Infiniti F50. Manual — part 236
ELECTRONIC KEY SYSTEM
BL-191
C
D
E
F
G
H
J
K
L
M
A
B
BL
Terminals and Reference Value for Steering Lock Control Unit
EIS003QI
Terminals and Reference Value for NATS IMMU
EIS003QJ
TERMINAL
WIRE
COLOR
ITEM
CONDITION
VOLTAGE
1
Y/G
Battery power supply
—
Battery voltage
2
PU/W
Key switch
Key inserted (ON)
→
Key removed from
IGN key cylinder (OFF)
Battery voltage
→
0V
3
L
NATS IMMU
Key inserted (key switch OFF
→
ON)
Just after inserting electronic key to
key cylinder: Point of tester should
move
4
B
Ground
—
0V
TERMINAL
WIRE
COLOR
ITEM
CONDITION
VOLTAGE
1
W
Battery power supply
—
Battery voltage
2
PU/W
Key switch
Key inserted (ON)
→
Key removed from
IGN key cylinder (OFF)
Battery voltage
→
0V
3
W/B
Ignition switch
Ignition switch ON or START position
Battery voltage
5
R
NATS antenna amp.
key inserted (key switch OFF
→
ON)
0V
→
Approx. 5V (for 3 seconds)
6
Y
NATS antenna amp.
Key inserted (key switch OFF
→
ON)
Just after inserting electronic key to
key cylinder: Point of tester should
move
7
Y/G
NATS antenna amp.
Key inserted (key switch OFF
→
ON)
Just after inserting electronic key to
key cylinder: Point of tester should
move
8
B/R
NATS antenna amp.
—
0V
9
B/W
Ground
—
0V
10
L
Steering lock control unit
Key inserted (key switch OFF
→
ON)
Just after inserting electronic key to
key cylinder: Point of tester should
move
11
G/W
ECM
—
—
15
G
Security indicator lamp
Goes OFF
→
illuminates (every 2.4 sec-
onds)
Battery voltage
→
0V
BL-192
ELECTRONIC KEY SYSTEM
Work Flow
EIS000O7
PIIA2862E
ELECTRONIC KEY SYSTEM
BL-193
C
D
E
F
G
H
J
K
L
M
A
B
BL
Diagnostic System Diagram
EIS000O8
Symptom Chart
EIS0012T
SYMPTOM 1: ELECTRONIC KEY DOES NOT TURN
*: If the ignition key cylinder cannot be turned by the emergency key, the ignition key cylinder is malfunctioning.
SYMPTOM 2: SECURITY INDICATOR DOES NOT FLASH
PIIA0378E
Symptom
Diagnostic Procedure
Possible malfunctioning
part or status
Reference part in the
trouble diagnostic
system diagram
Reference
page
Security indicator remains
flashing with Electronic key
inserted.
Diagnostic Procedure 1
Key switch
C5
Security indicator turns OFF
with Electronic key inserted.
Diagnostic Procedure 2
NATS IMMU
A
Steering lock control unit
F
Harness system
C7
Ignition key cylinder*
—
—
Checking with the emergency
key
Symptom
Diagnostic Procedure
Possible malfunctioning
part or status
Reference part in the
trouble diagnostic
system diagram
Reference
page
Security indicator does not turn
ON.
Diagnostic Procedure 3
Security indicator
—
Open circuit in the bat-
tery power supply line to
the security indicator
—
NATS IMMU
A
Harness system
C6
BL-194
ELECTRONIC KEY SYSTEM
Diagnostic Procedure 1
EIS0012U
1.
CHECK ELECTRONIC KEY INSERT SIGNAL
Check voltage between NATS IMMU connector M32 terminal 2 (PU/
W) and ground.
OK or NG
OK
>> Replace NATS IMMU.
NG
>> GO TO 2.
2.
CHECK KEY SWITCH CIRCUIT
1.
Remove the key from the ignition key cylinder.
2.
Disconnect NATS IMMU and key switch and key lock solenoid (key switch) connector.
3.
Check continuity between NATS IMMU connector M32 terminal 2 (PU/W) and key switch and key lock
solenoid (key switch) connector M64 terminal 4 (PU/W).
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace harness.
3.
CHECK KEY SWITCH
Check continuity key switch terminals.
OK or NG
OK
>> Check the following.
●
10A fuse [No. 8, located in fuse block (J/B) No.1]
●
Harness for open or short between key switch and
fuse
NG
>> Replace key switch.
Terminals
Condition
Voltage
2 (PU/W)
−
ground
Electronic key removed from
ignition key cylinder
0V
Electronic key inserted in
ignition cylinder
Battery voltage
PIIA3124E
Continuity should exist.
PIIA3138E
Terminal
Condition of key switch
Continuity
3 – 4
Key is inserted.
Yes
Key is removed.
No
PIIA3044E
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