HEATING / AIR CONDITIONING AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System) B1441/41 Air Mix Damper Control Servo Motor Circuit (Passenger Side)

DESCRIPTION

The air mix 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 the signals to move the air mix damper servo sub-assembly to any position. As a result, the amount of air passing through the heater core after passing the evaporator is adjusted, and 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	· Air mix damper servo sub-assembly · Air conditioning harness assembly · Air conditioning amplifier assembly	Memorized (30 sec. 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

5.781,2.396 6.552,2.594 0.771,0.198 10 false BUS 5.802,3.333 6.573,3.531 0.771,0.198 10 false BUS G 5.781,1.448 6.552,1.646 0.771,0.198 10 false B BUS 5.594,1.323 5.833,1.573 0.24,0.25 10 false 4 5.583,2.281 5.823,2.531 0.24,0.25 10 false 3 5.583,3.229 5.823,3.479 0.24,0.25 10 false 2 5.417,4.24 6.188,4.438 0.771,0.198 10 false z1 2.938,4.271 4.49,4.708 1.552,0.438 10 false Air Conditioning Harness Assembly 5.406,4.417 6.948,4.844 1.542,0.427 10 false Air Conditioning Amplifier Assembly 0.156,4.271 2.615,4.469 2.458,0.198 10 false Air Mix Damper Servo Sub-assembly

CAUTION / NOTICE / HINT

HINT:: Confirm that no mechanical problems are present because this DTC can be output when either a damper link or damper is mechanically locked.

PROCEDURE

1.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.

Read the Data List according to the display on the GTS.

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	· MAX COLD: 6 (pulse) · MAX HOT: 93 (pulse)	-
Air Mix Servo Actual Pulse(D)	Air mix damper servo sub-assembly actual pulse	Min.: 0 Max.: 255	· MAX COLD: 6 (pulse) · MAX HOT: 93 (pulse)	-

Body Electrical > Air Conditioner > Data List

Tester Display
Air Mix Servo Targ Pulse(D)
Air Mix Servo Actual Pulse(D)

50003 121 70,128

OK:: When the temperature adjustment switch is turned from MAX COLD to MAX HOT, the actual pulse changes following the target pulse.

Result:

Result	Proceed to
Target pulse changes but actual pulse does not change	A
Target pulse and actual pulse do not change	B
Actual pulse changes following the target pulse (When troubleshooting according to the DTC)	C
Actual pulse changes following the target pulse (When troubleshooting according to Problem Symptoms Table)	D

2.REPLACE AIR MIX DAMPER SERVO SUB-ASSEMBLY

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING AMPLIFIER>REMOVAL

4.RECONFIRM DTC OUTPUT

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System)>PROBLEM SYMPTOMS TABLE

2.REPLACE AIR MIX DAMPER SERVO SUB-ASSEMBLY

Replace the air mix damper servo sub-assembly.

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING UNIT>DISASSEMBLY

HINT:: 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 DTCs.

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System)>DTC CHECK / CLEAR

Body Electrical > Air Conditioner > Trouble Codes: 50001 121

Result:

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

3.REPLACE AIR CONDITIONING HARNESS ASSEMBLY

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

3.REPLACE AIR CONDITIONING HARNESS ASSEMBLY

Replace the air conditioning harness assembly.

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING UNIT>REMOVAL

HINT:: 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 DTCs.

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System)>DTC CHECK / CLEAR

Body Electrical > Air Conditioner > Trouble Codes: 50001 121

Result:

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

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING AMPLIFIER>REMOVAL

END (AIR CONDITIONING HARNESS ASSEMBLY WAS DEFECTIVE)

4.RECONFIRM DTC OUTPUT

Check for DTCs.

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System)>DTC CHECK / CLEAR

Body Electrical > Air Conditioner > Trouble Codes: 50001 121

Result:

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

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING AMPLIFIER>REMOVAL

USE SIMULATION METHOD TO CHECK

Click hereGeneral>INTRODUCTION>HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS>HOW TO PROCEED WITH TROUBLESHOOTING