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Home >> Toyota >> 2020 >> RAV4 XLE, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 62 (Heating / Air Conditioning System (HV) - Diagnostic Codes (1 Of 3)) >> AIR CONDITIONING SYSTEM (for HV Model) >> DTC B1442: Air Inlet Damper Control Servo Motor Circuit [11/2018 - 02/2019] >> Procedure

DTC B1442: Air Inlet Damper Control Servo Motor Circuit [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
      DTC B1442 is output A
      DTC B1441, B1442, B1443, B1446 are output B

    Result: 

    B 

    REPLACE NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY 

    Refer to DISASSEMBLY [11/2018 - ]

    Result: 

    A 

    See step  2

  2. 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
      DTC B1442 is output A
      DTC B1442 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  3

  3. CHECK NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY 
    1. Check that the No. 1 blower damper servo sub-assembly is installed correctly.

      OK

      No. 1 blower damper servo sub-assembly is installed correctly.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REINSTALL NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY 

    Refer to REASSEMBLY [11/2018 - ]

    Result: 

    OK 

    See step  4

  4. CHECK NO. 1 BLOWER 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 Inlet Damper Targ Pulse No. 1 blower damper servo sub-assembly pulse Min.: 128
      Max.: 383      		 Operates between 220 to 256 pulses

      Body Electrical > Air Conditioner > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Air Inlet Damper Actual Pulse No. 1 blower damper servo sub-assembly actual pulse Min.: 128
      Max.: 383
      • Recirculation: 256 (pulse)
      • Fresh: 220 (pulse)
      • Double layer: 233 (pulse)
      		 -

      Body Electrical > Air Conditioner > Active Test 

      Active Test Display
      Air Inlet Damper Targ Pulse
      Data List Display
      Air Inlet Damper Actual Pulse

      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 Inlet Damper Targ Pulse No. 1 blower damper servo sub-assembly pulse Min.: 128
      Max.: 383      		 Operates between 220 to 256 pulses

      Body Electrical > Air Conditioner > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Air Inlet Damper Targ Pulse No. 1 blower damper servo sub-assembly target pulse Min.: 128
      Max.: 383
      • Recirculation: 256 (pulse)
      • Fresh: 220 (pulse)
      • Double layer: 233 (pulse)
      		 -
      Air Inlet Damper Actual Pulse No. 1 blower damper servo sub-assembly actual pulse Min.: 128
      Max.: 383
      • Recirculation: 256 (pulse)
      • Fresh: 220 (pulse)
      • Double layer: 233 (pulse)
      		 -

      Body Electrical > Air Conditioner > Active Test 

      Active Test Display
      Air Inlet Damper Targ Pulse
      Data List Display
      Air Inlet Damper Targ Pulse
      Air Inlet Damper Actual Pulse

      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 BLOWER DAMPER SERVO SUB-ASSEMBLY 

    HINT: 

    Refer to DISASSEMBLY [11/2018 - ]

    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 Inlet Damper Targ Pulse No. 1 blower damper servo sub-assembly pulse Min.: 128
      Max.: 383      		 Operates between 220 to 256 pulses

      Body Electrical > Air Conditioner > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Air Inlet Damper Actual Pulse No. 1 blower damper servo sub-assembly actual pulse Min.: 128
      Max.: 383
      • Recirculation: 256 (pulse)
      • Fresh: 220 (pulse)
      • Double layer: 233 (pulse)
      		 -

      Body Electrical > Air Conditioner > Active Test 

      Active Test Display
      Air Inlet Damper Targ Pulse
      Data List Display
      Air Inlet Damper Actual Pulse

      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]

  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) 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  7

    Result: 

    NG 

    See step  10

  10. CHECK BLOWER ASSEMBLY (DAMPER) 
    1. Remove the No. 1 blower damper servo sub-assembly.

      Refer to DISASSEMBLY [11/2018 - ]

    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 BLOWER ASSEMBLY 

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