AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System) Blower Motor Circuit

DESCRIPTION

The blower motor with fan sub-assembly is operated by signals from the air conditioning control assembly. Blower motor speed signals are transmitted in accordance with changes in the duty ratio.

WIRING DIAGRAM

A004HVCE04

CAUTION / NOTICE / HINT

Note

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Air Conditioner / Active Test.

    5. Check the operation by referring to the table below.

      Air Conditioner
      Tester Display Test Part Control Range Diagnostic Note
      Blower Motor Blower motor with fan sub-assembly Min.: 0, Max.: 31 -
      Result
      Result Proceed to
      OK A
      NG (Blower motor with fan sub-assembly does not operate) B
      NG (Blower motor with fan sub-assembly operates but does not change speed) C

    A

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    C

    CHECK HARNESS AND CONNECTOR (BLOWER MOTOR FAN SUB-ASSEMBLY-BLOWER RESISTOR) Click here

    B

  2. INSPECT HEATER BLOWER MOTOR RELAY ASSEMBLY


    1. Remove the heater blower motor relay assembly.

    2. Inspect the heater blower motor relay assembly Click here.


    NG

    REPLACE HEATER BLOWER MOTOR RELAY

    OK

  3. CHECK HARNESS AND CONNECTOR (HEATER BLOWER MOTOR RELAY ASSEMBLY - AIR CONDITIONING CONTROL ASSEMBLY)


    1. Inspect the heater blower motor relay assembly.

    2. Disconnect the D19 air conditioning control assembly.

    3. A004JYPE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Air Conditioning Control Assembly)

      Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      D19-8(HR) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (BLOWER MOTOR WITH FAN SUB-ASSEMBLY - POWER SOURCE)


    1. Disconnect the A31 blower motor with fan sub-assembly.

    2. A004KYRE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Blower Motor with Fan Sub-assembly)

      Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      A31-2 - Body ground

      Ignition switch ON

      Blower switch ON

      		 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. INSPECT BLOWER MOTOR WITH FAN SUB-ASSEMBLY


    1. Reconnect the blower motor with fan sub-assembly Click here.

    2. Inspect the blower motor with fan sub-assembly Click here.


    NG

    REPLACE BLOWER FAN MOTOR ASSEMBLY

    OK

  6. CHECK HARNESS AND CONNECTOR (BLOWER MOTOR FAN SUB-ASSEMBLY-BLOWER RESISTOR)


    1. Disconnect the A27 blower resistor.

    2. A004JXTE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to blower resistor)

      Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      A27-5(D) - Body ground

      Ignition switch ON

      Blower switch ON

      		 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK HARNESS AND CONNECTOR (BLOWER MOTOR WITH FAN SUB-ASSEMBLY BODY GROUND)


    1. Disconnect the A27 air conditioning control assembly connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A27-4(S) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - BLOWER MOTOR CONTROL)


    1. Disconnect the D19 air conditioning control assembly connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A27-1(G) - D19-14(BLW) Always Below 1 Ω
      A27-3(FB) - D19-6(VM) Always Below 1 Ω
      A27-1(G) - Body ground Always 10 kΩ or higher
      A27-3(FB) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. REPLACE BLOWER MOTOR CONTROL


    1. Replace the blower motor control with a new or normally functioning one Click here.


    NEXT

  10. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Air Conditioner / Active Test.

    5. Check the operation by referring to the table below.

      Air Conditioner
      Tester Display Test Part Control Range Diagnostic Note
      Blower Motor Blower motor with fan sub-assembly Min.: 0, Max.: 31 -

    OK

    END (BLOWER MOTOR CONTROL IS FAULTY)

    NG

    REPLACE AIR CONDITIONING CONTROL ASSEMBLY Click here