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

DTC Code DTC Name
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

E269952E01

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 hereClick here

    C

    CHECK AIR CONDITIONING AMPLIFIER ASSEMBLYClick here

    B

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

    1. E146411C01

      *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

      Tester Connection

      Condition

      Specified Condition

      G54-1 (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. E146411C02

      *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

      Tester Connection

      Condition

      Specified Condition

      G54-3 (+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 blower with fan motor sub-assembly connector.

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

      Standard Resistance

      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

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK BLOWER WITH FAN MOTOR SUB-ASSEMBLY

    1. E269948C02

      *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

    E265341C04

    *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.

      Tip:

      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