AIR CONDITIONING SYSTEM Blower Motor Circuit

DESCRIPTION

The blower motor is operated by signals from the A/C amplifier. Blower motor speed signals are transmitted in accordance with changes in the duty ratio.

WIRING DIAGRAM

A01CEJSE04

INSPECTION PROCEDURE

PROCEDURE


  1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / 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 Min.: 0, Max.: 31 -
      OK
      Blower motor operates and blower motor speed level changes.
      Result
      Result Proceed to
      OK A
      NG (Blower motor does not operate) B
      NG (Blower motor operates but does not change speed) C

    B

    INSPECT FUSE (HTR) Click here

    C

    INSPECT A/C AMPLIFIER Click here

    A

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

  2. INSPECT FUSE (HTR)


    1. Remove the HTR fuse from the fusible link block.

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

      Standard Resistance
      Tester Item Condition Specified Condition
      HTR fuse Always Below 1 Ω

    NG

    REPLACE FUSE (HTR)

    OK

  3. CHECK HARNESS AND CONNECTOR (BLOWER MOTOR - BODY GROUND)


    1. A01CGF1E03

      Disconnect the blower motor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G30-1 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (BLOWER MOTOR - BATTERY)


    1. A01CGF1E04

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      G30-3 (+B) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (BLOWER MOTOR - A/C AMPLIFIER)


    1. A01CFVOE46

      Disconnect the A/C amplifier connector.

    2. A01CGF1E05

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G33-23 (BLW) - G30-2 (SI) Always Below 1 Ω
      G33-23 (BLW) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. INSPECT BLOWER MOTOR


    1. Reconnect the blower motor connector.

    2. A01CFVOE46

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      G33-23 (BLW) - Body ground Always 4.5 to 5.5 V

    NG

    REPLACE BLOWER MOTOR Click here

    OK

  7. INSPECT A/C AMPLIFIER


    1. A01CF4YE09

      Remove the A/C amplifier.

    2. Reconnect the A/C amplifier connector.

    3. Turn the engine switch on (IG) .

    4. Turn the blower switch on (LO).

    5. Measure the waveform between terminal G33-23 (BLW) of the A/C amplifier and body ground.

      Item Content
      Tool setting 1 V/DIV., 500 μs/DIV.
      Vehicle condition

      Engine switch on (IG)

      Blower switch on (LO)
      OK
      Waveform is as shown in the illustration.

      Tech Tips

      The waveform varies with the blower speed.


    NG

    REPLACE A/C AMPLIFIER Click here

    OK

    REPLACE BLOWER MOTOR Click here