Infiniti M35/M45 Y50. Manual - part 273

INTELLIGENT KEY SYSTEM/ENGINE START FUNCTION

BL-161

C

D

E

F

G

H

J

K

L

M

A

B

BL

6. 

CHECK COMMUNICATION CIRCUIT 2

1.

Turn ignition switch OFF.

2.

Disconnect Intelligent Key unit and steering lock unit connector.

3.

Check continuity between Intelligent Key unit connector and steering lock unit connector.

4.

Check continuity 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

>> Repair or replace harness.

DTC B2552 INTELLIGENT KEY

NIS001YP

DIAGNOSIS DESCRIPTION

B2552 Intelligent Key unit internal malfunction judges NG by self-detecting the Intelligent Key unit internal mal-
function.
If this DTC (Diagnostic Trouble Code) is displayed, replace the Intelligent Key unit and perform the specified
registration procedure. Refer to the Technical Bulletin.

DTC B2553 IGN POWER CIRCUIT

NIS001YQ

DIAGNOSIS DESCRIPTION

Though the power supply switching control to ON position by push-button ignition switch operation is per-
formed normally, if there is no ON power supply input to the Intelligent Key unit, B2553 ignition power supply
system judges it is the malfunction and displays the DTC (Diagnostic Trouble Code)

TERMINAL AND REFERENCE VALUE FOR INTELLIGENT KEY UNIT

CONSULT-II DATA MONITOR STANDARD VALUE

A

B

Continuity 

Intelligent Key 
unit connector

Terminal

Steering lock unit 

connector

Terminal

M33

69

M35

3

Yes

70

8

A

Ground

Continuity 

Intelligent Key 
unit connector

Terminal

M33

69

No

70

PIIB8994E

Termi-

nal 

No.

Wire 

color

Item

Condition

Voltage (V)

(Approx.)

Push-

button 

ignition 

switch 

position

Operation or conditions

31

GR

Ignition power supply 
(ON)

ON

Power supply position is in ON or 
START position

Battery voltage

Monitor item

Measuring condition

Reference value

ON POS

Power supply position is in ON position

ON

Power supply position is in any position other than ON

OFF

BL-162

INTELLIGENT KEY SYSTEM/ENGINE START FUNCTION

SELF-DIAGNOSTIC LOGIC

DIAGNOSTIC PROCEDURE

1. 

CHECK POWER SUPPLY CIRCUIT

 With CONSULT-II

Check (“IGN ON SW”) in DATA MONITOR mode with CONSULT-II.

 Without CONSULT-II

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 Intelligent Key unit power supply circuit for open or short.

DTC B2554 ACC POWER CIRCUIT

NIS001YR

DIAGNOSIS DESCRIPTION

B2554 ACC power supply circuit monitors the following 2 signals.

●

Though the power supply switching control to ACC position by push-button ignition switch operation is
performed normally, if there is no ACC power supply input to the Intelligent Key unit, it judges that it is the
malfunction and displays the DTC (Diagnostic Trouble Code)

●

When performing the power supply switching control to ACC position by push-button ignition switch oper-
ation, if the power supply position switching cannot be performed because the wake-up signal is not
entered into PDU (Power Distribution Unit), it judges that it is the malfunction and displays the DTC (Diag-
nostic Trouble Code)

DTC

Self-diagnosis 

name

DTC detecting condition

Possible causes

B2553

IGN POWER CIR-

CUIT

Though the changing control to ON position by push-
button ignition switch operation is performed normally, 
ON position power supply to the Intelligent Key unit is 
not supplied

●

10A fuse

●

Harness and connector
(Open or shorted in the circuit)

When ignition switch is turned to ON

IGN ON SW

: ON 

PIIB6233E

Terminals

Ignition switch 

condition

Voltage (V)

(Approx.)

(+)

(–)

Intelligent Key 
unit connector

Terminal 

M32

31

Ground

ON

Battery voltage

OFF

0

PIIB6234E

INTELLIGENT KEY SYSTEM/ENGINE START FUNCTION

BL-163

C

D

E

F

G

H

J

K

L

M

A

B

BL

TERMINALS AND REFERENCE VALUE FOR INTELLIGENT KEY UNIT

CONSULT-II DATA MONITOR STANDARD VALUE

SELF-DIAGNOSTIC LOGIC

Termi-

nal 

No.

Wire 

color

Item

Condition

Voltage (V)

(Approx.)

Push-

button 

ignition 

switch 

position

Operation or conditions

30

L/W

Ignition power supply 
(ACC)

ACC

Power supply position is in ACC posi-
tion

Battery voltage

42

P

PDU wake up signal

LOCK

At sleep (30 seconds or more after all 
doors are closed under the condition 
that the power supply position is in the 
LOCK position)

Battery voltage

—

At wake-up (Open driver door)

0

Monitor item

Measuring condition

Reference value

ACC POS

Power supply position is in ACC position

ON

Power supply position is in any position other than ACC

OFF

DTC

Self-diagnosis 

name

DTC detecting condition

Possible causes

B2554

ACC POWER 
CIRCUIT

●

Though the changing control to ACC position by push-button 
ignition switch operation is performed normally, ACC position 
power supply to the Intelligent Key unit is not supplied

●

The power supply position switching cannot be performed 
because the wake-up signal is not entered into PDU (Power 
Distribution Unit) during position changing control to ACC 
position by push-button ignition switch operation

●

Fuse

●

Harness and connector
(Open or shorted in the cir-
cuit)

BL-164

INTELLIGENT KEY SYSTEM/ENGINE START FUNCTION

DIAGNOSTIC PROCEDURE

1. 

CHECK POWER SUPPLY CIRCUIT 1

 With CONSULT-II

Check (“IGN ACC SW”) in DATA MONITOR mode with CONSULT-II.

 Without CONSULT-II

Check voltage between Intelligent Key unit connector and ground.

OK or NG

OK

>> ACC power circuit is OK. Check the self-diagnosis

results using CONSULT-II again.

NG

>> GO TO 2.

2. 

CHECK COMMUNICATION CIRCUIT 

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 3.

NG

>> Repair or replace harness.

When ignition switch is turned to ACC

ACC ON SW

: ON

PIIB6235E

Terminals

Ignition 

switch 

condition

Voltage (V)

(Approx.)

(+)

(–)

Intelligent Key unit 

connector

Terminal

M32

30

Ground

ACC

Battery voltage

OFF

0

PIIB6237E

A

B

Continuity 

Intelligent Key 
unit connector

Terminal

Power distribution 

unit connector

Terminal

M33

42

M30

1

Yes

A

Ground

Continuity 

Intelligent Key unit connector

Terminal

M33

42

No

PIIB6236E