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Home >> Toyota >> 2019 >> RAV4 XLE, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 62 (Heating / Air Conditioning System (HV) - Diagnostic Codes (2 Of 3)) >> AIR CONDITIONING SYSTEM (for HV Model) >> DTC B1446: Air Mix Damper Control Servo Motor Circuit (Driver Side) [02/2019 - 08/2020] >> Procedure

DTC B1446: Air Mix Damper Control Servo Motor Circuit (Driver Side) [02/2019 - 08/2020]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK FOR DTC 
    1. Check for DTCs.

      Refer to DTC CHECK / CLEAR [02/2019 - ]

      Body Electrical > Air Conditioner > Trouble Codes 

      Result

      Result Proceed to
      DTC B1446 is output A
      DTC B1441, B1442, B1443 (w/o Driver Seat Centralized Control), B1446 and B1488 (w/ Driver Seat Centralized Control) are output B

    Result: 

    B 

    REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY 

    Refer to DISASSEMBLY [02/2019 - 08/2020]

    Result: 

    A 

    See step  2

  2. CHECK FOR DTC 
    1. Check for DTCs.

      Refer to DTC CHECK / CLEAR [02/2019 - ]

      Body Electrical > Air Conditioner > Trouble Codes 

      Result

      Result Proceed to
      DTC B1446 is output A
      DTC B1446 and B1497 are output B

    Result: 

    B 

    GO TO DTC B1497 

    Refer to DTC B1497: Communication Malfunction (Bus Ic) [02/2019 - 08/2020] 

    Result: 

    A 

    See step  3

  3. CHECK NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY 
    1. Check that the No. 1 air conditioning radiator damper servo sub-assembly is installed correctly.

      OK

      No. 1 air conditioning radiator damper servo sub-assembly is installed correctly.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REINSTALL NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY 

    Refer to REASSEMBLY [02/2019 - 08/2020]

    Result: 

    OK 

    See step  4

  4. CHECK NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (MOTOR, LINK, DAMPER) 
    1. Check for a wire harness caught between the links of the motors and dampers.

      OK

      No wire harnesses are caught between the links of the motors and dampers.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REMOVE PINCHED WIRE HARNESS 

    Result: 

    OK 

    See step  5

  5. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Using the Techstream, perform the following Active Test and read the Data List value.

      Body Electrical > Air Conditioner > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Air Mix Servo Targ Pulse(D) No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix) pulse Min.: 128
      Max.: 383      		 Operates between 165 to 257 pulses

      Body Electrical > Air Conditioner > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Air Mix Servo Actual Pulse(D) No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix) actual pulse Min.: 128
      Max.: 383
      • MAX COLD: 257 (pulse)
      • MAX HOT: 165 (pulse)
      		 -

      Body Electrical > Air Conditioner > Active Test 

      Active Test Display
      Air Mix Servo Targ Pulse(D)
      Data List Display
      Air Mix Servo Actual Pulse(D)

      OK

      The value of the Data List changes in accordance with the operation of the Active Test.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  9

    Result: 

    OK 

    See step  6

  6. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Using the Techstream, perform the following Active Test and read the Data List value.

      Body Electrical > Air Conditioner > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Air Mix Servo Targ Pulse(D) No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix) pulse Min.: 128
      Max.: 383      		 Operates between 165 to 257 pulses

      Body Electrical > Air Conditioner > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Air Mix Servo Targ Pulse(D) No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix) target pulse Min.: 128
      Max.: 383
      • MAX COLD: 257 (pulse)
      • MAX HOT: 165 (pulse)
      		 -
      Air Mix Servo Actual Pulse(D) No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix) actual pulse Min.: 128
      Max.: 383
      • MAX COLD: 257 (pulse)
      • MAX HOT: 165 (pulse)
      		 -

      Body Electrical > Air Conditioner > Active Test 

      Active Test Display
      Air Mix Servo Targ Pulse(D)
      Data List Display
      Air Mix Servo Targ Pulse(D)
      Air Mix Servo Actual Pulse(D)

      OK

      The target pulse value of the Data List matches the actual pulse.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK 

    Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2018 - ]

    Result: 

    NG 

    See step  7

  7. REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY 

    HINT: 

    Refer to DISASSEMBLY [02/2019 - 08/2020]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  8

  8. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Using the Techstream, perform the following Active Test and read the Data List value.

