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)  B1447  Air Mix Damper Control Servo Motor Circuit (Rear)  


DESCRIPTION

The No. 1 rear cooling unit 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 rear cooling unit damper servo sub-assembly to the appropriate position. As a result, the amount of air passing through the heater core after passing through the evaporator is adjusted, and the temperature of the air blowing toward the rear side is controlled. The air conditioning amplifier assembly communicates with the servo through a communication/driver IC and wiring assembly called the No. 1 air conditioning harness assembly.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory
B1447 Air Mix Damper Control Servo Motor Circuit (Rear)
·

Diagnosis condition: During No. 1 rear cooling unit damper servo sub-assembly (mode) 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 rear cooling unit damper servo sub-assembly

·

No. 2 air conditioning harness assembly

·

Air conditioning amplifier assembly

·

Rear cooling unit assembly


Memorized

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


DTC Detection Condition Combination Table
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition During No. 1 rear cooling unit damper servo sub-assembly operation ○ ○
Malfunction The damper servo operation request signals are output but the air mix damper position sensor value does not change ○ -
The damper servo operation request signals are output but the air mix damper position sensor value is abnormal - ○
Detection Time Continuously for 30 seconds or more Continuously for 30 seconds or more
Trip Count 1 trip 1 trip

HINT:

If the conditions of either of these patterns are detected, a DTC will be stored.


WIRING DIAGRAM

E315725E49
5.208,1.146 5.979,1.344 0.771,0.198 10 false RBBU 5.219,0.698 5.99,0.896 0.771,0.198 10 false RBUS 5.219,1.531 5.99,1.729 0.771,0.198 10 false RBUG 4.99,1.146 5.26,1.344 0.271,0.198 10 false 2 4.99,0.698 5.26,0.896 0.271,0.198 10 false 7 5,1.531 5.271,1.729 0.271,0.198 10 false 3 3.427,2.073 4.823,2.5 1.396,0.427 10 false No. 2 Air Conditioning Harness Assembly 5.188,2.323 6.021,2.521 0.833,0.198 10 false N44 5.188,2.479 6.75,2.969 1.563,0.49 10 false Air Conditioning Amplifier Assembly 0.729,2.219 2.729,2.656 2,0.438 10 false No. 1 Rear Cooling Unit Damper Servo Sub-assembly 6.021,0.865 6.406,1.063 0.385,0.198 10 false IC 0.667,3.344 2.927,3.615 2.26,0.271 10 false : LIN Communication Line 1.167,1.25 2.146,1.469 0.979,0.219 10 false Rear Air Mix 6.521,1.125 6.906,1.323 0.385,0.198 10 false +B

CAUTION / NOTICE / HINT

HINT:
·

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

·

When installing a damper servo motor, make sure to install it correctly.

·

After replacing a damper servo motor, make 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.

Body Electrical > Air Conditioner > Trouble Codes
50001 121

Result:
Result Proceed to
DTC B1497 is not output A
DTC B1447 and B1497 are output B



A

2.CHECK NO. 1 REAR COOLING UNIT DAMPER SERVO SUB-ASSEMBLY (INSTALLATION CONDITION)

B

GO TO DTC B1497

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


2.CHECK NO. 1 REAR COOLING UNIT DAMPER SERVO SUB-ASSEMBLY (INSTALLATION CONDITION)
a.

Check that the No. 1 rear cooling unit damper servo sub-assembly is installed correctly.

OK:

The No. 1 rear cooling unit damper servo sub-assembly is installed correctly.



Result:
Proceed to
OK
NG



OK

3.CHECK NO. 1 REAR COOLING UNIT DAMPER SERVO SUB-ASSEMBLY (MOTOR, LINK, DAMPER)

NG

INSTALL NO. 1 REAR COOLING UNIT DAMPER SERVO SUB-ASSEMBLY

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


3.CHECK NO. 1 REAR COOLING UNIT 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
Rear Air Mix Servo Targ Pulse No. 1 rear cooling unit damper servo motor sub-assembly (rear air mix) pulse Min.: 128
Max.: 383 		Operates between 254 and 299 pulses
Body Electrical > Air Conditioner > Data List
Tester Display Measurement Item Range Normal Condition Diagnostic Note
Air Mix Servo Actual Pulse(R) No. 1 rear cooling unit damper servo sub-assembly (rear air mix) actual pulse Min.: 128
Max.: 383
·

