Infiniti M35/M45 Y50. Manual - part 974

PDU (POWER DISTRIBUTION UNIT)

PG-41

C

D

E

F

G

H

I

J

L

M

A

B

PG

Check Push-Button Ignition Switch (Indicator Circuit) System

NKS004EN

1. 

CHECK PUSH-BUTTON IGNITION SWITCH INDICATOR SYSTEM

1.

Turn ignition switch OFF.

2.

Check voltage between Intelligent Key unit connector and
ground.

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace push-button ignition switch.

2. 

PUSH-BUTTON IGNITION SWITCH INDICATOR POWER SUPPLY SIGNAL

1.

Turn ignition switch OFF.

2.

Disconnect push-button ignition switch.

3.

Check voltage between push-button ignition switch connector
and ground.

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace push-button ignition switch.

Intelligent 

Key unit 

connector

Terminal

Push-button ignition 

switch condition

Voltage (V)

(Approx)

(+)

(-)

M32

8

Ground part of 
push-button 
ignition switch

LOCK position

0

Except LOCK position

1.2

9

ACC position

0

Except ACC position

1.2

10

ON position

0

Except ON position

1.2

PIIB6121E

Push-button ignition 

switch connector

Terminal

Voltage (V)

(Approx)

(+)

(-)

M27

8

Ground

Battery voltage

PIIB6122E

PG-42

PDU (POWER DISTRIBUTION UNIT)

3. 

PUSH-BUTTON IGNITION SWITCH INDICATOR GROUND CIRCUIT

1.

Disconnect Intelligent Key unit connector.

2.

Check continuity between Intelligent Key unit connector and
push-button ignition switch connector.

3.

Check continuity between push-button ignition switch connector.

OK or NG

OK

>> Check harness condition.

NG

>> Repair or replace harness.

PDU Communication Circuit System 1

NKS004EO

1. 

CHECK PDU COMMUNICATION CIRCUIT 1

1.

Turn ignition switch OFF.

2.

Check voltage between Intelligent Key unit connector and
ground.

OK or NG

OK

>> Check harness condition.

NG

>> GO TO 2.

A

B

Continuity 

Intelligent Key 
unit connector

Terminal

Push-button 

ignition switch 

connector

Terminal

M32

8

M27

5

Yes

9

6

10

7

Push-button  ignition 

switch connector

Terminal

Continuity

M27

5

Ground

No

6

7

PIIB6123E

Intelligent Key 
unit connector

Terminal Condition

Voltage (V)

(Approx) 

M33

42

Ground

Driver side door is opened

(PDU wake up mode)

0

Push-button ignition switch is in 

lock state, 30 seconds  after all 

doors are closed (PDU sleep 

mode)

Battery 
voltage

45

Ground

Push-button ignition switch is in 

LOCK position

Battery 
voltage

Push-button ignition switch is in 

ACC position

0

Push-button ignition switch is in 

ON position

0

PIIB6124E

PDU (POWER DISTRIBUTION UNIT)

PG-43

C

D

E

F

G

H

I

J

L

M

A

B

PG

2. 

CHECK PDU SIGNAL CIRCUIT

1.

Disconnect Intelligent Key unit, PDU connector.

2.

Check continuity between Intelligent Key unit connector and
PDU harness side connector.

3.

Check continuity between PDU connector and ground.

OK or NG

OK

>> Replace Intelligent Key.

NG

>> Check harness condition between Intelligent Key unit and PDU.

PDU Communication Circuit System 2

NKS004EP

1. 

CHECK PDU COMMUNICATION CIRCUIT 2

1.

Turn ignition switch OFF.

2.

Check voltage between Intelligent Key unit connector while
operating push-button ignition switch.

OK or NG

OK

>> Check connector condition.

NG

>> GO TO 2.

2. 

CHECK PDU SIGNAL CIRCUIT

1.

Disconnect Intelligent Key unit, PDU connectors.

2.

Check continuity between Intelligent Key unit connector and
PDU connector.

3.

Check continuity between PDU connector and ground.

OK or NG

OK

>> Replace Intelligent Key unit.

NG

>> Repair or replace harness between Intelligent Key unit or PDU.

A

B

Continuity 

PDU connector

Terminal

Intelligent Key unit 

connector

Terminal

M30

1

M33

42

Yes

8

45

PDU connector

Terminal

Continuity

M30

1

Ground

No

8

PIIB6125E

Intelligent Key 
unit connector

Terminal

Push-button igni-

tion switch posi-

tion

Voltage (V)

(Approx)

(+)

(-)

M33

44

Ground part of 

push-button 

ignition switch

LOCK position

12

ACC position

12

ON position

0

PIIB6126E

A

B

Continuity

PDU connec-

tor

Terminal

Intelligent Key 
unit connector

Terminal

M30

4

M33

44

Yes

PDU connector

Terminal

Continuity

M30

4

Ground

No

PIIB6127E

PG-44

PDU (POWER DISTRIBUTION UNIT)

Removal and Installation of PDU

NKS004EQ

REMOVAL

1.

Removal the combination meter. Refer to 

DI-27, "Removal and Installation of Combination Meter"

 .

2.

Disconnect PDU unit connector, remove screw and PDU.

INSTALLATION

Installation is in the reverse order of removal.

PIIB6281E