HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model): B1443; Air Outlet Damper Control Servo Motor Circuit; 2021 - 2025 MY RAV4 [08/2020

Last Modified: 02-14-2025	6.11:8.1.0	Doc ID: RM100000002Q8KW
Model Year Start: 2021	Model: RAV4	Prod Date Range: [08/2020 - ]
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model): B1443; Air Outlet Damper Control Servo Motor Circuit; 2021 - 2025 MY RAV4 [08/2020 - ]

DTC

B1443

Air Outlet Damper Control Servo Motor Circuit

DESCRIPTION

The No. 1 air conditioning radiator damper servo sub-assembly (front 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. 1 air conditioning radiator damper servo sub-assembly (front mode) to the appropriate position, which controls the 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 Diagnosis Condition	Trouble Area	Memory
B1443	Air Outlet Damper Control Servo Motor Circuit	Diagnosis condition: During No. 1 air conditioning radiator damper servo sub-assembly (front 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. 1 air conditioning radiator damper servo sub-assembly (front mode) Air conditioning harness assembly Air conditioning radiator assembly Air conditioning amplifier assembly	Memorized

DTC Diagnosis Condition Combination Table

		Vehicle Condition
		Pattern 1	Pattern 2
Diagnosis Condition	During No. 1 air conditioning radiator damper servo sub-assembly (front mode) operation	○	○
Malfunction Status	The damper servo operation request signal is output but the position information of the servo does not change	○	-
Malfunction Status	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

PROCEDURE

1.	CHECK FOR DTC

(a) Check for DTCs.

Click here

Body Electrical > Air Conditioner > Trouble Codes

Result	Proceed to
DTC B1443 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 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY

2.	CHECK FOR DTC

(a) Check for DTCs.

Click here

Body Electrical > Air Conditioner > Trouble Codes

Result	Proceed to
DTC B1443 is output	A
DTC B1443 and B1497 are output	B

GO TO DTC B1497

3.	CHECK NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY

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

OK:

No. 1 air conditioning radiator damper servo sub-assembly is installed correctly.

REINSTALL NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY

4.	CHECK NO. 1 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

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 (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.

GO TO STEP 9

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 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 Pulse (D)

No. 1 air conditioning radiator damper servo sub-assembly (front 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(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 Pulse (D)
Air Outlet Servo Actu Pulse(D)

OK:

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

USE SIMULATION METHOD TO CHECK

7.	REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY

HINT:

Click here

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 (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.

END

REPLACE AIR CONDITIONING HARNESS ASSEMBLY

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 Mix Servo Targ Pulse(D)

for Automatic Air Conditioning System:

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

for Manual Air Conditioning System:

No. 1 air conditioning radiator damper servo sub-assembly (air mix) pulse

Min.: 128

Max.: 383

Operates between 165 to 257 pulses

Body Electrical > Air Conditioner > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Air Mix Servo Actual Pulse(D)

for Automatic Air Conditioning System:

No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix) actual pulse

for Manual Air Conditioning System:

No. 1 air conditioning radiator damper servo sub-assembly (air mix) actual pulse

Min.: 128

Max.: 383

MAX COLD: 257 (pulse)
MAX HOT: 165 (pulse)

Body Electrical > Air Conditioner > Active Test

Active Test Display
Air Mix Servo Targ Pulse(D)

Data List Display
Air Mix Servo Actual Pulse(D)

OK:

The value of the Data List changes in accordance with the operation of the Active Test.

GO TO STEP 7

10.	CHECK AIR CONDITIONING RADIATOR ASSEMBLY (DAMPER)

(a) Remove the No. 1 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