RM35X0E _58 Vehicle Interior _079316 HEATING / AIR CONDITIONING _0386651 AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System) C

HEATING / AIR CONDITIONING  AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System)  B1442  Air Inlet Damper Control Servo Motor Circuit  


DESCRIPTION

The No. 1 blower 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 No. 1 blower damper servo sub-assembly to the appropriate position, which controls the air inlet mode (fresh, recirculation/fresh, and recirculation).

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
B1442 Air Inlet Damper Control Servo Motor Circuit
·

Diagnosis condition: During No. 1 blower damper servo sub-assembly 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 blower damper servo sub-assembly

·

Air conditioning harness assembly

·

Air conditioning amplifier assembly

·

Blower assembly


Memorized

DTC Detection Condition Combination Table
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition During No. 1 blower damper servo sub-assembly operation ○ ○
Malfunction Status The damper servo operation request signal is output but the position information of the servo does not change ○ -
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

E414332E01
5.042,0.708 5.813,0.906 0.771,0.198 10 false BUS 5.042,1.094 5.813,1.292 0.771,0.198 10 false BUSB 5.052,1.49 5.823,1.688 0.771,0.198 10 false BUSG 4.76,0.677 5.01,0.875 0.25,0.198 10 false 3 4.76,1.104 5.01,1.302 0.25,0.198 10 false 4 4.771,1.479 5.021,1.677 0.25,0.198 10 false 2 1.385,3.677 1.823,3.865 0.438,0.188 10 false Mode 0.771,4.896 2.688,5.563 1.917,0.667 10 false No. 1 Air Conditioning Radiator Damper Servo Sub-assembly 0.875,7.5 2.573,8 1.698,0.5 10 false No. 1 Blower Damper Servo Sub-assembly 3.156,7.438 4.698,7.875 1.542,0.438 10 false Air Conditioning Harness Assembly 4.729,8.083 5.5,8.281 0.771,0.198 10 false t2 4.719,8.25 6.99,8.5 2.271,0.25 10 false Air Conditioning Amplifier Assembly 0.885,8.563 3.26,8.823 2.375,0.26 10 false : LIN Communication Line 6.021,0.823 6.792,1.021 0.771,0.198 10 false IC 6.333,0.938 7.104,1.135 0.771,0.198 10 false +B 1.26,1.438 1.771,1.646 0.51,0.208 10 false Air Mix

CAUTION / NOTICE / HINT

NOTICE:
·

When DTC B1441, B1442 and B1443 are output at the same time, the No. 1 air conditioning radiator damper servo sub-assembly is malfunctioning.

·

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 hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System)>INITIALIZATION



PROCEDURE

1.CHECK FOR DTC
a.

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 B1442 is output A
DTC B1442 and B1497 are output B



A

2.CHECK NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY

B

GO TO DTC B1497

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System)>B1497


2.CHECK NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY
a.

Check that the No. 1 blower damper servo sub-assembly is installed correctly.

OK:

No. 1 blower damper servo sub-assembly is installed correctly.



Result:
Proceed to
OK
NG



OK

3.CHECK NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY (MOTOR, LINK, DAMPER)

NG

REINSTALL NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY

Click hereVehicle Interior>HEATING / AIR CONDITIONING>BLOWER UNIT>REASSEMBLY


3.CHECK NO. 1 BLOWER 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.



Result:
Proceed to
OK
NG



OK

4.PERFORM ACTIVE TEST USING GTS

NG

REMOVE PINCHED WIRE HARNESS

4.PERFORM ACTIVE TEST USING GTS
a.

Using the GTS, 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 Inlet Damper Targ Pulse No. 1 blower damper servo sub-assembly pulse Min.: 128
Max.: 383
for 1 Layer Type:

Operates between 235 to 258 pulses


for 2 Layer Type:

Operates between 220 to 256 pulses


Body Electrical > Air Conditioner > Data List
Tester Display Measurement Item Range Normal Condition Diagnostic Note
Air Inlet Damper Actual Pulse No. 1 blower damper servo sub-assembly actual pulse Min.: 128
Max.: 383
for 1 Layer Type:
·

Recirculation: 258 (pulse)

·

Fresh: 235 (pulse)


for 2 Layer Type:
·

Recirculation: 256 (pulse)

·

Fresh: 220 (pulse)


-
Body Electrical > Air Conditioner > Active Test
Active Test Display
Air Inlet Damper Targ Pulse
Data List Display
Air Inlet Damper Actual Pulse
50004 121 27 131
OK:

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



Result:
Proceed to
OK
NG



OK

5.PERFORM ACTIVE TEST USING GTS

NG

8.PERFORM ACTIVE TEST USING GTS
5.PERFORM ACTIVE TEST USING GTS
a.

