AIR CONDITIONING SYSTEM Rear Blower Motor Circuit

DESCRIPTION

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

WIRING DIAGRAM

A01MJLSE02

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS


    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.

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


      Body Electrical > Air Conditioner > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Assist Fan Cooler blower assembly

      Min.: 0

      Max.: 31

      		 -

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Assist Fan
      Result
      Result Proceed to
      OK A
      NG (Cooler blower assembly does not operate) B
      NG (Cooler blower assembly operates but does not change speed) C

    B

    INSPECT COOLER BLOWER ASSEMBLY (COOLER BLOWER MOTOR) Click here

    C

    GO TO STEP 9 Click here

    A

  2. READ VALUE USING GTS


    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 / Data List.

    5. Check the value(s) by referring to the table below.


      Body Electrical > Air Conditioner > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Rear FACE Shut Switch Console box resistor assembly (rear blower switch) ON or OFF

      ON: Console box resistor assembly (rear blower switch) ON

      OFF: Console box resistor assembly (rear blower switch) OFF

      		 -

      Body Electrical > Air Conditioner > Data List
      Tester Display
      Rear FACE Shut Switch
      OK
      The display is as specified in the normal condition column.
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

  3. INSPECT CONSOLE BOX RESISTOR ASSEMBLY (REAR BLOWER SWITCH)


    1. Remove the console box resistor assembly (rear blower switch).

      Click here

    2. A01MFM5C02
      *a

      Component without harness connected

      (Console Box Resistor Assembly (Rear Blower Switch))

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      G52-1 (RA/C) - G52-2 (E) Rear blower switch off 10 kΩ or higher
      Rear blower switch on Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE CONSOLE BOX RESISTOR ASSEMBLY (REAR BLOWER SWITCH) Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (CONSOLE BOX RESISTOR ASSEMBLY (REAR BLOWER SWITCH) - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. Disconnect the G52 console box resistor assembly (rear blower switch) connector.

    2. Disconnect the G42 air conditioning amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G52-1 (RA/C) - G42-18 (SWR1) Always Below 1 Ω
      G52-2 (E) - G42-19 (SWE) Always Below 1 Ω
      G52-1 (RA/C) or G42-18 (SWR1) - Body ground Always 10 kΩ or higher
      G52-2 (E) or G42-19 (SWE) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  5. INSPECT COOLER BLOWER ASSEMBLY (COOLER BLOWER MOTOR)


    1. Remove the cooler blower assembly (cooler blower motor).

      Click here

    2. A01MHGXC02
      *a

      Component without harness connecter

      Cooler Blower Assembly (Cooler Blower Motor)

      Check the cooler blower assembly (cooler blower motor) operation.

      OK
      Tester Connection Condition Specified Condition
      C-2 (+) - C-1 (-)

      Connect the auxiliary battery positive (+) - 2

      Connect the auxiliary battery negative (-) - 1

      		 Cooler blower motor operates smoothly
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR COOLER BLOWER ASSEMBLY Click here

    OK

  6. CHECK HARNESS AND CONNECTOR (COOLER BLOWER ASSEMBLY - POWER SOURCE CIRCUIT)


    1. A01MJ6DC02
      *a

      Front view of wire harness connector

      (to Cooler Blower Assembly)

      Disconnect the cooler blower assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G51-3 (GND) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G51-2 (+B) - Body ground Power switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. INSPECT COOLER BLOWER ASSEMBLY


    1. Remove the cooler blower assembly.

      Click here

    2. A01MGTTC02
      *1 D Fuse

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D Fuse Always Below 1 Ω

    3. Disconnect the B blower motor control connector.

    4. Disconnect the C cooler blower motor connector.

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

      A01MILSC02
      *a

      Component without harness connected

      (Blower Motor Control)

      		 *b

      Component without harness connected

      (Cooler Blower Motor)
      *c

      Component without harness connected

      (Cooler Blower Assembly)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      B-1 (+B) - G51-2 (+B) Always Below 1 Ω
      B-3 (SI) - G51-4 (SI) Always Below 1 Ω
      B-6 (GND) - G51-3 (GND) Always Below 1 Ω
      B-6 (GND) - C-1 (-) Always Below 1 Ω
      B-2 (VM) - C-2 (+) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR COOLER BLOWER ASSEMBLY Click here

    OK

  8. CHECK HARNESS AND CONNECTOR (COOLER BLOWER ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. Disconnect the G51 cooler blower assembly connector.

    2. Disconnect the G42 air conditioning amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G51-4 (SI) - G42-22 (BLWH) Always Below 1 Ω
      G51-4 (SI) or G42-22 (BLWH) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. Reconnect the G42 air conditioning amplifier assembly connector.

    2. Turn the power switch on (IG).

    3. Turn the rear blower switch on (LO).

    4. A01MJ6ZC02
      *a

      Component with harness connected

      (Air Conditioning Amplifier Assembly)

      Measure the waveform between terminal G42-22 (BLWH) 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
      Tool setting 2 V/DIV., 500 μs/DIV.
      Vehicle condition

      • Power switch on (IG)

      • Rear blower switch: LO
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE BLOWER MOTOR CONTROL Click here

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here