HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model): B1449; Air Outlet Damper Control Servo Motor Circuit (Rear); 2019 - 2024 MY RAV4 [11/2018

Last Modified: 01-30-2024	6.11:8.1.0	Doc ID: RM100000001FPEC
Model Year Start: 2019	Model: RAV4	Prod Date Range: [11/2018 - ]
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model): B1449; Air Outlet Damper Control Servo Motor Circuit (Rear); 2019 - 2024 MY RAV4 [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

*: 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 air outlet damper position sensor value does not change	○	-
Malfunction	Air outlet damper servo operation request signals are output but the rear 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

PROCEDURE

1.	CHECK FOR DTC

(a) Check for DTCs.

Click here

Body Electrical > Air Conditioner > Trouble Codes

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

GO TO DTC B1497

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.

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

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.

REMOVE PINCHED WIRE HARNESS

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)
FOOT-R, D, O, F/D: 223 (pulse)
B/L: 212 (pulse)
FOOT-F: 182 (pulse)
D/F: 177 (pulse)
DEF: 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.

GO TO STEP 8

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.

USE SIMULATION METHOD TO CHECK

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

HINT:

Click here

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.

END

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.

GO TO STEP 6

9.	INSPECT AIR CONDITIONING RADIATOR ASSEMBLY (DAMPER)

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

Click here

(b) Operate the dampers by hand.

OK:

The dampers are easily operated by hand.

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

REPLACE AIR CONDITIONING RADIATOR ASSEMBLY