Nissan Maxima Service and Repair Manual: Power distribution system
System Description
INPUT/OUTPUT SIGNAL CHART

SYSTEM DESCRIPTION
- POWER DISTRIBUTION SYSTEM (PDS) is the system that BCM controls
with the operation of the pushbutton
ignition switch and performs the power distribution to each power circuit.
This system is used instead
of the mechanical power supply changing mechanism with the operation of the
conventional key cylinder.
- The push-button ignition switch can be operated when Intelligent
Key is in the following conditions. Refer to
Engine Start Function for details.
- Intelligent Key is in the detection area of the interior antenna
- Insert Intelligent Key in to the key slot
- The push-button ignition switch operation is input to BCM as a
signal. BCM changes the power supply position
according to the status and operates the following relays to supply power to
each power circuit.
- Ignition relay-1 (inside IPDM E/R)
- Ignition relay-2 (inside fuse block (J/B))
- ACC relay (inside fuse block (J/B))
- Front blower motor relay
NOTE:
The engine switch operation changes due to the conditions of brake pedal, CVT
selector lever and vehicle
speed.
- The power supply position can be confirmed with the lighting of
the indicators near the push-button ignition
switch.
PUSH-BUTTON IGNITION SWITCH OPERATION PROCEDURE
The power supply position changing operation can be performed with the
following operation.
NOTE:
- When an Intelligent Key is within the detection area of inside
key antenna and when it is inserted in 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
- 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 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
the 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)
- IPDM E/R E16, E17, E18 (contains
IGN relay-1)
- A. Fuse block (J/B) M3, M4, M5, E6
B. IGN relay-2
C. ACC relay-1
D. Front blower motor relay
- Push-button ignition switch M38
Component Description

COMMON ITEM
COMMON ITEM : CONSULT Function (BCM - COMMON ITEM)
APPLICATION ITEM
CONSULT performs the following functions via CAN communication with BCM.
SYSTEM APPLICATION
BCM can perform the ...
Other materials:
Ignition signal
Description
The ignition signal from the ECM is sent to and amplified by the power
transistor. The power transistor turns
ON and OFF the ignition coil primary circuit. This ON/OFF operation induces the
proper high voltage in the coil
secondary circuit.
Component Function Check
1.INSPECTIO ...
ECU diagnosis information
CLIMATE CONTROLLED SEAT CONTROL UNIT
Reference Value
TERMINAL LAYOUT
PHYSICAL VALUES
Fail-safe
Climate controlled seat control unit equips fail-safe function.
When a malfunction occurs in the systems shown as per the following,
climate controlled seat control unit
stops output. ...
Lifting motor (front)
Description
The lifting motor (front) is installed to the seat frame.
The lifting motor (front) is activated with the driver seat
control unit.
The lifter (front) is moved upward/downward by changing the rotation
direction of lifting motor (front).
Component Function Check
1. CHECK ...