AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System), Diagnostic DTC:B1441/41

DTC Code	DTC Name
B1441/41	Air Mix Damper Control Servo Motor Circuit (Passenger Side)

DESCRIPTION

for Dual Type
The air mix damper servo sub-assembly (for front passenger side) sends pulse signals to indicate the damper position to the air conditioning amplifier assembly. The air conditioning amplifier assembly activates the motor (normal or reverse) based on these signals to move the air mix damper servo sub-assembly (for front passenger side) to the appropriate position. This adjusts the amount of air passing through the heater core after passing the evaporator and controls the temperature of the output air. The air conditioning amplifier assembly communicates with the servo through a communication/driver IC and wiring assembly called the air conditioning harness assembly.

for Single Type
The air mix damper servo sub-assembly sends pulse signals to indicate the damper position to the air conditioning amplifier assembly. The air conditioning amplifier assembly activates the motor (normal or reverse) based on these signals to move the air mix damper servo sub-assembly to the appropriate position. This adjusts the amount of air passing through the heater core after passing the evaporator and controls the temperature of the output air. 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
B1441/41	Air Mix Damper Control Servo Motor Circuit (Passenger Side)	Air mix damper position sensor value does not change even if air conditioning amplifier assembly operates air mix damper servo sub-assembly (for front passenger side) (for dual type) or air mix damper servo sub-assembly (for single type)	Air mix damper servo sub-assembly (for front passenger side)1 Air mix damper servo sub-assembly2 Air conditioning harness assembly Air conditioning amplifier assembly	Memorized (30 sec. or more)*3

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

B1441/41

Air Mix Damper Control Servo Motor Circuit (Passenger Side)

Air mix damper position sensor value does not change even if air conditioning amplifier assembly operates air mix damper servo sub-assembly (for front passenger side) (for dual type) or air mix damper servo sub-assembly (for single type)

Air mix damper servo sub-assembly (for front passenger side)*1
Air mix damper servo sub-assembly*2
Air conditioning harness assembly
Air conditioning amplifier assembly

Memorized

(30 sec. or more)*3

*1: for Dual Type
*2: for Single Type
*3: 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.

PROCEDURE

CONFIRM MODEL

Result

Proceed to
for Dual Type
for Single Type

for Single Type

READ VALUE USING GTS Click here

for Dual Type

READ VALUE USING GTS

Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Operate the front passenger side temperature adjustment switch.
Enter the following menus: Body Electrical / Air Conditioner / Data List.

Check the value(s) by referring to the table below.

Body Electrical > Air Conditioner > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Air Mix Servo Targ Pulse(P)	Air mix damper servo sub-assembly (front passenger side) target pulse	Min.: 0 Max.: 255	for LHD: MAX. COLD: 6 (pulse) MAX. HOT: 93 (pulse) for RHD: MAX. COLD: 92 (pulse) MAX. HOT: 5 (pulse)	-

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Air Mix Servo Targ Pulse(P)

Air mix damper servo sub-assembly (front passenger side) target pulse

Min.: 0

Max.: 255

for LHD:

MAX. COLD: 6 (pulse)
MAX. HOT: 93 (pulse)

for RHD:

MAX. COLD: 92 (pulse)
MAX. HOT: 5 (pulse)

Body Electrical > Air Conditioner > Data List

Tester Display
Air Mix Servo Targ Pulse(P)

OK
The display is as specified in the normal condition column.

Result

Result	Proceed to
OK (When troubleshooting according to the DTC)	A
OK (When troubleshooting according to Problem Symptoms Table)	B
NG	C

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

REPLACE AIR MIX DAMPER SERVO SUB-ASSEMBLY (FOR FRONT PASSENGER SIDE)

Replace the air mix damper servo sub-assembly (for front passenger side).

Click here

Tech Tips

Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a new or known good one and check that the condition returns to normal.

Check for the DTC.

Body Electrical > Air Conditioner > Trouble Codes

Result

Result	Proceed to
DTC B1441/41 is output	A
DTC B1441/41 is not output	B

END (AIR MIX DAMPER SERVO SUB-ASSEMBLY (FOR FRONT PASSENGER SIDE) WAS DEFECTIVE)

REPLACE AIR CONDITIONING HARNESS ASSEMBLY

Replace the air conditioning harness assembly.

Click here

Tech Tips

Since the air conditioning harness assembly cannot be inspected while it is removed from the vehicle, replace the air conditioning harness assembly with a new or known good one and check that the condition returns to normal.

Check for the DTC.

Body Electrical > Air Conditioner > Trouble Codes

Result

Result	Proceed to
DTC B1441/41 is output	A
DTC B1441/41 is not output	B

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

END (AIR CONDITIONING HARNESS ASSEMBLY WAS DEFECTIVE)

READ VALUE USING GTS

Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Operate the temperature adjustment switch.
Enter the following menus: Body Electrical / Air Conditioner / Data List.

Check the value(s) by referring to the table below.

Body Electrical > Air Conditioner > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Air Mix Servo Targ Pulse(D)	Air mix damper servo sub-assembly target pulse	Min.: 0 Max.: 255	for LHD: MAX. COLD: 92 (pulse) MAX. HOT: 5 (pulse) for RHD: MAX. COLD: 6 (pulse) MAX. HOT: 93 (pulse)	-

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Air Mix Servo Targ Pulse(D)

Air mix damper servo sub-assembly target pulse

Min.: 0

Max.: 255

for LHD:

MAX. COLD: 92 (pulse)
MAX. HOT: 5 (pulse)

for RHD:

MAX. COLD: 6 (pulse)
MAX. HOT: 93 (pulse)

Body Electrical > Air Conditioner > Data List

Tester Display
Air Mix Servo Targ Pulse(D)

OK
The display is as specified in the normal condition column.

Result

Result	Proceed to
OK (When troubleshooting according to the DTC)	A
OK (When troubleshooting according to Problem Symptoms Table)	B
NG	C

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

REPLACE AIR MIX DAMPER SERVO SUB-ASSEMBLY

Replace the air mix damper servo sub-assembly.

Click here

Tech Tips

Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a new or known good one and check that the condition returns to normal.

Check for the DTC.

Body Electrical > Air Conditioner > Trouble Codes

Result

Result	Proceed to
DTC B1441/41 is output	A
DTC B1441/41 is not output	B

END (AIR MIX DAMPER SERVO SUB-ASSEMBLY WAS DEFECTIVE)

REPLACE AIR CONDITIONING HARNESS ASSEMBLY

Replace the air conditioning harness assembly.

Click here

Tech Tips

Since the air conditioning harness assembly cannot be inspected while it is removed from the vehicle, replace the air conditioning harness assembly with a new or known good one and check that the condition returns to normal.

Check for the DTC.

Body Electrical > Air Conditioner > Trouble Codes

Result

Result	Proceed to
DTC B1441/41 is output	A
DTC B1441/41 is not output	B

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

END (AIR CONDITIONING HARNESS ASSEMBLY WAS DEFECTIVE)