Infiniti F50. Manual — part 149
TROUBLE DIAGNOSIS
ATC-121
C
D
E
F
G
H
I
K
L
M
A
B
ATC
DIAGNOSTIC PROCEDURE FOR MULTIPLEX COMMUNICATION CIRCUIT (REAR CONTROL
SWITCH)
●
Rear control switch A/C operation does not work.
1.
CHECK FOR AUTO AMP. OUTPUT
1.
Turn ignition switch ON.
2.
Confirm multiplex communication signal between auto amp. har-
ness connector M120 terminal 30 (BR/W), 31 (GY/L) and
ground using an oscilloscope.
OK or NG
OK
>> GO TO 2
NG
>> Replace auto amp.
2.
CHECK CIRCUIT CONTINUITY BETWEEN REAR CONTROL SWITCH AND AUTO AMP.
1.
Turn ignition switch OFF.
2.
Disconnect rear control switch and auto amp. connector.
3.
Check continuity between rear control switch harness connector
B502 terminals 3 (BR/W), 4 (GY/L) and auto amp. harness con-
nector M120 terminals 30 (BR/W), 31 (GY/L).
OK or NG
OK
>> GO TO 3.
NG
>> Repair harness or connector.
Terminals
Voltage
(+)
(-)
Auto amp.
connector
Terminal No.
(wire color)
M120
31 (GY/L)
Ground
30 (BR/W)
RJIA1740E
RJIA0212E
HAK0363D
3 – 30
: Continuity should exist.
4 – 31
: Continuity should exist.
RJIA1741E
ATC-122
TROUBLE DIAGNOSIS
3.
CHECK FOR AUTO AMP. INPUT
1.
Reconnect rear control switch and auto amp. connector.
2.
Turn ignition switch ON.
3.
Confirm multiplex communication signal between auto amp. har-
ness connector M119 terminal 15 (G) and ground using an oscil-
loscope.
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 4.
4.
CHECK CIRCUIT CONTINUITY BETWEEN REAR CONTROL SWITCH AND AUTO AMP.
1.
Turn ignition switch OFF.
2.
Disconnect rear control switch connector and auto amp. connec-
tor.
3.
Check continuity between rear control switch harness connector
B502 terminal 11 (G) and auto amp. harness connector M119
terminal 15 (G).
OK or NG
OK
>> Replace rear control switch.
NG
>> Repair harness or connector.
Terminals
Voltage
(+)
(-)
Auto amp.
connector
Terminal No.
(wire color)
M119
15 (G)
Ground
RJIA1742E
RJIA0213E
11–15
: Continuity should exist.
RJIA1743E
CONTROL UNIT
ATC-123
C
D
E
F
G
H
I
K
L
M
A
B
ATC
CONTROL UNIT
PFP:27500
Removal and Installation
EJS001Y6
REMOVAL
Refer to
IP-10, "Removal and Installation"
INSTALLATION
Installation is basically the reverse order of removal.
ATC-124
AMBIENT SENSOR
AMBIENT SENSOR
PFP:27722
Removal and Installation
EJS0009Q
REMOVAL
1.
Remove front grille. Refer to
2.
Disconnect ambient sensor connector, then remove it.
INSTALLATION
Installation is basically the reverse order of removal.
RJIA0243E
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