Infiniti M45 (Y34). Manual — part 144
TROUBLE DIAGNOSIS
ATC-61
C
D
E
F
G
H
I
K
L
M
A
B
ATC
Potentio Temperature Control (PTC)
The PTC is built into the multifunction switch. It can be set at an
interval of 0.5
°
C (1.0
°
F) in the 18
°
C (60
°
F) to 32
°
C (90
°
F) tempera-
ture range by turning the temperature dial. The set temperature is
displayed.
DIAGNOSTIC PROCEDURE FOR A/C SYSTEM
SYMPTOM: A/C system does not come on.
1.
CHECK POWER SUPPLY CIRCUIT FOR AUTO AMP.
1.
Disconnect auto amp. connector.
2.
Check voltage between auto amp. harness connector M119 ter-
minal 7 (GY/L), M120 terminals 26 (Y/G), 27 (P) and ground.
OK or NG
OK
>> GO TO 2.
NG
>> Check 10A fuses [Nos. 2, 6 and 21 located in the fuse block (J/B) No. 1]. Refer to
BLOCK - JUNCTION BOX (J/B) NO.1"
.
●
If fuses are OK, check for open circuit in wiring harness. Repair or replace if necessary.
●
If fuses are NG, replace fuse and check wiring harness for short circuit. Repair or replace if nec-
essary.
RJIA1284E
RJIA0240E
Terminals
Ignition switch position
(+)
(-)
OFF
ACC
ON
Auto amp.
connector
Terminal No.
(Wire color)
Ground
voltage
M119
7 (GY/L)
Approx. 0V
Battery
voltage
Battery
voltage
M120
26 (Y/G)
Battery
voltage
Battery
voltage
Battery
voltage
M120
27 (P)
Approx. 0V
Approx. 0V
Battery
voltage
RJIA3025E
ATC-62
TROUBLE DIAGNOSIS
2.
CHECK GROUND CIRCUIT FOR AUTO AMP.
1.
Turn ignition switch OFF.
2.
Check continuity between auto amp. harness connector M120
terminal 25 (B) and ground.
OK or NG
OK
>> Replace auto amp.
NG
>> Repair or replace harness.
LAN System Circuit
AJS000C9
SYMPTOM: Mode door motor, intake door motor and/or air mix door motor does not operate normally.
DIAGNOSTIC PROCEDURE FOR LAN CIRCUIT
1.
CHECK POWER SUPPLY FOR AUTO AMP.
1.
Turn ignition switch ON.
2.
Check voltage between auto amp. harness connector M120 ter-
minal 21 (GY) and ground.
OK or NG
OK
>> GO TO 2.
NG
>> Replace auto amp.
25 – Ground
: Continuity should exist.
RJIA3026E
RJIA0272E
21 – Ground
: Approx. 12V
RJIA3027E
TROUBLE DIAGNOSIS
ATC-63
C
D
E
F
G
H
I
K
L
M
A
B
ATC
2.
CHECK SIGNAL FOR AUTO AMP.
Check voltage between auto amp. harness connector M119 terminal
5 (G/Y) and ground.
OK or NG
OK
>> GO TO 3.
NG
>> Replace auto amp.
3.
CHECK POWER SUPPLY FOR MOTOR
Check voltage between passenger side mode door motor harness
connector M106 terminal 1 (GY), passenger side air mix door motor
harness connector M107 terminal 1 (GY), intake door motor harness
connector M118 terminal 1 (GY), driver side mode door motor har-
ness connector M471 terminal 3 (GY), driver side air mix door motor
harness connector M472 terminal 3 (GY) and ground.
OK or NG
OK
>> GO TO 4.
NG
>> Replace harness or connector.
4.
CHECK SIGNAL FOR MOTOR
Check voltage between passenger side mode door motor harness
connector M106 terminal 3 (G/Y), passenger side air mix door motor
harness connector M107 terminal 3 (G/Y), intake door motor har-
ness connector M118 terminal 3 (G/Y), driver side mode door motor
harness connector M471 terminal 6 (G/Y), driver side air mix door
motor connector M472 terminal 6 (G/Y) and ground.
OK or NG
OK
>> GO TO 5.
NG
>> Replace harness or connector.
5.
CHECK MOTOR GROUND CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect door motor connector.
3.
Check continuity between passenger side mode door motor har-
ness connector M106 terminal 2 (B), passenger side air mix
door motor harness connector M107 terminal 2 (B), intake door
motor harness connector M118 terminal 2 (B), driver side mode
door motor harness connector M471 terminal 11 (B), driver side
air mix door motor harness connector M472 terminal 11 (B) and
ground.
OK or NG
OK
>> GO TO 6.
NG
>> Replace harness or connector.
5 – Ground
: Approx. 5V
RJIA2858E
1, 3 – Ground
: Approx. 12V
RJIA0275E
3, 6 – Ground
: Approx. 5V
RJIA0276E
2, 11 – Ground
: Continuity should exist.
RJIA0277E
ATC-64
TROUBLE DIAGNOSIS
6.
CHECK MOTOR OPERATION
1.
Turn ignition switch OFF.
2.
Disconnect each door motor connector.
3.
Reconnect each door motor connector.
4.
Turn ignition switch ON.
5.
Confirm each door motor operation.
OK or NG
OK
>> (Return to operate normally.)
●
Poor contacting the motor connector
NG
>> (Does not operate normally.)
●
GO TO 7.
7.
CHECK AIR MIX AND INTAKE DOOR MOTOR OPERATION
1.
Turn ignition switch OFF.
2.
Disconnect mode door motor (driver side, passenger side), air mix door motor (driver side, passenger
side) and intake door motor connector.
3.
Reconnect air mix door motor (driver side, passenger side) and intake door motor connectors.
4.
Turn ignition switch ON.
5.
Confirm air mix door motor (driver side, passenger side) and intake door motors operation.
OK or NG
OK
>> (Air mix and door motor operates normally.)
●
GO TO 10.
NG
>> (Intake door motor does not operate normally.)
●
GO TO 8.
8.
CHECK MODE AND INTAKE DOOR MOTOR OPERATION
1.
Turn ignition switch OFF.
2.
Disconnect air mix door motor connector (driver side, passenger side).
3.
Reconnect mode door motor connector (driver side, passenger side).
4.
Turn ignition switch ON.
5.
Confirm mode and intake door motor operation.
OK or NG
OK
>> (Mode and intake door motor operates normally.)
●
GO TO 11.
NG
>> (Mode and intake door motor does not operate normally.)
●
GO TO 9.
9.
CHECK MODE AND AIR MIX DOOR MOTOR OPERATION
1.
Turn ignition switch OFF.
2.
Disconnect intake door motor connector.
3.
Reconnect air mix door motor connector (driver side, passenger side).
4.
Turn ignition switch ON.
5.
Confirm mode and air mix door motor operation.
OK or NG
OK
>> (Mode and air mix door motor operates normally.)
●
Replace intake door motor.
NG
>> (Intake door motor does not operate normally.)
●
Replace auto amp.
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