Content .. 933 934 935 936 ..

Nissan Quest E52. Manual - part 935

PCS

PRECAUTIONS

PCS-37

< PRECAUTION >

[POWER DISTRIBUTION SYSTEM]

PRECAUTION

PRECAUTIONS

Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"

INFOID:0000000009652870

The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the “SRS AIR BAG” and “SEAT BELT” of this
Service Manual.

WARNING:

Always observe the following items for preventing accidental activation.
• To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in

the event of a collision that would result in air bag inflation, all maintenance must be performed by
an authorized NISSAN/INFINITI dealer.

• Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal

injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag
Module, see “SRS AIR BAG”.

• Never use electrical test equipment on any circuit related to the SRS unless instructed to in this Ser-

vice Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or harness
connectors.

PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS

WARNING:

Always observe the following items for preventing accidental activation.
• When working near the Air Bag Diagnosis Sensor Unit or other Air Bag System sensors with the

ignition ON or engine running, never use air or electric power tools or strike near the sensor(s) with
a hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly causing
serious injury.

• When using air or electric power tools or hammers, always switch the ignition OFF, disconnect the

battery, and wait at least 3 minutes before performing any service.

Precautions for Removing Battery Terminal

INFOID:0000000009995803

• When removing the 12V battery terminal, turn OFF the ignition

switch and wait at least 30 seconds.
NOTE:
ECU may be active for several tens of seconds after the ignition
switch is turned OFF. If the battery terminal is removed before ECU
stops, then a DTC detection error or ECU data corruption may
occur.

• For vehicles with the 2-batteries, be sure to connect the main bat-

tery and the sub battery before turning ON the ignition switch.
NOTE:
If the ignition switch is turned ON with any one of the terminals of
main battery and sub battery disconnected, then DTC may be
detected.

• After installing the 12V battery, always check "Self Diagnosis Result" of all ECUs and erase DTC.

NOTE:
The removal of 12V battery may cause a DTC detection error.

SEF289H

PCS-38

< SYSTEM DESCRIPTION >

[POWER DISTRIBUTION SYSTEM]

COMPONENT PARTS

SYSTEM DESCRIPTION

COMPONENT PARTS

Component Parts Location

INFOID:0000000009652871

JMMIA0860ZZ

No.

Component

Description

BCM

• BCM controls power distribution system.
• BCM judges ignition switch position by push-button ignition switch (push switch) and vehicle con-

dition.

• BCM checks the ignition switch position internally.
Refer to

BCS-4, "BODY CONTROL SYSTEM : Component Parts Location"

for detailed installation

location.

Stop lamp relay

Stop lamp switch detects that brake pedal is depressed, and stop lamp relay transmits the signal to
BCM.
Refer to

BRC-9, "Component Parts Location"

for detailed installation location.

Push-button ignition
switch

Push-button ignition switch (push switch) is pressed, and transmits the status signal to BCM and
IPDM E/R.

CVT shift selector (deten-
tion switch)

CVT shift selector (detention switch) detects shift lever status, transmits detention switch signal to
BCM.
Refer to

TM-16, "SHIFT LOCK SYSTEM : Component Parts Location"

for detailed installation loca-

tion.

Transmission range
switch

Transmission range switch detects shift position P or N, transmits P/N position signal to BCM.
Refer to

TM-10, "CVT CONTROL SYSTEM : Component Parts Location"

for detailed installation lo-

cation.

IPDM E/R

• IPDM E/R detects push-button ignition switch (push switch) status, and transmits push-button ig-

nition switch status signal (CAN) to BCM.

• IPDM E/R receives ignition relay (IPDM E/R) control signal and ignition switch ON signal (CAN)

from BCM, and controls ignition relay (built in IPDM E/R)

Refer to

PCS-4, "IPDM E/R : Component Parts Location"

for detailed installation location.

Blower relay (built in fuse
block)

• Blower relay is controled by BCM.
• Blower relay supplies the ignition switch ON power supply or the ignition switch ON signal to air

conditiooning system when ignition switch is turned ON.

• BCM compares status of blower relay control signal and ignition switch positon judged by BCM.

Accessory relay (built in
fuse block)

• Accessory relay is controled by BCM.
• Accessory relay supplies the accessory power supply or the ignition switch ACC signal to each

ECU when ignition switch is turned ACC or ON.

• BCM compares status of accessory relay control signal, and ignition switch position judged by

BCM.

Ignition relay (built in fuse
block)

• Ignition relay is controled by BCM.
• Ignition relay supplies the ignition switch ON power supply or the ignition switch ON signal to each

ECU and system when ignition switch is turned ON.

• BCM compares status of ignition relay control signal and ignition switch positon judged by BCM.
• BCM monitors the ignition relay operating status by the ignition relay feedback signal.

