Infiniti M45 (Y34). Manual — part 235

ELECTRONIC KEY SYSTEM

BL-165

C

D

E

F

G

H

J

K

L

M

A

B

BL

Terminals and Reference Value for Steering Lock Control Unit

AIS0029I

Terminals and Reference Value for NATS IMMU

AIS0029J

TERMINAL

WIRE

COLOR

ITEM

CONDITION

VOLTAGE (V)

(Approx.)

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

→

0

3

L

NATS IMMU

Key inserted

Just after inserting electronic key to
key cylinder: Point of tester should
move

4

B

Ground

—

0

TERMINAL

WIRE

COLOR

ITEM

CONDITION

VOLTAGE (V)

(Approx.)

1

W

Battery power supply

—

Battery voltage

2

PU/W

Key switch

Key inserted (ON)

→

Key removed from

IGN key cylinder (OFF)

Battery voltage

→

0

3

W/B

Ignition switch

Ignition switch ON or START position

Battery voltage

5

R

NATS antenna amp.

key inserted (key switch OFF

→

ON)

0

→

5 (for 3 seconds)

6

Y/PU

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.

—

0

9

B/W

Ground

—

0

10

L

Steering lock control unit

Key inserted

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

→

0

BL-166

ELECTRONIC KEY SYSTEM

Work Flow

AIS0029K

PIIA2862E

ELECTRONIC KEY SYSTEM

BL-167

C

D

E

F

G

H

J

K

L

M

A

B

BL

Diagnostic System Diagram

AIS0029L

Symptom Chart

AIS0029M

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

BL-168

Security indicator turns OFF
with Electronic key inserted.

Diagnostic Procedure 2

NATS IMMU

A

BL-169

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

—

BL-170

Open circuit in the bat-
tery power supply line to
the security indicator

—

NATS IMMU

A

Harness system

C6

BL-168

ELECTRONIC KEY SYSTEM

Diagnostic Procedure 1

AIS0029N

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 between key switch terminals.

OK or NG

OK

>> Check the following.

●

10A fuse [No. 32, located in fuse block (J/B) No. 2]

●

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 key cylinder

Battery voltage

PIIA3124E

Continuity should exist.

PIIB0830E

Connector

Terminal

Condition of key switch

Continuity

M64

3 – 4

Key is inserted.

Yes

Key is removed.

No

PIIA3044E