Infiniti M35/M45 Y50. Manual - part 274

 

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Infiniti M35/M45 Y50. Manual - part 274

 

 

INTELLIGENT KEY SYSTEM/ENGINE START FUNCTION

BL-165

C

D

E

F

G

H

J

K

L

M

A

B

BL

3. 

CHECK POWER SUPPLY CIRCUIT 2

1.

Connect Intelligent Key unit and power distribution unit connector.

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.6, located in the fuse block (J/B)]

●

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

DTC B2555 STOP LAMP CIRCUIT

NIS001YS

DIAGNOSIS DESCRIPTION

B2555 stop lamp system monitors the open circuit before the stop lamp switch (models without ICC system),
which detects the brake pedal operation input to the Intelligent Key unit, or ICC brake relay (models with ICC
system). If it detects the open circuit, it judges that it is the malfunction and displays the DTC (Diagnostic Trou-
ble Code)

TERMINALS AND REFERENCE VALUE FOR INTELLIGENT KEY UNIT INPUT

CONSULT-II DATA MONITOR STANDARD VALUE

SELF-DIAGNOSTIC LOGIC

Terminals

Ignition 

switch 

condition

Voltage (V)

(Approx.)

(+)

(–)

Intelligent Key unit 

connector

Terminal

M32

30

Ground

ACC

Battery voltage

OFF

0

PIIB6237E

Termi-

nal 

No.

Wire 

color

Item

Condition

Voltage (V)

(Approx.)

Push-

button 

ignition 

switch 

position

Operation or conditions

63

P

Stop lamp switch

—

Brake pedal depressed

Battery voltage

Brake pedal released

Battery voltage

29

V/R

Stop lamp switch

—

Brake pedal depressed

Battery voltage

Brake pedal released

0

Monitor item

Measuring condition

Reference value

STOP LAMP

Brake pedal is depressed

ON

Brake pedal is released

OFF

DTC

Self-diagnosis name

DTC detecting condition

Possible causes

B2555

STOP LAMP CIRCUIT

5V or less is detected at both the stop lamp switch signal 
input circuit that is input to Intelligent Key unit and the 
monitor input before stop lamp switch

●

10A fuse

●

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

BL-166

INTELLIGENT KEY SYSTEM/ENGINE START FUNCTION

DIAGNOSTIC PROCEDURE

1. 

CHECK STOP LAMP SIGNAL

 With CONSULT-II

Check (“STOP LAMP SW”) in DATA MONITOR mode with CONSULT-II.

 Without CONSULT-II

Check voltage between Intelligent Key unit connector and ground.

OK or NG

OK

>> XXX

NG

>> Check the following.

●

10A fuse [No.20, located in the fuse block (J/B)]

●

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

DTC B2556 ENG START SW

NIS001YT

DIAGNOSIS DESCRIPTION

When the push-button ignition switch input, which inputs to the Intelligent Key unit, continues for 100 seconds
or more, B2556 push-button ignition switch judges that it is the malfunction and displays the DTC (Diagnostic
Trouble Code)

TERMINALS AND REFERENCE VALUE FOR INTELLIGENT KEY UNIT

SELF-DIAGNOSTIC LOGIC

When depressing the break pedal

STOP LAMP SW

: ON

PIIB6238E

Terminals

Voltage (V)

(Approx.)

(+)

(–)

Intelligent Key unit 

connector

Terminal

M32

63

Ground

Battery voltage

PIIB8927E

Termi-

nal 

No.

Wire 

color

Item

Condition

Voltage (V)

(Approx.)

Push-

button 

ignition 

switch 

position

Operation or conditions

39

BR/W

Push-button ignition 
switch

—

Push-button ignition switch is pressed

0

Push-button ignition switch is released

Battery voltage

DTC

Self-diagnosis 

name

DTC detecting condition

Possible causes

B2556

ENG START SW

Input signal from push-button ignition switch to Intelli-
gent Key unit continues for 100 seconds or more

●

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

●

Push-button ignition switch

INTELLIGENT KEY SYSTEM/ENGINE START FUNCTION

BL-167

C

D

E

F

G

H

J

K

L

M

A

B

BL

DIAGNOSTIC PROCEDURE

1. 

CHECK HARNESS CONTINUITY

1.

Turn ignition switch OFF.

2.

Disconnect Intelligent Key unit and push-button ignition switch connector.

3.

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

4.

Check continuity between Intelligent Key unit connector and
ground.

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace harness.

2. 

CHECK PUSH-BUTTON IGNITION SWITCH

Check push-button ignition switch.

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

>> Replace push-button ignition switch.

DTC B2557 VEHICLE SPEED

NIS001YU

DIAGNOSIS DESCRIPTION

B2557 vehicle speed signal compares the vehicle speed input from the unified meter and A/C amp. and ABS
via CAN communication and the vehicle signal (8 pulses) from the unified meter and A/C amp. If there is the
difference between each vehicle speed input, it judges that it is the malfunction and displays the DTC (Diag-
nostic Trouble Code).

A

B

Continuity 

Intelligent Key 
unit connector

Terminal

Push-button igni-

tion switch 

connector

Terminal

M32

39

M27

4

Yes

A

Ground

Continuity 

Intelligent Key unit connector

Terminal

M32

39

No

PIIB6240E

Terminal

Push-button igni-

tion switch condi-

tion

Continuity

Push-button ignition switch

1

4

Pushed

Yes

Released

No

PIIB6241E

BL-168

INTELLIGENT KEY SYSTEM/ENGINE START FUNCTION

TERMINALS AND REFERENCE VALUE FOR INTELLIGENT KEY UNIT

SELF-DIAGNOSTIC LOGIC

DIAGNOSTIC PROCEDURE

1. 

CHECK VEHICLE SPEED SIGNAL 

Check the signal 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

>> GO TO 2.

Termi-

nal 

No.

Wire 

color

Item

Condition

Voltage (V)

(Approx.)

Push-

button 

ignition 

switch 

position

Operation or conditions

35

LG

Vehicle speed signal

ON

At speedometer operation (vehicle 
speed approx. 40 km/h)

PKIA1935E

DTC

Self-diagnosis 

name

DTC detecting condition

Possible causes

B2557

VEHICLE SPEED

When comparing the vehicle speed signal, that is input to the 
Intelligent Key unit with power supply position ON and when 
one signal displays 10 km/h or more, the condition that another 
signal displays less than 5 km/h continues for 10 seconds or 
more

●

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

●

Unified meter and A/C amp.

Terminals

Condition

Signal

(Reference value)

(+)

(–)

Intelligent 

Key unit 

connector

Terminal

M32

35

Ground

Speed meter 

operated 

[When vehi-
cle speed is 

Approx. 40 

km/h 

(25MPH)]

PIIB6242E

PKIA1935E

 

 

 

 

 

 

 

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