AIR CONDITIONING SYSTEM, Diagnostic DTC:B1443

DTC Code	DTC Name
B1443	Air Outlet Damper Control Servo Motor Circuit

DESCRIPTION

for LHD:
The No. 1 air conditioning radiator 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 air outlet damper 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.

for RHD:
The No. 2 air conditioning radiator 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 air outlet damper 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 Detection Condition	Trouble Area	Memory
B1443	Air Outlet Damper Control Servo Motor Circuit	for LHD: Air outlet damper position sensor value does not change even if air conditioning amplifier assembly operates No. 1 air conditioning radiator damper servo sub-assembly for RHD: Air outlet damper position sensor value does not change even if air conditioning amplifier assembly operates No. 2 air conditioning radiator damper servo sub-assembly	No. 1 air conditioning radiator damper servo sub-assembly2 No. 2 air conditioning radiator damper servo sub-assembly3 Air conditioning harness assembly Air conditioning amplifier assembly Air conditioning radiator assembly	Memorized (30 sec. or more)*1

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

B1443

Air Outlet Damper Control Servo Motor Circuit

for LHD:

Air outlet damper position sensor value does not change even if air conditioning amplifier assembly operates No. 1 air conditioning radiator damper servo sub-assembly

for RHD:

Air outlet damper position sensor value does not change even if air conditioning amplifier assembly operates No. 2 air conditioning radiator damper servo sub-assembly

No. 1 air conditioning radiator damper servo sub-assembly*2
No. 2 air conditioning radiator damper servo sub-assembly*3
Air conditioning harness assembly
Air conditioning amplifier assembly
Air conditioning radiator assembly

Memorized

(30 sec. or more)*1

*1: The air conditioning amplifier assembly stores this DTC if the malfunction has occurred for the period of time indicated in the brackets.
*2: for LHD
*3: for RHD

WIRING DIAGRAM

for LHD
for RHD (for Dual Type)
for RHD (for Single Type)

CAUTION / NOTICE / HINT

Tech Tips

Confirm that no mechanical problem is present because this DTC can be output when either a damper link or damper is mechanically locked.
When installing the damper servo motor, make sure to install it correctly.

Click here

PROCEDURE

CONFIRM MODEL

Choose the model to be inspected.

Result

Result	Proceed to
for LHD	A
for RHD (for Dual Type)	B
for RHD (for Single Type)	C

CHECK FOR DTC Click here

CHECK FOR DTC

Check for DTCs.

Body Electrical > Air Conditioner > Trouble Codes

Result

Result	Proceed to
B1497 is not output	A
B1497 is output	B

GO TO DTC B1497 Click here

INSPECT NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (INSTALLATION CONDITION)

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

Tech Tips

Click here

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

Result

Proceed to
OK
NG

INSTALL NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY CORRECTLY

INSPECT NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (MOTOR, LINK, DAMPER)

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.

Result

Proceed to
OK
NG

REMOVE PINCHED WIRE HARNESS

INSPECT AIR CONDITIONING RADIATOR ASSEMBLY (DAMPER)

Remove the No. 1 air conditioning radiator damper servo sub-assembly.

Tech Tips

Click here

Operate the dampers by hand.

OK
The dampers are easily operated by hand.

Result

Proceed to
OK
NG

REPLACE AIR CONDITIONING RADIATOR ASSEMBLY Click here

PERFORM ACTIVE TEST USING GTS

Remove the No. 3 air conditioning radiator damper servo sub-assembly.

Tech Tips

Click here
Connect the No. 3 air conditioning radiator damper servo sub-assembly connector to the No. 1 air conditioning radiator damper servo sub-assembly.
Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.
Enter the following menus: Body Electrical / Air Conditioner / Active Test.

Perform the Active Test according to the display on the GTS.

Body Electrical > Air Conditioner > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
A/O Servo Pulse(Rr D)	No. 3 air conditioning radiator damper servo sub-assembly pulse*	Min.: 128 Max.: 383	Operates between 250 to 297 pulses

Tester Display

Measurement Item

Control Range

Diagnostic Note

A/O Servo Pulse(Rr D)

No. 3 air conditioning radiator damper servo sub-assembly pulse*

Min.: 128

Max.: 383

Operates between 250 to 297 pulses

*: Thus this Active Test is for the No. 3 air conditioning radiator damper servo sub-assembly, in this case it is used to check the operation of the No. 1 air conditioning radiator damper servo sub-assembly.

Body Electrical > Air Conditioner > Active Test

Tester Display
A/O Servo Pulse(Rr D)

OK
The No. 1 air conditioning radiator damper servo sub-assembly operates.

Result

Proceed to
OK
NG

REPLACE AIR CONDITIONING HARNESS ASSEMBLY Click here

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

CHECK FOR DTC

Check for DTCs.

Body Electrical > Air Conditioner > Trouble Codes

Result

Result	Proceed to
B1441, B1442, B1443 and B1446 are output	A
B1497 is output	B
B1443 is output	C

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

GO TO DTC B1497 Click here

GO TO STEP 9 Click here

CHECK FOR DTC

Check for DTCs.

Body Electrical > Air Conditioner > Trouble Codes

Result

Result	Proceed to
B1441, B1442 and B1443 are output	A
B1497 is output	B
B1443 is output	C

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

GO TO DTC B1497 Click here

INSPECT NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (MOTOR, LINK, DAMPER)

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.

Result

Proceed to
OK
NG

REMOVE PINCHED WIRE HARNESS

INSPECT AIR CONDITIONING RADIATOR ASSEMBLY (DAMPER)

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

Tech Tips

Click here

Operate the dampers by hand.

OK
The dampers are easily operated by hand.

Result

Proceed to
OK
NG

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

REPLACE AIR CONDITIONING RADIATOR ASSEMBLY Click here