Question about 2006 Chevrolet Trailblazer

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I am having issues with the blower motor on my 2006 trailblazer continuing to run when the car is shut off and draining my battery. It also only works sporadically when the car is running.

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  • Chevrolet Master
  • 17,970 Answers

The issue with the blower motor running with ignition to off is either the blower motor resistor if manual climate control or the blower motor control module; if you have the Automatic Climate Control (ACC) system, the blower motor high speed relay is included on these components and no longer a separate component so when it shorts the blower motor stays on even with ignition to OFF since one side of the relay coil is hot at all times or tied directly to the battery supply and not via the ignition switch.

I am having issues with - 8ecf74d.jpg

Fig. Exploded view of the auxiliary blower motor (3) and related components-body VIN type 3 shown


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Fig. View of the auxiliary blower motor (1), HVAC module (2) and related components-body VIN type 6 shown

BLOWER MOTOR RESISTOR
DESCRIPTION
A blower motor resistor is used on this model when it is equipped with the manual heater-A/C control. Models equipped with the optional Automatic Temperature Control (ATC) use a blower power module, instead of the blower motor resistor. The
blower motor resistor is installed in a mounting hole in the heater/AC housing, directly behind the glove box opening of the instrument panel. The resistor consists of a molded plastic mounting plate with two integral connector receptacles. Concealed behind the mounting plate within the heater/AC housing are four coiled resistor wires contained within a protec-tive stamped steel cage. The resistor mounting plate
is secured with two screws to the heater/AC housing and is accessed for service by rolling down the glove box from the instrument panel.

The blower motor resistor wires will get hot when in use. Do not touch the resistor wires or the protec-tive cage if the blower motor has been running. The blower motor resistor cannot be adjusted or repaired and, if faulty or damaged, it must be replaced.

OPERATION
The blower motor resistor is connected to the vehicle electrical system through a dedicated take out and connector of the instrument panel wire harness.
A second connector receptacle receives the pigtail wire connector from the blower motor. 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 switch in the manual heater-A/C control directs the ground path for the blower motor through the correct resistor wire to obtain the selected speed. With the blower motor switch in the lowest speed position, the ground path for the motor is applied through all of the resistor wires. Each
higher speed selected with the blower motor switch applies the blower motor ground path through fewer of the resistor wires, increasing the blower motor speed. When the blower motor switch is in the high-est speed position, the blower motor resistor wires are bypassed and the blower motor receives a direct path to ground through the blower motor switch. The blower motor resistor may be diagnosed using con-ventional
diagnostic tools and methods.

DIAGNOSIS AND TESTING - BLOWER MOTOR RESISTOR
Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire harness routing and retention, connector pin-out information and location views for the various wire harness connectors, splices and grounds.
1. Disconnect and isolate the battery negative cable.
2. Disconnect the instrument panel wire harness connector for the blower motor resistor and the blower motor pigtail wire connector from the resistor connector receptacles.
3. Check for continuity between each of the blower motor switch input terminals of the blower motor resistor and the resistor output terminal. In each case there should be continuity. If OK, repair the instrument panel wire harness circuits between the blower motor switch and the blower motor resistor or the blower motor pigtail wires as required. If not OK, replace the faulty blower motor resistor.

REMOVAL
WARNING: THE BLOWER MOTOR RESISTOR MAY GET VERY HOT DURING NORMAL OPERATION. IF THE BLOWER MOTOR WAS TURNED ON, WAIT FIVE MINUTES TO ALLOW THE BLOWER MOTOR RESISTOR TO COOL BEFORE PERFORMING DIAG-NOSIS OR SERVICE. FAILURE TO TAKE THIS PRE-CAUTION CAN RESULT IN PERSONAL INJURY.

CAUTION: Do not operate the blower motor with the blower motor resistor removed from the circuit.
Failure to take this precaution can result in vehicle damage.
1. Disconnect and isolate the battery negative cable.
2. Open the glove box.
3. Flex both sides of the glove box bin inward near the top far enough for the rubber glove box stop bumpers to clear the sides of the glove box opening, then roll the glove box downward.
4. Reach through the glove box opening to access and disconnect the instrument panel wire harness connector for the blower motor resistor from the resistor connector receptacle
5. Reach through the glove box opening to access and disconnect the blower motor pigtail wire connector from the resistor connector receptacle.
6. Remove the two screws that secure the blower motor resistor to the evaporator housing.
7. Remove the blower motor resistor from the evaporator housing.

INSTALLATION
CAUTION: Do not operate the blower motor with the blower motor resistor removed from the circuit.
Failure to take this precaution can result in vehicle:
1. Position the blower motor resistor into the evaporator housing.
2. Install and tighten the two screws that secure the blower motor resistor to the evaporator housing. Tighten the screws to 2 N•m (17 in. lbs.).
3. Reconnect the blower motor pigtail wire connector to the blower motor resistor connector recep-tacle.
4. Reconnect the instrument panel wire harness connector for the blower motor resistor to the resistor connector receptacle.
5. Flex both sides of the glove box bin inward near the top far enough for the rubber glove box stop bumpers to clear the sides of the glove box opening, then roll the glove box upward.
6. Close and latch the glove box.
7. Reconnect the battery negative cable.


continue...

