Infiniti M45 (Y34). Manual - part 236

ELECTRONIC KEY SYSTEM

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Diagnostic Procedure 2

AIS0029O

1. 

CHECK POWER SUPPLY CIRCUIT FOR STEERING LOCK CONTROL UNIT

●

Turn ignition switch OFF.

●

Disconnect steering lock control unit connector.

●

Check voltage between steering lock control unit connector M69
terminal 1 (Y/G) and ground.

OK or NG

OK

>> GO TO 2.

NG

>> Check the following.

●

10A fuse [No. 6, located in the fuse block (J/B)]

●

Harness for open or short between fuse block and
steering lock control unit

2. 

CHECK GROUND CIRCUIT FOR STEERING LOCK CONTROL UNIT

Check voltage continuity steering lock control unit connector M69
terminal 4 (B) and ground.

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace harness.

3. 

CHECK ELECTRONIC KEY INSERT SIGNAL

1.

Connect steering lock control unit connector.

2.

Check voltage between steering lock control unit connector M69
terminal 2 (PU/W) and ground.

OK or NG

OK

>> GO TO 4.

NG

>> Check the following.

●

Check harness for open or short between key switch and steering lock control unit.

1 (Y/G) – Ground

: Battery voltage

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4 (B) – Ground

: Continuity should exist.

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Terminals

Condition

Voltage

2 (PU/W) 

−

 ground

Electronic key removed from 
ignition key cylinder

0V

Electronic key inserted in 
ignition key cylinder

Battery voltage

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ELECTRONIC KEY SYSTEM

4. 

CHECK STEERING LOCK CONTROL UNIT

Insert the electronic key into the ignition key cylinder, and immedi-
ately check voltage between steering control unit connector M69 ter-
minal 3 (L) and ground.

OK or NG

OK

>> Replace steering lock control unit.

NG

>>

●

Replace NATS IMMU.

●

Check harness for open or short between NATS
IMMU and steering lock control unit.

Diagnostic Procedure 3

AIS0029P

1. 

CHECK SECURITY INDICATOR POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect the security indicator lamp connector.

3.

Check voltage between security indicator lamp connector M73
terminal 2 (Y/G) and ground.

OK or NG

OK

>> GO TO 2.

NG

>> Check harness for open or short between fuse block

and security indicator lamp.

2. 

CHECK SECURITY INDICATOR GROUND CIRCUIT

1.

Disconnect the NATS IMMU connector.

2.

Check continuity between security indicator lamp connector
M73 terminal 1 (G) and NATS IMMU connector M32 terminal 15
(G).

3.

Check continuity between NATS IMMU connector M32 terminal
15 (G) and ground.

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace harness.

Terminals

Condition

Voltage

3 (L) 

−

 ground

Insert electronic key into 
ignition key cylinder.

 Pointer of tester 

should move.

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2 (Y/G) – Ground

: Battery voltage

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1 (G) – 15 (G)

: Continuity should exist.

15 (G) – Ground

: Continuity should not exist.

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ELECTRONIC KEY SYSTEM

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3. 

CHECK SECURITY INDICATOR GROUND SIGNAL

1.

Connect NATS IMMU connector.

2.

Check continuity between NATS IMMU connector M32 terminal
15 (G) and ground.

OK or NG

OK

>> Replace security indicator lamp.

NG

>> Replace NATS IMMU.

15 (G) – Ground

: Continuity should exist intermittently.

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IVIS (INFINITI VEHICLE IMMOBILIZER SYSTEM-NATS)

IVIS (INFINITI VEHICLE IMMOBILIZER SYSTEM-NATS)

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Component Parts and Harness Connector Location

AIS002AN

NOTE:
If customer reports a “No start” condition, request ALL ELECTRONIC KEY to be brought to the Dealer is case
of a NATS malfunction.

System Description

AIS002AO

IVIS (Infinity Vehicle Immobilizer System – NATS) has the following immobilizer functions:

●

Since only IVIS (NATS) electronic keys, whose ID nos. have been registered into the ECM and NATS
IMMU of IVIS (NATS), allow the engine to run, operation of a stolen vehicle without a IVIS (NATS) regis-
tered electronic key is pre-vented by IVIS (NATS).
That is to say, IVIS (NATS) will immobilize the engine if someone tries to start it without the registered
electronic key of IVIS (NATS).

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