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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