PCS

SYSTEM

PCS-39

< SYSTEM DESCRIPTION >

[POWER DISTRIBUTION SYSTEM]

SYSTEM

POWER DISTRIBUTION SYSTEM

POWER DISTRIBUTION SYSTEM : System Description

INFOID:0000000009652872

SYSTEM DIADRAM

SYSTEM DESCRIPTION

• PDS (POWER DISTRIBUTION SYSTEM) is the system that BCM controls with the operation of the push-

button 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 condition.
- Intelligent Key is in the detection area of the inside key antenna.
- Intelligent Key backside is contacted to push-button ignition switch.
• The push-button ignition switch operation is input to BCM as a signal. BCM changes the ignition switch posi-

tion according to the status and operates the following relays to supply power to each power circuit.

- Ignition relay (IPDM E/R)
- Ignition relay [fuse block (J/B)]
- Accessory relay
- Blower relay
• The ignition switch position can be confirmed with the lighting of the LOCK/ACC/ON indicator lamp in the

push-button ignition switch.

BATTERY SAVER SYSTEM

When all the following conditions are met for 60 minutes, the battery saver system will cut off the power supply
(ignition switch position ACC

→

OFF) to prevent battery discharge.

• The ignition switch is in the ACC position
• All doors are closed
• Selector lever is in the P position

Reset Condition of Battery Saver System

If any of the following conditions are met the battery saver system is released.
• Opening any door
• Operating with door request switch on door lock
• Operating with Intelligent Key on door lock
• Change ignition switch position to ACC position from OFF position by pressing push-button ignition switch.

IGNITION SWITCH POSITION CHANGE TABLE BY PUSH-BUTTON IGNITION SWITCH OPERA-
TION

Refer to

SEC-10, "INTELLIGENT KEY SYSTEM/ENGINE START FUNCTION : System Description"

JMMIA0861GB

PCS-40

< SYSTEM DESCRIPTION >

[POWER DISTRIBUTION SYSTEM]

SYSTEM

Fail-safe

INFOID:0000000009652873

FAIL-SAFE CONTROL BY DTC

BCM performs fail-safe control when any DTC are detected.

REAR WIPER MOTOR PROTECTION

BCM detects the rear wiper stopping position according to the rear wiper stop position signal.
When the rear wiper stop position signal does not change for more than 5 seconds while driving the rear
wiper, BCM stops power supply to protect the rear wiper motor.

Condition of cancellation

More than 1 minute is passed after the rear wiper stop.

Turn rear wiper switch OFF.

Operate the rear wiper switch or rear washer switch.

FAIL-SAFE CONTROL OF COMBINATION SWITCH READING FUNCTION CAUSED BY LOW
POWER SUPPLY VOLTAGE

If voltage of battery power supply lower, BCM maintains combination switch reading to the status when input
voltage is less than approximately 9 V.
NOTE:
When voltage of battery power supply is approximately 9 V or more, combination switch reading function
returns to normal operation.

Display contents of CONSULT

Fail-safe

Cancellation

B2192: ID DISCORD BCM-ECM

Inhibit engine cranking

Erase DTC

B2193: CHAIN OF BCM-ECM

Inhibit engine cranking

Erase DTC

B2195: ANTI-SCANNING

Inhibit engine cranking

Ignition switch ON

→

OFF

B2196: DONGLE NG

Inhibit engine cranking

Erase DTC

B2198: NATS ANTENNA AMP

Inhibit engine cranking

Erase DTC

B2608: STARTER RELAY

Inhibit engine cranking

500 ms after the following signal communication status becomes con-
sistent
• Starter motor relay control signal
• Starter relay status signal (CAN)

B260F: ENG STATE SIG LOST

Inhibit engine cranking

When any of the following conditions are fulfilled
• Ignition switch changes to ACC
• Receives engine status signal (CAN)

B26F1: IGN RELAY OFF

Inhibit engine cranking

When the following conditions are fulfilled
• Ignition switch ON signal (CAN: Transmitted from BCM): ON
• Ignition switch ON signal (CAN: Transmitted from IPDM E/R): ON

B26F2: IGN RELAY ON

Inhibit engine cranking

When the following conditions are fulfilled
• Ignition switch ON signal (CAN: Transmitted from BCM): OFF
• Ignition switch ON signal (CAN: Transmitted from IPDM E/R): OFF

B26F3: START CONT RLY ON

Inhibit engine cranking

When the following conditions are fulfilled
• Starter control relay signal (CAN: Transmitted from BCM): OFF
• Starter control relay signal (CAN: Transmitted from IPDM E/R): OFF

B26F4: START CONT RLY OFF

Inhibit engine cranking

When the following conditions are fulfilled
• Starter control relay signal (CAN: Transmitted from BCM): ON
• Starter control relay signal (CAN: Transmitted from IPDM E/R): ON

B26F7: BCM

Inhibit engine cranking
by Intelligent Key sys-
tem

When room antenna and luggage room antenna functions normally

Content .. 933 934 935 936 ..