Posted on Sep 01, 2010

  • ZJ Limited
    ZJ Limited Sep 01, 2010

    POWER MODULE
    - DESCRIPTION



    A blower power module is used on this model when
    it is equipped with the optional Automatic Temperature
    Control (ATC). Models equipped with
    the standard manual heater-A/C control use a blower
    motor resistor, instead of the blower power module. The blower power module is installed in a mounting
    hole in the evaporator housing, directly behind the
    glove box opening of the instrument panel. The module
    consists of a molded plastic mounting plate with
    two integral connector receptacles. Concealed behind
    the mounting plate within the evaporator housing is
    the power module electronic circuitry and a large
    finned, heat sink. The module mounting plate is
    secured with two screws to the evaporator housing
    and is accessed for service by rolling down the glove
    box from the instrument panel.


    The power module heat sink will get hot when in
    use. Do not touch the heat sink if the blower motor


    has been running. The blower power module cannot
    be adjusted or repaired and, if faulty or damaged, it
    must be replaced.


    OPERATION


    The blower power module is connected to the vehicle
    electrical system through a dedicated take out


    and connector of the instrument panel wire harness.
    A second connector receptacle receives the pigtail
    wire connector from the blower motor. The blower
    power module allows the microprocessor-based Automatic
    Temperature Control (ATC) heater-A/C control
    module to calculate and provide infinitely variable
    blower motor speeds based upon either manual
    blower switch input or the ATC programming using a
    Pulse Width Modulated (PWM) circuit strategy. The
    PWM voltage is applied to a comparator circuit
    which compares the PWM signal voltage to the
    blower motor feedback voltage. The resulting output
    drives the power module circuitry, which adjusts the
    voltage output received from the blower motor relay
    to change or maintain the desired blower speed. The
    blower power module is diagnosed using a DRB
    scan tool. Refer to the appropriate diagnostic infor-mation.
    1. Disconnect and isolate the battery negative
    cable.


    2. Open the glove box.

    3. Flex both sides of the glove box bin inward
    near the top far enough for the rubber glove box stop


    bumpers to clear the sides of the glove box opening,
    then roll the glove box downward.

    4. Reach through the glove box opening to access
    and disconnect the instrument panel wire harness


    connector for the power module from the module connector
    receptacle.

    5. Reach through the glove box opening to access
    and disconnect the blower motor pigtail wire connector
    from the power module connector receptacle.
    6. Remove the two screws that secure the power
    module to the evaporator housing.

    7. Remove the power module from the evaporator
    housing.



    INSTALLATION


    WARNING: ON VEHICLES EQUIPPED WITH AIR-BAGS,
    DISABLE THE AIRBAG SYSTEM BEFORE
    ATTEMPTING ANY STEERING WHEEL, STEERING
    COLUMN, OR INSTRUMENT PANEL COMPONENT
    DIAGNOSIS OR SERVICE. DISCONNECT AND ISO-LATE
    THE BATTERY NEGATIVE (GROUND) CABLE,
    THEN WAIT TWO MINUTES FOR THE AIRBAG SYSTEM
    CAPACITOR TO DISCHARGE BEFORE PER-FORMING
    FURTHER DIAGNOSIS OR SERVICE. THIS
    IS THE ONLY SURE WAY TO DISABLE THE AIRBAG
    SYSTEM. FAILURE TO TAKE THE PROPER PRE-CAUTIONS
    COULD RESULT IN ACCIDENTAL AIR-BAG
    DEPLOYMENT AND POSSIBLE PERSONAL
    INJURY.

    1. Position the power module into the evaporator
    housing.

    2. Install and tighten the two screws that secure
    the power module to the evaporator housing. Tighten


    the screws to 2 N•m (18 in. lbs.).

    3. Reconnect the blower motor pigtail wire con-nector
    to the power module connector receptacle.

    4. Reconnect the instrument panel wire harness
    connector for the power module to the module connector
    receptacle.

    5. Flex both sides of the glove box bin inward
    near the top far enough for the rubber glove box stop


    bumpers to clear the sides of the glove box opening,
    then roll the glove box upward.

    6. Close and latch the glove box.

    7. Reconnect the battery negative cable.

    Hope this helps.

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  • Master
  • 1,874 Answers

Check up in the Fuse / Relay Block Underhood the Cooling Fan acting Relays. Remove each relay and inspect for burned pins. Replace bad relay(s) and test the car again. In the most cases fan relays are out of order, with internal contacts solded in "ON" position of the blower motor (fan). Therefore blower motor continuing to run when the car is shut off and draining the battery.

Posted on Sep 08, 2010

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1 Answer

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Suspect shorted blower motor resistor assembly. You can disconnect it and the heater will shut off. It may also small burned or the plug may look hot/melted. Here is a picture as to where it is

heater-will-not-stop-running-gqg4vunrfuiyclyu35odixpe-5-0.gif

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