AIR CONDITIONING SYSTEM Rear Blower Motor Circuit

DESCRIPTION

The rear blower motor with fan sub-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

B005PQRE02

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 engine 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
      Rear Blower Motor Rear blower motor with fan sub-assembly

      Min.: 0

      Max.: 31

      		 -

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Rear Blower Motor
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

  2. CHECK HARNESS AND CONNECTOR (BLOWER MOTOR CONTROL - POWER SOURCE AND BODY GROUND)


    1. Disconnect the R51 blower motor control connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      R51-1 (+B) - Body ground Always 11 to 14 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      R51-6 (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 MOTOR CONTROL - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. Disconnect the J48 air conditioning amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      J48-12 (BLWH) - R51-3 (SI) Always Below 1 Ω
      J48-12 (BLWH) or R51-3 (SI) - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      R50-2 (+) - R51-2 (VM) Always Below 1 Ω
      R50-1 (-) - Body ground Always Below 1 Ω
      R50-2 (+) or R51-2 (VM) - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY

    B005LHGC03
    *a

    Component with harness connected

    (Blower Motor Control)

    1. Connect the J48 air conditioning amplifier assembly connector.

    2. Measure the waveform.

      OK
      Waveform is similar to that shown in the illustration.
      Item Content
      Terminal No. R51-3 (SI) - Body ground
      Tool Setting 2 V/DIV., 500 μs./DIV.
      Vehicle Condition

      • Engine switch on (IG)

      • Blower switch: LO

      Tech Tips

      The waveform varies with the blower level.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    OK

  6. INSPECT REAR BLOWER MOTOR WITH FAN SUB-ASSEMBLY


    1. Remove the rear blower motor with fan sub-assembly connector.

      Click here

    2. Inspect the rear blower motor with fan sub-assembly connector.

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE BLOWER MOTOR CONTROL Click here

    NG

    REPLACE REAR BLOWER MOTOR WITH FAN SUB-ASSEMBLY Click here