Infiniti M35/M45 Y50. Manual - part 276

INTELLIGENT KEY SYSTEM/ENGINE START FUNCTION

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TERMINALS AND REFERENCE VALUE
Intelligent Key Unit

PDU (Power Distribution Unit)

SELF-DIAGNOSTIC LOGIC

DIAGNOSTIC PROCEDURE

1. 

CHECK HARNESS CONTINUITY 1

1.

Turn ignition switch OFF.

2.

Disconnect Intelligent Key unit and power distribution unit connector.

3.

Check continuity between Intelligent Key unit connector and power distribution unit connector.

4.

Check continuity between Intelligent Key unit connector and
ground.

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace harness.

Termi-

nal 

No.

Wire 

color

Item

Condition

Voltage (V)

(Approx.)

Push-

button 

ignition 

switch 

position

Operation or conditions

3

Y

IPDM E/R current sig-
nal

START

At starter motor cranking

5

LOCK

Any condition other than above

2

Ter-

minal 

No.

Wire 

color

Item

Condition

Voltage (V)

(Approx.)

Push-

button 

ignition 

switch 

position

Operation or conditions

13

R

Starter relay

START

At starter motor cranking

Battery voltage

—

Any condition other than above

4

DTC

Self-diagnosis name

DTC detecting condition

Possible causes

B2560

START POW SUP 
CIRC

It is detected that the power is supplied to the 
starter motor without the engine start request from 
the Intelligent Key unit

●

Harness and connector
(Open in the circuit between 
the units)

●

PDU

●

IPDM E/R

A

B

Continuity 

Intelligent Key 
unit connector

Terminal

Power distribution 

unit connector

Terminal

M32

3

M30

11

Yes

A

Ground

Continuity 

Intelligent Key unit connector

Terminal

M32

3

No

PIIB6249E

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INTELLIGENT KEY SYSTEM/ENGINE START FUNCTION

2. 

CHECK HARNESS CONTINUITY 2

1.

Disconnect IPDM E/R connector.

2.

Check continuity between power distribution unit connector and IPDM E/R connector.

3.

Check continuity between power distribution unit connector and
ground.

OK or NG

OK

>> Replace IPDM E/R.

NG

>> Repair or replace harness.

A

B

Continuity 

Power distribution 

unit connector

Terminal

IPDM E/R
connector

Terminal

M31

13

E4

4

Yes

A

Ground

Continuity 

Power distribution unit 

connector

Terminal

M31

13

No

PIIB6250E

INTELLIGENT KEY SYSTEM/ENGINE START FUNCTION

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DTC B2562 LOW VOLTAGE

NIS001YY

DIAGNOSIS DESCRIPTION

B2562 battery low voltage monitors the battery voltage input to Intelligent Key unit. When the condition that the
voltage is 8.8V or less is detected for 1.5 seconds or more, it judges that it is the malfunction and displays the
DTC (Diagnostic Trouble Code)

TERMINALS AND REFERENCE VALUE FOR INTELLIGENT KEY UNIT

Standard is the measured voltage between each terminal and ground

SELF-DIAGNOSTIC LOGIC

DIAGNOSTIC PROCEDURE

1. 

CHECK BATTERY

Measure the battery output voltage. Make sure that it is 9V or more.

OK or NG

OK

>> GO TO 2.

NG

>> Charge or replace the battery.

Termi-

nal 

No.

Wire 

color

Item

Condition

Voltage (V)

(Approx.)

Push-

button 

ignition 

switch 

position

Operation or conditions

1

SB

Power source (fuse)

—

—

Battery voltage

41

Y

Power source (fuse)

—

—

Battery voltage

57

L

Power source (fuse)

—

—

Battery voltage

DTC

Self-diagnosis name

DTC detecting condition

Possible causes

B2562

LOW VOLTAGE

It is detected for 1.5 seconds or more that the battery volt-
age that is input to the Intelligent Key unit is 8.8V or less

●

Fuse

●

Harness and connector
(Open in the circuit)

BL-176

INTELLIGENT KEY SYSTEM/ENGINE START FUNCTION

2. 

CHECK POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Check voltage between Intelligent Key unit connector and ground.

OK or NG

OK

>> Check the condition of harness and connector. If it is

OK, check the self-diagnosis results using CONSULT-II
again.

NG

>> Check the following.

●

10A fuse [No.22, located in the fuse block (J/B)]

●

Harness for open or short between fuse block and
Intelligent Key unit.

DTC B2563 HI VOLTAGE

NIS001YZ

DIAGNOSIS DESCRIPTION

B2563 battery high voltage monitors the battery voltage input to Intelligent Key unit. When the condition that
the voltage is 18V or more is detected for 90 seconds or more, it judges that it is the malfunction and displays
the DTC (Diagnostic Trouble Code)

TERMINAL AND REFERENCE VALUE FOR INTELLIGENT KEY UNIT

Standard is the measured voltage between each terminal and ground

SELF-DIAGNOSTIC LOGIC

Terminals

Voltage (V)

(Approx.)

(+)

(–)

Intelligent Key unit 

connector

Terminal

M32

1

Ground

Battery voltage

M33

41

57

PIIB6251E

Termi-

nal 

No.

Wire 

color

Item

Condition

Voltage (V)

(Approx.)

Push-

button 

ignition 

switch 

position

Operation or conditions

1

SB

Power source (fuse)

—

—

Battery voltage

41

Y

Power source (fuse)

—

—

Battery voltage

57

L

Power source (fuse)

—

—

Battery voltage

DTC

Self-diagnosis name

DTC detecting condition

Possible causes

B2563

HI VOLTAGE

It is detected for 90 seconds or more that the battery voltage 

that is input to the Intelligent Key unit is 18V or more

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