      Body Electrical > Air Conditioner > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Air Mix Servo Targ Pulse(D) No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix) pulse Min.: 128
      Max.: 383      		 Operates between 165 to 257 pulses

      Body Electrical > Air Conditioner > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Air Mix Servo Actual Pulse(D) No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix) actual pulse Min.: 128
      Max.: 383
      • MAX COLD: 257 (pulse)
      • MAX HOT: 165 (pulse)
      		 -

      Body Electrical > Air Conditioner > Active Test 

      Active Test Display
      Air Mix Servo Targ Pulse(D)
      Data List Display
      Air Mix Servo Actual Pulse(D)

      OK

      The value of the Data List changes in accordance with the operation of the Active Test.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    END 

    Result: 

    NG 

    REPLACE AIR CONDITIONING HARNESS ASSEMBLY 

    Refer to DISASSEMBLY [02/2019 - 08/2020]

  9. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Using the Techstream, perform the following Active Test and read the Data List value.

      Body Electrical > Air Conditioner > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Air Outlet Servo Pulse (D) w/ Driver Seat Centralized Control 
      1. No. 3 air conditioning radiator damper servo sub-assembly (driver side mode) pulse

      w/o Driver Seat Centralized Control 
      1. No. 1 air conditioning radiator damper servo sub-assembly (front mode) pulse
      		 Min.: 128
      Max.: 383      		 w/ Driver Seat Centralized Control 
      1. Operates between 164 to 278 pulses

      w/o Driver Seat Centralized Control 
      1. Operates between 234 to 348 pulses

      Body Electrical > Air Conditioner > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Air Outlet Servo Actu Pulse(D) w/ Driver Seat Centralized Control 
      1. No. 3 air conditioning radiator damper servo sub-assembly (driver side mode) actual pulse

      w/o Driver Seat Centralized Control 
      1. No. 1 air conditioning radiator damper servo sub-assembly (front mode) actual pulse
      		 Min.: 128
      Max.: 383      		 w/ Driver Seat Centralized Control 
      • S-FLOW: 278 (pulse)
      • FACE: 256 (pulse)
      • B/L: 245 (pulse)
      • FOOT-A: 224 (pulse)
      • FOOT-R (F): 215 (pulse)
      • FOOT-D: 207 (pulse)
      • F/D-R: 192 (pulse)
      • D/F: 173 (pulse)
      • DEF: 164 (pulse)

      w/o Driver Seat Centralized Control 
      • S-FLOW: 234 (pulse)
      • FACE: 256 (pulse)
      • B/L: 267 (pulse)
      • FOOT-A: 288 (pulse)
      • FOOT-R (F): 297 (pulse)
      • FOOT-D: 305 (pulse)
      • F/D-R: 320 (pulse)
      • D/F: 339 (pulse)
      • DEF: 348 (pulse)
      		 -

      Body Electrical > Air Conditioner > Active Test 

      Active Test Display
      Air Outlet Servo Pulse (D)
      Data List Display
      Air Outlet Servo Actu Pulse(D)

      OK

      The value of the Data List changes in accordance with the operation of the Active Test.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    See step  7

    Result: 

    NG 

    See step  10

  10. CHECK AIR CONDITIONING RADIATOR ASSEMBLY (DAMPER) 
    1. Remove the No. 1 air conditioning radiator damper servo sub-assembly.

      Refer to DISASSEMBLY [02/2019 - 08/2020]

    2. Operate the dampers by hand.

      OK

      The dampers are easily operated by hand.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY 

    Refer to REMOVAL [11/2018 - ]

    Result: 

    NG 

    REPLACE AIR CONDITIONING RADIATOR ASSEMBLY 

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