Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM100000001FPH7
Model Year Start: 2019 Model: RAV4 HV Prod Date Range: [11/2018 -           ]
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): B1449; Air Outlet Damper Control Servo Motor Circuit (Rear); 2019 - 2024 MY RAV4 HV [11/2018 -        ]

DTC

B1449

Air Outlet Damper Control Servo Motor Circuit (Rear)

DESCRIPTION

The No. 2 air conditioning radiator damper servo sub-assembly (rear mode) 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 air outlet damper to the appropriate position, which controls the rear air outlet switching. 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

B1449

Air Outlet Damper Control Servo Motor Circuit (Rear)
  • Diagnosis condition: During No. 2 air conditioning radiator damper servo sub-assembly (rear mode) 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. 2 air conditioning radiator damper servo sub-assembly (rear mode)
  • Air conditioning harness assembly
  • Air conditioning radiator assembly
  • Air conditioning amplifier assembly

Memorized

(30 sec. or more)*
  • *: The air conditioning amplifier assembly stores this DTC if the malfunction has occurred for the period of time indicated in the brackets.

DTC Detection Condition Combination Table

 

Vehicle Condition

Pattern 1

Pattern 2

Diagnosis Condition

No. 2 air conditioning radiator damper servo sub-assembly (rear mode) operating

○

○

Malfunction

Air outlet damper servo operation request signals are output but the rear passenger side air outlet damper position sensor value does not change

○

-

Air outlet damper servo operation request signals are output but the rear passenger side air outlet damper position sensor value is abnormal

-

○

Detection Time

Continuously for 30 seconds or more

Continuously for 30 seconds or more

Trip Count

1 trip

1 trip

HINT:

If the conditions of either of these patterns are detected, a DTC will be stored.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

HINT:

  • Confirm that no mechanical problems are present because this DTC can be stored when either a damper link or damper is mechanically locked.
  • When installing a servo motor, make sure to install it correctly.
  • When the servo motor is replaced, be sure to perform servo motor initialization.

    Click here 2019 MY RAV4 HV [11/2018 - 02/2019]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): INITIALIZATION 2019 - 2024 MY RAV4 HV [02/2019 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): INITIALIZATION

PROCEDURE

1.

CHECK FOR DTC

(a) Check for DTCs.

Click here 2019 MY RAV4 HV [11/2018 - 02/2019]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): DTC CHECK / CLEAR 2019 - 2024 MY RAV4 HV [02/2019 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): DTC CHECK / CLEAR

Body Electrical > Air Conditioner > Trouble Codes

Result

Proceed to

B1449 is output

A

B1449 and B1497 are output

B
B

GO TO DTC B1497 2019 MY RAV4 HV [11/2018 - 02/2019]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): B1497; Communication Malfunction (Bus Ic) 2019 - 2020 MY RAV4 HV [02/2019 - 08/2020]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): B1497; Communication Malfunction (Bus Ic) 2021 - 2024 MY RAV4 HV [08/2020 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): B1497; Communication Malfunction (Bus Ic)

A

2.

INSPECT NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (INSTALLATION CONDITION)

(a) 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.

NG

INSTALL NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY CORRECTLY 2019 MY RAV4 HV [11/2018 - 02/2019]; HEATING / AIR CONDITIONING: AIR CONDITIONING UNIT (for A25A-FXS): REASSEMBLY 2019 - 2020 MY RAV4 HV [02/2019 - 08/2020]; HEATING / AIR CONDITIONING: AIR CONDITIONING UNIT (for A25A-FXS): REASSEMBLY 2021 - 2024 MY RAV4 HV [08/2020 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING UNIT (for A25A-FXS): REASSEMBLY

OK

3.

INSPECT NO. 2 AIR CONDITIONING RADIATOR 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

4.

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

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.

NG

GO TO STEP 8

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

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.

OK

USE SIMULATION METHOD TO CHECK

NG

6.

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

HINT:

Click here 2019 MY RAV4 HV [11/2018 - 02/2019]; HEATING / AIR CONDITIONING: AIR CONDITIONING UNIT (for A25A-FXS): DISASSEMBLY 2019 - 2020 MY RAV4 HV [02/2019 - 08/2020]; HEATING / AIR CONDITIONING: AIR CONDITIONING UNIT (for A25A-FXS): DISASSEMBLY 2021 - 2024 MY RAV4 HV [08/2020 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING UNIT (for A25A-FXS): DISASSEMBLY

NEXT

7.

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

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.

OK

END
NG

REPLACE AIR CONDITIONING HARNESS ASSEMBLY 2019 MY RAV4 HV [11/2018 - 02/2019]; HEATING / AIR CONDITIONING: AIR CONDITIONING UNIT (for A25A-FXS): DISASSEMBLY 2019 - 2020 MY RAV4 HV [02/2019 - 08/2020]; HEATING / AIR CONDITIONING: AIR CONDITIONING UNIT (for A25A-FXS): DISASSEMBLY 2021 - 2024 MY RAV4 HV [08/2020 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING UNIT (for A25A-FXS): DISASSEMBLY

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 Outlet Servo Pulse (D)

No. 1 air conditioning radiator damper servo sub-assembly (driver side 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 (driver side 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.

OK

GO TO STEP 6

NG

9.

INSPECT AIR CONDITIONING RADIATOR ASSEMBLY (DAMPER)

(a) Remove the No. 2 air conditioning radiator damper servo sub-assembly.

Click here 2019 MY RAV4 HV [11/2018 - 02/2019]; HEATING / AIR CONDITIONING: AIR CONDITIONING UNIT (for A25A-FXS): DISASSEMBLY 2019 - 2020 MY RAV4 HV [02/2019 - 08/2020]; HEATING / AIR CONDITIONING: AIR CONDITIONING UNIT (for A25A-FXS): DISASSEMBLY 2021 - 2024 MY RAV4 HV [08/2020 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING UNIT (for A25A-FXS): DISASSEMBLY

(b) Operate the dampers by hand.

OK:

The dampers are easily operated by hand.

OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPLACE AIR CONDITIONING RADIATOR ASSEMBLY