Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM100000001FPS0
Model Year Start: 2019 Model: RAV4 Prod Date Range: [11/2018 - 08/2020]
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model): B1448; Passenger Side FACE Servo Motor Circuit; 2019 - 2020 MY RAV4 [11/2018 - 08/2020]

DTC

B1448

Passenger Side FACE Servo Motor Circuit

DESCRIPTION

The No. 3 air conditioning radiator damper servo sub-assembly (front passenger side 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 No. 3 air conditioning radiator damper servo sub-assembly (front passenger side mode) to the appropriate position, which controls the air outlet switching.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

B1448

Passenger Side FACE Servo Motor Circuit
  • Diagnosis condition: During No. 3 air conditioning radiator damper servo sub-assembly (front passenger side 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. 3 air conditioning radiator damper servo sub-assembly (front passenger side mode)
  • 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*1

No. 3 air conditioning radiator damper servo sub-assembly (front passenger side mode) operating

○

○

Diagnosis Condition*2

No. 4 air conditioning radiator damper servo sub-assembly operating

○

○

Malfunction

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

○

-

Air outlet damper servo operation request signals are output but the 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

NOTICE:

  • 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 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 B1448 is output

OK

DTC B1448 and B1497 are output

NG
NG

GO TO DTC B1497

OK

2.

CHECK NO. 3 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY

(a) Check that the No. 3 air conditioning radiator damper servo sub-assembly is installed correctly.

OK:

No. 3 air conditioning radiator damper servo sub-assembly is installed correctly.

NG

REINSTALL NO. 3 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY

OK

3.

CHECK NO. 3 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

Air Outlet Servo Pulse (P)

No. 3 air conditioning radiator damper servo sub-assembly (front passenger 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(P)

No. 3 air conditioning radiator damper servo sub-assembly (front passenger 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 (P)

Data List Display

Air Outlet Servo Actu Pulse(P)

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

Air Outlet Servo Pulse (P)

No. 3 air conditioning radiator damper servo sub-assembly (front passenger 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 Targ Pulse(P)

No. 3 air conditioning radiator damper servo sub-assembly (front passenger side mode) target 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)

-

Air Outlet Servo Actu Pulse(P)

No. 3 air conditioning radiator damper servo sub-assembly (front passenger 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 (P)

Data List Display

Air Outlet Servo Targ Pulse(P)

Air Outlet Servo Actu Pulse(P)

OK:

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

OK

USE SIMULATION METHOD TO CHECK

NG

6.

REPLACE NO. 3 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY

HINT:

Click here 2019 - 2020 MY RAV4 [11/2018 - 08/2020]; HEATING / AIR CONDITIONING: AIR CONDITIONING UNIT (for A25A-FKS): 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

Air Outlet Servo Pulse (P)

No. 3 air conditioning radiator damper servo sub-assembly (front passenger 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(P)

No. 3 air conditioning radiator damper servo sub-assembly (front passenger 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 (P)

Data List Display

Air Outlet Servo Actu Pulse(P)

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

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

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 6

NG

9.

CHECK AIR CONDITIONING RADIATOR ASSEMBLY (DAMPER)

(a) Remove the NO. 3 air conditioning radiator damper servo sub-assembly.

Click here 2019 - 2020 MY RAV4 [11/2018 - 08/2020]; HEATING / AIR CONDITIONING: AIR CONDITIONING UNIT (for A25A-FKS): 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