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Home >> Toyota >> 2021 >> Camry TRD >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Air Conditioning System (Auto A/C) - Diagnostic Codes (2 Of 2) & Symptom Tests (Except Hybrid) >> AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System) >> Blower Motor Circuit [03/2017 - 10/2020] >> Procedure

Blower Motor Circuit [03/2017 - 10/2020]: Procedure

  1. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Air Conditioner / Active Test.
    5. Perform the Active Test according to the display on the Techstream.

      Body Electrical > Air Conditioner > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Blower Motor Blower motor with fan sub-assembly Min.: 0
      Max.: 31      		 -

      Body Electrical > Air Conditioner > Active Test 

      Tester Display
      Blower Motor

      Result

      Result Proceed to
      Blower motor with fan sub-assembly does not operate A
      Blower motor with fan sub-assembly operates but does not change speed B

    Result: 

    B 

    See step  6

    Result: 

    A 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (BLOWER MOTOR WITH FAN SUB-ASSEMBLY - BODY GROUND) 
    1. Disconnect the A19 blower motor with fan sub-assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A19-1 (GND) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (BLOWER MOTOR WITH FAN SUB-ASSEMBLY - BATTERY) 
    1. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A19-3 (+B) - Body ground Always 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (BLOWER MOTOR WITH FAN SUB-ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY) 
    1. Disconnect the K54 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
      A19-2 (SI) - K54-6 (BLW) Always Below 1 Ω
      A19-2 (SI) or K54-6 (BLW) - Other terminals and body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  5

  5. INSPECT BLOWER MOTOR WITH FAN SUB-ASSEMBLY 
    GTY760413Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to Air Conditioning Amplifier Assembly)
    1. Connect the A19 blower motor with fan sub-assembly connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      K54-6 (BLW) - Body ground Always 4.75 to 5.25 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE BLOWER MOTOR WITH FAN SUB-ASSEMBLY. Refer to  REMOVAL [03/2017 - ] 

    Result: 

    OK 

    See step  6

  6. INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY 
    GTY758340Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Component with harness connected
    (Air Conditioning Amplifier Assembly)
    1. Connect the K54 air conditioning amplifier assembly connector.
    2. Turn the ignition switch to ON.
    3. Set the blower speed to LO.
    4. Using a Techstream, check the waveform.
      Item Content
      Terminal No. K54-6 (BLW) - K54-4 (GND)
      Tool Setting 2 V/DIV., 1 ms./DIV.
      Condition
      • Ignition switch ON
      • Blower speed: LO

      OK

      Waveform is similar to that shown in the illustration.

      HINT: 

      The waveform varies with the blower speed.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE BLOWER MOTOR WITH FAN SUB-ASSEMBLY. Refer to  REMOVAL [03/2017 - ] 

    Result: 

    NG 

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL [03/2017 - 06/2017]  , or refer to  REMOVAL [06/2017 - ] 

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