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