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

DESCRIPTION

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

A017ER0E07

WIRING DIAGRAM

A017EGVE08

INSPECTION PROCEDURE

PROCEDURE


  1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (REAR BLOWER MOTOR)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch on (IG) and turn the intelligent tester main switch on.

    3. Select the item below in the Active Test, and then check that the rear blower motor operates.

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

    B

    CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BODY GROUND) Click here

    C

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    A

  2. INSPECT FUSE (RR CLR)


    1. Remove the RR CLR fuse from the main body ECU.

    2. Measure the resistance of the RR CLR fuse.

      Standard resistance
      Tester Connection Condition Specified Condition
      RR CLR fuse Always Below 1 Ω

    NG

    REPLACE FUSE

    OK

  3. INSPECT REAR BLOWER MOTOR


    1. A017BZIE02

      Disconnect the N9 motor connector.

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

      OK
      The rear blower motor operates smoothly.

    3. Measure the current of the connector.

      Standard current
      Tester Connection Condition Specified Condition
      N9-1 - N9-2 Rear blower motor operates Below 13.5 A

    NG

    REPLACE REAR BLOWER MOTOR Click here

    OK

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


    1. A017D9YE04

      Disconnect the N10 rear motor control connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      N10-6 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A017D9YE05

      Disconnect the N10 rear motor control connector.

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

      Standard voltage
      Tester Connection Condition Specified Condition
      N10-1 (+B) - Body ground Ignition switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BODY GROUND)


    1. A017G97E03

      Disconnect the D34 amplifier connector.

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

      Standard voltage
      Tester Connection Condition Specified Condition
      D34-22 (BLWH) - D34-20 (GND2)

      Ignition switch on (IG)

      Blower switch OFF

      		 4.5 to 5.5 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK AIR CONDITIONING AMPLIFIER


    1. A017ECKE04

      Remove the air conditioning amplifier with its connectors still connected.

    2. Check the waveform of the amplifier connector.

      OK
      Waveform is as shown in the illustration.

      Tech Tips

      The waveform varies with the blower level.

      Item Content
      Tester Connection BLWH (D34-22) - GND2 (D34-20)
      Tool Setting 1 V/DIV., 500 μsec./DIV.
      Condition

      Ignition switch on (IG)

      Blower switch LO

    NG

    REPLACE AIR CONDITIONING AMPLIFIER Click here

    OK

    REPLACE REAR BLOWER MOTOR Click here