Using the GTS, 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 Inlet Damper Targ Pulse No. 1 blower damper servo sub-assembly pulse Min.: 128
Max.: 383
for 1 Layer Type:

Operates between 235 to 258 pulses


for 2 Layer Type:

Operates between 220 to 256 pulses


Body Electrical > Air Conditioner > Data List
Tester Display Measurement Item Range Normal Condition Diagnostic Note
Air Inlet Damper Targ Pulse No. 1 blower damper servo sub-assembly target pulse Min.: 128
Max.: 383
for 1 Layer Type:
·

Recirculation: 258 (pulse)

·

Fresh: 235 (pulse)


for 2 Layer Type:
·

Recirculation: 256 (pulse)

·

Fresh: 220 (pulse)


-
Air Inlet Damper Actual Pulse No. 1 blower damper servo sub-assembly actual pulse Min.: 128
Max.: 383
for 1 Layer Type:
·

Recirculation: 258 (pulse)

·

Fresh: 235 (pulse)


for 2 Layer Type:
·

Recirculation: 256 (pulse)

·

Fresh: 220 (pulse)


-
Body Electrical > Air Conditioner > Active Test
Active Test Display
Air Inlet Damper Targ Pulse
Data List Display
Air Inlet Damper Targ Pulse
Air Inlet Damper Actual Pulse
50004 121 27 73,131
OK:

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



Result:
Proceed to
OK
NG



OK

USE SIMULATION METHOD TO CHECK

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


NG

6.REPLACE NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY
6.REPLACE NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY
HINT:

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


Result:
Proceed to
NEXT



NEXT

7.PERFORM ACTIVE TEST USING GTS
7.PERFORM ACTIVE TEST USING GTS
a.

Using the GTS, 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 Inlet Damper Targ Pulse No. 1 blower damper servo sub-assembly pulse Min.: 128
Max.: 383 		Operates between 220 to 256 pulses
Body Electrical > Air Conditioner > Data List
Tester Display Measurement Item Range Normal Condition Diagnostic Note
Air Inlet Damper Actual Pulse No. 1 blower damper servo sub-assembly actual pulse Min.: 128
Max.: 383
·

Recirculation: 256 (pulse)

·

Fresh: 220 (pulse)


-
Body Electrical > Air Conditioner > Active Test
Active Test Display
Air Inlet Damper Targ Pulse
Data List Display
Air Inlet Damper Actual Pulse
50004 121 27 131
OK:

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



Result:
Proceed to
OK
NG



OK

END

NG

REPLACE AIR CONDITIONING HARNESS ASSEMBLY

for LHD:Vehicle Interior>HEATING / AIR CONDITIONING>FRONT AIR CONDITIONING UNIT (for LHD)>DISASSEMBLY

for RHD:Vehicle Interior>HEATING / AIR CONDITIONING>FRONT AIR CONDITIONING UNIT (for RHD)>DISASSEMBLY



8.PERFORM ACTIVE TEST USING GTS
a.

Using the GTS, 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 (mode) pulse Min.: 128
Max.: 383 		Operates between 256 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 (mode) actual pulse Min.: 128
Max.: 383
·

FACE: 256 (pulse)

·

B/L: 267 (pulse)

·

FOOT-R (F): 305 (pulse)

·

FOOT-D: 305 (pulse)

·

F/D-R: 320 (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)
50004 121 26 130
OK:

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



Result:
Proceed to
OK
NG



OK

6.REPLACE NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY

NG

9.CHECK BLOWER ASSEMBLY (DAMPER)
9.CHECK BLOWER ASSEMBLY (DAMPER)
a.

Remove the No. 1 blower damper servo sub-assembly.

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


b.

Operate the dampers by hand.

OK:

The dampers are easily operated by hand.



Result:
Proceed to
OK
NG



OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

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


NG

REPLACE BLOWER ASSEMBLY