Nissan Maxima Service and Repair Manual: System description
INTELLIGENT KEY SYSTEM/ENGINE START FUNCTION
System Diagram
System Description
INPUT/OUTPUT SIGNAL CHART
SYSTEM DESCRIPTION
PRECAUTIONS FOR INTELLIGENT KEY SYSTEM
- In the Intelligent Key system of model A35, the
transponder [the chip for NVIS (NATS) ID verification]
is integrated into the Intelligent Key. (For the conventional models, it is
integrated into the mechanical
key.) Therefore, the mechanical key cannot perform the ID verification, and
thus it cannot start
the engine. Instead, the NVIS (NATS) ID verification can be performed by
inserting the Intelligent Key
into the key slot, and then it can start the engine.
OPERATION WHEN INTELLIGENT KEY IS CARRIED
- When the push-button ignition switch is pressed and brake pedal is
depressed, the BCM signals the
inside key antenna and transmits the request signal to the Intelligent Key.
- The Intelligent Key sends the request signal and transmits the
Intelligent Key ID signal to the BCM via the
remote keyless entry receiver.
- The BCM receives the Intelligent Key ID signal and verifies it
with the registered ID.
- BCM turns ACC relay ON and transmits the ignition power supply ON
signal to IPDM E/R.
- IPDM E/R turns the ignition relay ON and starts the ignition power
supply.
- BCM confirms that the shift position is P or N.
- BCM transmits the starter request signal via CAN communication to
IPDM E/R and turns the starter relay
in IPDM E/R ON if BCM judges that the engine start condition is satisfied.
- IPDM E/R turns the starter control relay ON when receiving the
starter request signal.
- Battery power is supplied through the starter relay and the
starter control relay to operate the starter motor
and to start the cranking.
CAUTION:
If a malfunction is detected in the Intelligent Key system, the "KEY"
warning lamp in the combination
meter illuminates. At that time, the engine cannot be started.
- When BCM received feedback signal from ECM acknowledging the
engine has been initiated, the BCM
transmits a stop signal to IPDM E/R and stops the cranking by turning OFF
the starter motor relay. (If the
engine initiating has failed, the cranking will stop automatically within 5
seconds.)
CAUTION:
When the Intelligent Key is carried outside of the vehicle (inside key
antenna detection area) with
the power supply in ACC or ON position, even if the engine start condition*
is satisfied, the engine
cannot be started.
*: For the engine start condition, refer to "PUSH-BUTTON IGNITION SWITCH
OPERATION PROCEDURE".
OPERATION RANGE
Engine can be started when Intelligent Key is inside the vehicle. However,
sometimes engine might not start
when Intelligent Key is on instrument panel or in glove box.
OPERATION WHEN KEY SLOT IS USED
When the Intelligent Key battery is discharged, it performs the NVIS (NATS)
ID verification between the integrated
transponder and BCM by inserting the Intelligent Key into the key slot, and then
the engine can be
started.
For details relating to starting the engine using key slot, refer to SEC-10,
"System Description".
BATTERY SAVER SYSTEM
When all the following conditions are met for 60 minutes, the battery saver
system will cut off the power supply
to prevent battery discharge.
- The ignition switch is in the ACC position
- All doors are closed
- CVT selector lever is in the P position
- No Intelligent Key failures (Intelligent Key warning indicator is
not ON)
Reset Condition of Battery Saver System
In order to prevent the battery from discharging, the battery saver system
will cut off the power supply when all
doors are closed, the selector lever is in P position and the ignition switch is
left in ACC position for 1 hour. If
any of the following conditions are met, the battery saver system is released:
- Opening any door
- Operating with request switch on door lock
- - Operating with Intelligent Key on door lock
Press push-button ignition switch and ignition switch will change to ACC
position from OFF position.
PUSH-BUTTON IGNITION SWITCH OPERATION PROCEDURE
The power supply position changing operation can be performed with the
following operations:
NOTE:
- When an Intelligent Key is within the detection area
of inside key antenna or when it is inserted to the key slot, it is
equivalent to the operations below.
- When starting the engine, the BCM monitors under the
engine start conditions.
- Brake pedal operating condition
- CVT selector lever position
- Vehicle speed
- Engine status
- Unless each start condition is fulfilled, the engine
will not respond regardless of how many times the engine switch is pressed.
At that time, illumination repeats the position in the order of
LOCK→ACC→ON→OFF.
*1: When the CVT selector lever position is N position, the engine start
condition is different according to the vehicle speed.
- At vehicle speed of 4 km/h (2 MPH) or less, the engine can start
only when the brake pedal is depressed.
- At vehicle speed of 4 km/h (2 MPH) or more, the engine can start
even if the brake pedal is not depressed. (It is the same as "Engine
stall return operation while driving".)
*2: When the CVT selector lever position is in any position other than P
position and when the vehicle speed is 5 km/h (3 MPH) or more,
the engine stop condition is different.
- Press and hold the push-button ignition switch for 2 seconds or
more. (When the push-button ignition switch is pressed for too short a time,
the operation may be invalid, so properly press and hold to prevent an
incorrect operation.)
- Press the push-button ignition switch 3 times or more within 1.5
seconds. (Emergency stop operation)
Component Parts Location
- BCM M16, M17, M18, M19, M21
(view with instrument panel removed)
- Front door switch LH B8
RH B108
- Rear door switch LH B18
RH B116
- TCM F15
- ECM E10
- Push button ignition switch M38
- Stop lamp switch E38
(view with lower driver instrument
panel removed)
- Combination meter M24
- Security indicator lamp
- Information display
- Remote keyless entry receiver M27
(view with instrument panel removed)
- Key slot M40
- Front console antenna M41
(view with center console removed)
- Rear parcel shelf antenna B29
- CVT shift selector M78
Component Description
ECM RE-COMMUNICATING FUNCTION
ECM RE-COMMUNICATING FUNCTION : Description
the ECM has been replaced with a new one (*1).
*1: New one means an ECM which has never been energized on-board.
(In t ...
System Diagram
System Description
INPUT/OUTPUT SIGNAL CHART
SYSTEM DESCRIPTION
The NVIS (NATS) is an anti-theft system. By registering an
Intelligent Key ID into the vehicle, it prevents ...
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Trouble diagnosis - specification value
Description
The specification (SP) value indicates the tolerance of the value that is
displayed in "SPEC" of "DATA MONITOR"
mode of CONSULT during normal operation of the Engine Control System. When the
value in "SPEC" in
"DATA MONITOR" mode is NOT within the SP value, the Engine Control Sy ...
C1712 - C1715, C1720 - C1723, C1724 - C1727 transmitter malfunction
Description
One or more transmitters are malfunctioning internally.
DTC Logic
NOTE: The Signal Tech II Tool (J-50190) can be used
to perform the following functions. Refer to the Signal Tech II User Guide
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Activate and display TPMS transmitter IDs
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Component Function Check
Symptom
Memory function does not operate normally.
The setting is not maintained. (It returns to the initial
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1.CHECK OPERATION
Set temperature control switch to 32C (90F).
Press the OFF switch.
Turn the ignition switch OFF.
Turn the ignitio ...