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

DESCRIPTION

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

WIRING DIAGRAM

Figure 1. except Taiwan:

A01V851E01
*a from Battery
*b Duty Control
*c Blower with Fan Motor Sub-assembly
*d Air Conditioning Amplifier Assembly

Figure 2. for Taiwan:

A01V851E02
*a from Battery
*b Duty Control
*c Blower with Fan Motor Sub-assembly
*d Air Conditioning Amplifier Assembly

CAUTION / NOTICE / HINT

Note


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

  • When the battery is disconnected or the air conditioning amplifier assembly is replaced, be sure to perform servo motor initialization.

    Click here

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.


      Body Electrical > Air Conditioner > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Blower Motor Blower with fan motor sub-assembly Min.: 0, Max.: 31 -

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Blower Motor
      Result
      Result Proceed to
      OK A
      NG (Blower with fan motor sub-assembly does not operate) B
      NG (Blower with fan motor sub-assembly operates but does not change speed) C

    A

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    C

    GO TO STEP 6 Click here

    B

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


    1. A01VAOJC04
      *A except Taiwan
      *B for Taiwan
      *a

      Front view of wire harness connector

      (to Blower with Fan Motor Sub-assembly)

      Disconnect the blower with fan motor sub-assembly connector.

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

      Standard Resistance
      except Taiwan
      Tester Connection Condition Specified Condition
      G54-1 (GND) - Body ground Always Below 1 Ω
      for Taiwan
      Tester Connection Condition Specified Condition
      G203-3 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (BLOWER WITH FAN MOTOR SUB-ASSEMBLY - BATTERY)


    1. A01VAOJC05
      *A except Taiwan
      *B for Taiwan
      *a

      Front view of wire harness connector

      (to Blower with Fan Motor Sub-assembly)

      Disconnect the blower with fan motor sub-assembly connector.

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

      Standard Voltage
      except Taiwan
      Tester Connection Condition Specified Condition
      G54-3 (+B) - Body ground Always 11 to 14 V
      for Taiwan
      Tester Connection Condition Specified Condition
      G203-1 (+B) - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - BLOWER WITH FAN MOTOR SUB-ASSEMBLY)


    1. Disconnect the G81 air conditioning amplifier assembly connector.

    2. Disconnect the G54*1 or G203*2 blower with fan motor sub-assembly connector.


      • *1: except Taiwan

      • *2: for Taiwan

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

      Standard Resistance
      except Taiwan
      Tester Connection Condition Specified Condition
      G81-22 (BLW) - G54-2 (SI) Always Below 1 Ω
      G81-22 (BLW) - Body ground Always 10 kΩ or higher
      for Taiwan
      Tester Connection Condition Specified Condition
      G81-22 (BLW) - G203-2 (SI) Always Below 1 Ω
      G81-22 (BLW) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK BLOWER WITH FAN MOTOR SUB-ASSEMBLY


    1. A01V8B0C02
      *a

      Rear view of wire harness connector

      (to Air Conditioning Amplifier Assembly)

      Disconnect the air conditioning amplifier assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      G81-22 (BLW) - Body ground Always 4.5 to 5.5 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE BLOWER WITH FAN MOTOR SUB-ASSEMBLY Click here

    OK

  6. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

    A01V8FYC04
    *a

    Component with harness connected

    (Air Conditioning Amplifier Assembly)

    1. Remove the air conditioning amplifier assembly with its connectors still connected.

      Click here

    2. Turn the ignition switch to ON.

    3. Turn the blower switch LO.

    4. Measure the waveform of the air conditioning amplifier assembly connector.

      OK
      Waveform is similar to that shown in the illustration.

      Tech Tips

      The waveform varies with the blower speed.

      Item Content
      Tester Connection G81-22 (BLW) - Body ground
      Tool setting 1 V/DIV., 500 μs/DIV.
      Vehicle condition

      Ignition switch ON

      Blower switch LO
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE BLOWER WITH FAN MOTOR SUB-ASSEMBLY Click here

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here