AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System with Side-mounted Air Conditioner Pressure Sensor), Diagnostic DTC:B1443

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

DESCRIPTION

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.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory
B1443	Air Outlet Damper Control Servo Motor Circuit	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	No. 1 air conditioning radiator damper servo sub-assembly Air conditioning harness assembly Air conditioning amplifier assembly Air conditioning radiator assembly	Memorized (30 seconds or more)*

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

B1443

Air Outlet Damper Control Servo Motor Circuit

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

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

Memorized

(30 seconds or more)*

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

WIRING DIAGRAM

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

CHECK FOR DTC

Check for DTCs.

Click here

Body Electrical > Air Conditioner > Trouble Codes

Result

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

GO TO DTC B1497 Click here

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

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.

Click here

Operate the dampers by hand.

OK
The dampers are easily operated by hand.

Result

Proceed to
OK
NG

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

REPLACE AIR CONDITIONING RADIATOR ASSEMBLY Click here