Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM100000001FPE9
Model Year Start: 2019 Model: RAV4 Prod Date Range: [11/2018 -           ]
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model): B1442; Air Inlet Damper Control Servo Motor Circuit; 2019 - 2024 MY RAV4 [11/2018 -        ]

DTC

B1442

Air Inlet Damper Control Servo Motor Circuit

DESCRIPTION

The No. 1 blower damper servo sub-assembly sends pulse signals to inform the air conditioning amplifier assembly of the damper position. The air conditioning amplifier assembly activates the motor (normal or reverse) based on these signals to move the No. 1 blower damper servo sub-assembly to the appropriate position, which controls the air inlet mode (fresh, recirculation/fresh, and recirculation).

The air conditioning amplifier assembly communicates with the servo through a communication/driver IC and wiring assembly called the air conditioning harness assembly.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

B1442

Air Inlet Damper Control Servo Motor Circuit
  • Diagnosis condition: During No. 1 blower damper servo sub-assembly operation
  • Malfunction status: The damper servo operation request signal is output but the position information of the servo does not change or servo is malfunctioning
  • Detection time: Continuously for 30 seconds or more
  • No. 1 blower damper servo sub-assembly
  • Air conditioning harness assembly
  • Air conditioning radiator assembly
  • Air conditioning amplifier assembly

Memorized

DTC Detection Condition Combination Table

 

Vehicle Condition

Pattern 1

Pattern 2

Diagnosis Condition

During No. 1 blower damper servo sub-assembly operation

○

○

Malfunction Status

The damper servo operation request signal is output but the position information of the servo does not change

○

-

The damper servo operation request signal is output but the position information of the servo is malfunctioning

-

○

Detection Time

Continuously for 30 seconds or more

Continuously for 30 seconds or more

Trip Count

1 trip

1 trip

HINT:

If the conditions match either of these patterns, a DTC will be output.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • When DTC B1441, B1442, B1443 and B1446 are output at the same time, the No. 1 air conditioning radiator damper servo sub-assembly is malfunctioning (for Automatic Air Conditioning System).
  • When DTC B1441, B1442 and B1443 are output at the same time, the No. 1 air conditioning radiator damper servo sub-assembly is malfunctioning (for Manual Air Conditioning System).
  • Confirm that no mechanical problem is present because this diagnostic code can be output when either a damper link or the damper is mechanically locked.
  • When installing the servo motor, make sure to install it correctly.
  • When the servo motor is replaced, be sure to perform servo motor initialization.

    Click here 2019 - 2024 MY RAV4 [11/2018 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model): INITIALIZATION

PROCEDURE

1.

CHECK FOR DTC

(a) Check for DTCs.

Click here 2019 - 2024 MY RAV4 [11/2018 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model): DTC CHECK / CLEAR

Body Electrical > Air Conditioner > Trouble Codes

Result

Proceed to

DTC B1442 is output

A

DTC B1441, B1442, B1443 and B1446 are output (for Automatic Air Conditioning System)

B

DTC B1441, B1442 and B1443 are output (for Manual Air Conditioning System)
B

REPLACE NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY

A

2.

CHECK FOR DTC

(a) Check for DTCs.

Click here 2019 - 2024 MY RAV4 [11/2018 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model): DTC CHECK / CLEAR

Body Electrical > Air Conditioner > Trouble Codes

Result

Proceed to

DTC B1442 is output

A

DTC B1442 and B1497 are output

B
B

GO TO DTC B1497 2019 - 2020 MY RAV4 [11/2018 - 08/2020]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model): B1497; Communication Malfunction (Bus Ic) 2021 - 2024 MY RAV4 [08/2020 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model): B1497; Communication Malfunction (Bus Ic)

A

3.

CHECK NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY

(a) Check that the No. 1 blower damper servo sub-assembly is installed correctly.

OK:

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

NG

REINSTALL NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY

OK

4.

CHECK NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY (MOTOR, LINK, DAMPER)

(a) 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.

NG

REMOVE PINCHED WIRE HARNESS
OK

5.

PERFORM ACTIVE TEST USING TECHSTREAM

(a) 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.

NG

GO TO STEP 9

OK

6.

PERFORM ACTIVE TEST USING TECHSTREAM

(a) 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.

OK

USE SIMULATION METHOD TO CHECK

NG

7.

REPLACE NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY

HINT:

Click here 2019 - 2024 MY RAV4 RAV4 HV [11/2018 -        ]; HEATING / AIR CONDITIONING: BLOWER UNIT: DISASSEMBLY

NEXT

8.

PERFORM ACTIVE TEST USING TECHSTREAM

(a) 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.

OK

END
NG

REPLACE AIR CONDITIONING HARNESS ASSEMBLY 2019 - 2020 MY RAV4 [11/2018 - 08/2020]; HEATING / AIR CONDITIONING: AIR CONDITIONING UNIT (for A25A-FKS): DISASSEMBLY 2021 - 2024 MY RAV4 [08/2020 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING UNIT (for A25A-FKS): DISASSEMBLY

9.

PERFORM ACTIVE TEST USING TECHSTREAM

(a) 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 (driver side mode) pulse

Min.: 128

Max.: 383

w/ Driver Seat Centralized Control

  • Operates between 164 to 278 pulses

w/ Front Seat Centralized Control

  • 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 (driver side 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/ Front 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.

OK

GO TO STEP 7

NG

10.

CHECK BLOWER ASSEMBLY (DAMPER)

(a) Remove the No. 1 blower damper servo sub-assembly.

Click here 2019 - 2024 MY RAV4 RAV4 HV [11/2018 -        ]; HEATING / AIR CONDITIONING: BLOWER UNIT: DISASSEMBLY

(b) Operate the dampers by hand.

OK:

The dampers are easily operated by hand.

OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPLACE BLOWER ASSEMBLY