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Home >> Toyota >> 2022 >> RAV4 LE, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 54 (Heating / Air Conditioning System (HV) - Diagnostic Codes (2 Of 3)) >> AIR CONDITIONING SYSTEM (for HV Model) >> DTC B1449: Air Outlet Damper Control Servo Motor Circuit (Rear) [11/2018 - 02/2019] >> Procedure

DTC B1449: Air Outlet Damper Control Servo Motor Circuit (Rear) [11/2018 - 02/2019]: 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 [11/2018 - 02/2019]

      Body Electrical > Air Conditioner > Trouble Codes 

      Result

      Result Proceed to
      B1449 is output A
      B1449 and B1497 are output B

    Result: 

    B 

    GO TO DTC B1497 

    Refer to DTC B1497: Communication Malfunction (Bus Ic) [11/2018 - 02/2019] 

    Result: 

    A 

    See step  2

  2. INSPECT NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (INSTALLATION CONDITION) 
    1. Check that the No. 2 air conditioning radiator damper servo sub-assembly is installed correctly.

      OK

      The No. 2 air conditioning radiator damper servo sub-assembly is installed correctly.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    INSTALL NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY CORRECTLY 

    Refer to REASSEMBLY [11/2018 - 02/2019]

    Result: 

    OK 

    See step  3

  3. INSPECT NO. 2 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  4

  4. 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
      A/O Servo Pulse(Rr D) No. 2 air conditioning radiator damper servo sub-assembly pulse Min.: 128
      Max.: 383      		 Operates between 158 to 260 pulses

      Body Electrical > Air Conditioner > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Air Outlet Servo Actual Pls(R) No. 2 air conditioning radiator damper servo sub-assembly actual pulse Min.: 128
      Max.: 383
      • FACE: 260 (pulse)
      • F/D: 223 (pulse)
      • B/L: 212 (pulse)
      • FOOT: 182 (pulse)
      • D/F: 177 (pulse)
      • SHUT: 158 (pulse)
      		 -

      Body Electrical > Air Conditioner > Active Test 

      Active Test Display
      A/O Servo Pulse(Rr D)
      Data List Display
      Air Outlet Servo Actual Pls(R)

      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  8

    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
      A/O Servo Pulse(Rr D) No. 2 air conditioning radiator damper servo sub-assembly pulse Min.: 128
      Max.: 383      		 Operates between 158 to 260 pulses

      Body Electrical > Air Conditioner > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Air Outlet Servo Pulse (R) No. 2 air conditioning radiator damper servo sub-assembly target pulse Min.: 128
      Max.: 383
      • FACE: 260 (pulse)
      • F/D: 223 (pulse)
      • B/L: 212 (pulse)
      • FOOT: 182 (pulse)
      • D/F: 177 (pulse)
      • SHUT: 158 (pulse)
      		 -
      Air Outlet Servo Actual Pls(R) No. 2 air conditioning radiator damper servo sub-assembly actual pulse Min.: 128
      Max.: 383
      • FACE: 260 (pulse)
      • F/D: 223 (pulse)
      • B/L: 212 (pulse)
      • FOOT: 182 (pulse)
      • D/F: 177 (pulse)
      • SHUT: 158 (pulse)
      		 -

      Body Electrical > Air Conditioner > Active Test 

      Active Test Display
      A/O Servo Pulse(Rr D)
      Data List Display
      Air Outlet Servo Pulse (R)
      Air Outlet Servo Actual Pls(R)

      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  6

  6. REPLACE NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY 

    HINT: 

    Refer to DISASSEMBLY [11/2018 - 02/2019]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  7

  7. 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
      A/O Servo Pulse(Rr D) No. 2 air conditioning radiator damper servo sub-assembly pulse Min.: 128
      Max.: 383      		 Operates between 158 to 260 pulses

      Body Electrical > Air Conditioner > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Air Outlet Servo Actual Pls(R) No. 2 air conditioning radiator damper servo sub-assembly actual pulse Min.: 128
      Max.: 383
      • FACE: 260 (pulse)
      • F/D: 223 (pulse)
      • B/L: 212 (pulse)
      • FOOT: 182 (pulse)
      • D/F: 177 (pulse)
      • SHUT: 158 (pulse)
      		 -

      Body Electrical > Air Conditioner > Active Test 

      Active Test Display
      A/O Servo Pulse(Rr D)
      Data List Display
      Air Outlet Servo Actual Pls(R)

      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 [11/2018 - 02/2019]

  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 Outlet Servo Pulse (D) No. 1 air conditioning radiator damper servo sub-assembly (front mode) pulse Min.: 128
      Max.: 383      		 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) No. 1 air conditioning radiator damper servo sub-assembly (front mode) actual pulse Min.: 128
      Max.: 383
      • 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  6

    Result: 

    NG 

    See step  9

  9. INSPECT AIR CONDITIONING RADIATOR ASSEMBLY (DAMPER) 
    1. Remove the No. 2 air conditioning radiator damper servo sub-assembly.

      Refer to DISASSEMBLY [11/2018 - 02/2019]

    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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