative (ground) cable, then wait two minutes for the airbag system capacitor to discharge before
performing further diagnosis or service. This is the only sure way to disable the airbag system. Failure to
take the proper precautions could result in accidental airbag deployment and possible personal injury or
death.
WARNING: The blower motor resistor may get very hot during normal operation. If the blower motor was
turned on prior to servicing the blower motor resistor, wait five minutes to allow the resistor to cool before
performing diagnosis or service. Failure to take this precaution can result in personal injury or death.
1. Disconnect and isolate the negative battery cable.
2. Remove the glove box (Refer to 23 - BODY/INSTRUMENT
PANEL/GLOVE BOX - REMOVAL).
3. Disengage the wire harness connector locking tab
and disconnect the wire harness connector (1) from
the blower motor resistor (2).
4. Remove the two screws (3) that secure the blower
motor resistor to the HVAC housing (4).
5. Remove the blower motor resistor from the HVAC
housing.
INSTALLATION
1. Position the blower motor resistor (2) into the
HVAC housing (4).
2. Install the two screws (3) that secure the blower
motor resistor to the HVAC housing. Tighten the
screws to 2 N·m (17 in. lbs.).
3. Connect the wire harness connector (1) to the
blower motor resistor and engage the wire harness
connector locking tab.
4. Install the glove box (Refer to 23 - BODY/INSTRUMENT
PANEL/GLOVE BOX - INSTALLATION).
5. Reconnect the negative battery cable.


Aug 22, 2008 | 2002 Dodge Dakota Club Cab

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