Infiniti M45 (Y34). Manual — part 145
TROUBLE DIAGNOSIS
ATC-65
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D
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ATC
10.
CHECK MODE DOOR MOTOR OPERATION
1.
Turn ignition switch OFF.
2.
Reconnect mode door motor (driver side) connector.
3.
Turn ignition switch ON.
4.
Confirm the mode door motor (driver side) operation.
OK or NG
OK
>> [Mode door motor (driver side) operates normally.]
●
Replace mode door motor (passenger side).
NG
>> [Mode door motor (driver side) does not operate normally.]
●
Replace mode door motor (driver side).
11.
CHECK AIR MIX DOOR MOTOR OPERATION
1.
Turn ignition switch OFF.
2.
Reconnect air mix door motor (driver side) connector.
3.
Turn ignition switch ON.
4.
Confirm the air mix door motor (driver side) operation.
OK or NG
OK
>> [Air mix door motor (driver side) operates normally.]
●
Replace air mix door motor (passenger side).
NG
>> [Air mix door motor (driver side) does not operate normally.]
●
Replace air mix door motor (driver side).
ATC-66
TROUBLE DIAGNOSIS
Mode Door Motor Circuit
AJS001EY
SYMPTOM:
●
Air outlet does not change.
●
Mode door motor does not operate normally.
INSPECTION FLOW
*1
*2
*3
ATC-50, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No.1.
*4
ATC-50, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No. 5 to 7.
*5
ATC-101, "Ambient Sensor Circuit"
*6
ATC-103, "In-Vehicle Sensor Cir-
cuit"
*7
ATC-106, "Sunload Sensor Circuit"
*8
ATC-71, "Air Mix Door Motor PBR
Circuit"
.
*9
ATC-50, "FUNCTION CONFIRMA-
TION PROCEDURE"
, see No.14.
*10
*11
.
*12
*13
ATC-109, "Intake Sensor Circuit"
RJIA1286E
TROUBLE DIAGNOSIS
ATC-67
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ATC
SYSTEM DESCRIPTION
Component Parts
Mode door control system components are:
●
Auto amp.
●
Mode door motor (LCU)
●
A/C LAN system (PBR built-in mode door motor, air mix door motor and intake door motor)
●
In-vehicle sensor
●
Ambient sensor
●
Sunload sensor
●
Intake sensor
System Operation
The auto amp. receives data from each of the sensors. The auto amp. sends air mix door, mode door and
intake door opening angle data to the air mix door motor LCU, mode door motor LCU and intake door motor
LCU.
The air mix door motor, mode door motor and intake door motor read their respective signals according to the
address signal. Opening angle indication signals received from the auto amp. and each of the motor position
sensors are compared by the LCUs in each motor with the existing decision and opening angles. Subse-
quently, HOT/COLD or DEFROST/VENT or FRESH/RECIRCULATION operation is selected. The new selec-
tion data is returned to the auto amp.
Mode Door Control Specification
RJIA1287E
RHA384HA
ATC-68
TROUBLE DIAGNOSIS
COMPONENT DESCRIPTION
Mode Door Motor
The mode door motor is attached to the heater & cooling unit. It
rotates so that air is discharged from the outlet set by the auto amp.
Motor rotation is conveyed to a link which activates the mode door.
DIAGNOSTIC PROCEDURE FOR MODE DOOR MOTOR
SYMPTOM: Mode door motor does not operate normally.
Perform diagnostic procedure. Refer to
ATC-62, "DIAGNOSTIC PROCEDURE FOR LAN CIRCUIT"
RJIA0283E
RJIA0284E
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