MAX. COLD: 254 (pulse)

·

MAX. HOT: 299 (pulse)


-
Body Electrical > Air Conditioner > Active Test
Active Test Display
Rear Air Mix Servo Targ Pulse
Data List Display
Air Mix Servo Actual Pulse(R)
50004 121 36 158
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
Rear Air Mix Servo Targ Pulse No. 1 rear cooling unit damper servo motor sub-assembly (rear air mix) pulse Min.: 128
Max.: 383 		Operates between 254 and 299 pulses
Body Electrical > Air Conditioner > Data List
Tester Display Measurement Item Range Normal Condition Diagnostic Note
Air Mix Servo Targ Pulse(R) No. 1 rear cooling unit damper servo sub-assembly (rear air mix) target pulse Min.: 128
Max.: 383
·

MAX. COLD: 254 (pulse)

·

MAX. HOT: 299 (pulse)


-
Air Mix Servo Actual Pulse(R) No. 1 rear cooling unit damper servo sub-assembly (rear air mix) actual pulse Min.: 128
Max.: 383
·

MAX. COLD: 254 (pulse)

·

MAX. HOT: 299 (pulse)


-
Body Electrical > Air Conditioner > Active Test
Active Test Display
Rear Air Mix Servo Targ Pulse
Data List Display
Air Mix Servo Targ Pulse(R)
Air Mix Servo Actual Pulse(R)
50004 121 36 77,158
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 REAR COOLING UNIT DAMPER SERVO SUB-ASSEMBLY
6.REPLACE NO. 1 REAR COOLING UNIT DAMPER SERVO SUB-ASSEMBLY
HINT:

Click hereVehicle Interior>HEATING / AIR CONDITIONING>REAR AIR CONDITIONING 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
Rear Air Mix Servo Targ Pulse No. 1 rear cooling unit damper servo motor sub-assembly (rear air mix) pulse Min.: 128
Max.: 383 		Operates between 254 and 299 pulses
Body Electrical > Air Conditioner > Data List
Tester Display Measurement Item Range Normal Condition Diagnostic Note
Air Mix Servo Actual Pulse(R) No. 1 rear cooling unit damper servo sub-assembly (rear air mix) actual pulse Min.: 128
Max.: 383
·

MAX. COLD: 254 (pulse)

·

MAX. HOT: 299 (pulse)


-
Body Electrical > Air Conditioner > Active Test
Active Test Display
Rear Air Mix Servo Targ Pulse
Data List Display
Air Mix Servo Actual Pulse(R)
50004 121 36 158
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 NO. 2 AIR CONDITIONING HARNESS ASSEMBLY

Click hereVehicle Interior>HEATING / AIR CONDITIONING>REAR AIR CONDITIONING UNIT>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
A/O Servo Pulse(Rr D) No. 2 rear cooling unit damper servo motor sub-assembly (rear mode) pulse Min.: 128
Max.: 383 		Operates between 200 and 276 pulses
Body Electrical > Air Conditioner > Data List
Tester Display Measurement Item Range Normal Condition Diagnostic Note
Air Outlet Servo Actual Pls(R) No. 2 rear cooling unit damper servo sub-assembly (rear mode) actual pulse Min.: 128
Max.: 383
·

FACE: 276 (pulse)

·

B/L: 238 (pulse)

·

FOOT: 200 (pulse)


-
Body Electrical > Air Conditioner > Active Test
Active Test Display
A/O Servo Pulse(Rr D)
Data List Display
Air Outlet Servo Actual Pls(R)
50004 121 56 151
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 REAR COOLING UNIT DAMPER SERVO SUB-ASSEMBLY

NG

9.CHECK REAR COOLING UNIT ASSEMBLY (DAMPER)
9.CHECK REAR COOLING UNIT ASSEMBLY (DAMPER)
a.

Remove the No. 1 rear cooling unit damper servo sub-assembly.

Click hereVehicle Interior>HEATING / AIR CONDITIONING>REAR AIR CONDITIONING 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 REAR COOLING UNIT ASSEMBLY