AIR CONDITIONING SYSTEM Rear Blower Motor Circuit

DESCRIPTION

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

WIRING DIAGRAM

A01CCWOE03

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
      Rear Blower Motor Rear blower motor Min.: 0, Max.: 31 -
      OK
      Rear blower motor operates and rear blower motor speed level changes.
      Result
      Result Proceed to
      NG (Rear blower motor does not operate) A
      NG (Rear blower motor operates but does not change speed) B
      OK C

    B

    INSPECT A/C AMPLIFIER Click here

    C

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

    A

  2. INSPECT FUSE (RR A/C)


    1. Remove the RR A/C fuse from the main body ECU.

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

      Standard Resistance
      Tester Item Condition Specified Condition
      RR A/C Always Below 1 Ω

    NG

    REPLACE FUSE (RR A/C)

    OK

  3. INSPECT REAR BLOWER MOTOR


    1. A01CBFHE01

      Disconnect the rear blower motor connector.

    2. Connect a battery positive (+) lead to terminal 2 and a negative (-) lead to terminal 1, then check that the rear blower motor operates smoothly.

      OK
      The rear blower motor operates smoothly.

    NG

    REPLACE REAR BLOWER MOTOR Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (REAR BLOWER CONTROLLER - BODY GROUND)


    1. A01CBXUE03

      Disconnect the rear blower controller connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      M18-6 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (REAR BLOWER CONTROLLER - BATTERY)


    1. A01CBXUE04

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      M18-1 (+B) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (REAR BLOWER CONTROLLER - REAR BLOWER MOTOR)


    1. A01CD95E01

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      M18-2 (VM) - M10-2 Always Below 1 Ω
      M18-2 (VM) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A01CDGBE01

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      M10-1 - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK HARNESS AND CONNECTOR (REAR BLOWER CONTROLLER - A/C AMPLIFIER)


    1. A01CBOZE35

      Disconnect the A/C amplifier connector.

    2. A01CBXUE05

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G34-22 (BLWH) - M18-3 (SI) Always Below 1 Ω
      G34-22 (BLWH) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. INSPECT REAR BLOWER CONTROLLER


    1. A01CBOZE35

      Reconnect the rear blower controller connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      G34-22 (BLWH) - Body ground Always 4.5 to 5.5 V

    NG

    REPLACE REAR BLOWER CONTROLLER Click here

    OK

  10. INSPECT A/C AMPLIFIER


    1. Reconnect the A/C amplifier connector.

    2. A01CC8WE01

      Remove the A/C amplifier with the connectors still connected.

    3. Measure the waveform between terminal G34-22 (BLWH) of the A/C amplifier and body ground.

      Item Content
      Tool Setting 1 V/DIV., 500 μsec./DIV.
      Condition

      Engine switch on (IG)

      Blower switch: LO
      OK
      Waveform is as shown in the illustration.

      Tech Tips

      The waveform varies with the blower level.


    NG

    REPLACE A/C AMPLIFIER Click here

    OK

    REPLACE REAR BLOWER CONTROLLER Click here