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 with fan motor sub-assembly speed signals are transmitted in accordance with changes in the duty ratio.

WIRING DIAGRAM

A01FPY6E10

INSPECTION PROCEDURE

Note


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

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

  • Before disconnecting the cable form the negative (-) battery terminal or replacing the air conditioning amplifier assembly, record the last operation state of the air conditioning for each transmitter. After replacement, it is necessary to perform memory registration for each transmitter Click here.

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS (BLOWER MOTOR)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

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

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

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

    B

    CHECK HARNESS AND CONNECTOR (BLOWER WITH FAN MOTOR SUB-ASSEMBLY - BODY GROUND) Click here

    C

    CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    A

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

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


    1. A01FR7DE25
      Text in Illustration
      *a

      Front view of 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
      Tester Connection Condition Specified Condition
      A32-1 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A01FR7DE26
      Text in Illustration
      *a

      Front view of harness connector

      (to Blower with Fan Motor Sub-assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A32-3 (+B) - Body ground Always 11 to 14 V

    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 N78 air conditioning amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N78-3 (BLW) - A32-2 (SI) Always Below 1 Ω
      N78-3 (BLW) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK BLOWER WITH FAN MOTOR SUB-ASSEMBLY


    1. A01FRYGE10
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Air Conditioning Amplifier Assembly)

      Reconnect the A32 blower with fan motor sub-assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      N78-3 (BLW) - Body ground Always 4.5 to 5.5 V

    NG

    REPLACE BLOWER WITH FAN MOTOR SUB-ASSEMBLY Click here

    OK

  6. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. A01FUWNE02
      Text in Illustration
      *a

      Component with harness connected

      (Air Conditioning Amplifier Assembly)

      Remove the air conditioning amplifier assembly Click here.

    2. Reconnect the air conditioning amplifier assembly connector.

    3. Turn the power switch on (IG).

    4. Turn the blower switch on Lo.

    5. Measure the waveform between terminal N78-3 (BLW) of the air conditioning amplifier assembly and body ground.

      OK
      Waveform is similar to that shown in the illustration.

      Tech Tips

      The waveform varies with the blower speed.

      Item Content

      Terminal No.

      (Symbol)

      		 N78-3 (BLW) - Body ground
      Tool setting 1 V/DIV., 500 μs/DIV.
      Vehicle condition

      Power switch on (IG)

      Blower switch: Lo

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    OK

    REPLACE BLOWER WITH FAN MOTOR SUB-ASSEMBLY Click here