Nissan Altima L32. Instruction — part 997

PCS-52

< BASIC INSPECTION >

[POWER DISTRIBUTION SYSTEM]

DIAGNOSIS AND REPAIR WORKFLOW

4.

CHECK POWER SUPPLY INDICATOR SWITCHING

Press push-button ignition switch and check that the position indicator switches from LOCK, through ACC to

ON when steering is locked.
Is each position indicator illuminating?

YES

>> GO TO 5.

NO

>> Refer to

PCS-80, "Component Function Check"

.

5.

CHECK VEHICLE SECURITY SYSTEM

Check the vehicle security system for normal operation. Refer to

SEC-13, "Vehicle Security Operation

Check"

.

Are the inspection results normal?

YES

>> Inspection End.

NO

>> Repair vehicle security system as necessary.

PCS

POWER DISTRIBUTION SYSTEM

PCS-53

< FUNCTION DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

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P

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FUNCTION DIAGNOSIS

POWER DISTRIBUTION SYSTEM

System Description

INFOID:0000000004202429

INPUT/OUTPUT SIGNAL CHART

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. 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 posi-

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

- Ignition relay (inside IPDM E/R)

- Ignition relay (inside fuse block)

- ACC relay

- Blower fan 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 models)

- CVT selector lever position (CVT models)

- Clutch pedal operating condition (M/T models)

- 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.

Switch

Input Signal to BCM

BCM system

Actuator

Push-button ignition switch

Push switch

Power destribution system

• Ignition relay (IPDM E/R)
• Ignition relay (fuse block)
• ACC relay
• Blower relay

CVT device (CVT models)

P range

PNP switch (CVT models)

N, P range

Clutch interlock switch (M/T models)

Clutch ON/OFF

Stop lamp switch

Brake ON/OFF

Power supply position

Engine start/stop condition

Push-button ignition switch op-

eration frequency

Brake pedal (CVT)/clutch pedal

(M/T)

CVT selector lever position

LOCK

→ ACC

Not depressed

Any position

1

LOCK

→ ACC → ON

Not depressed

Any position

2

LOCK

→ ACC → ON →

OFF

Not depressed

Any position

3

PCS-54

< FUNCTION DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

POWER DISTRIBUTION SYSTEM

*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 or less, the engine can start only when the brake pedal is depressed.
• At vehicle speed of 4 km/h 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

INFOID:0000000004202430

LOCK

→ START

ACC

→ START

ON

→ START

(Engine start)

Depressed

P or N position (*1)

1

[If the switch is pressed once,

the engine starts from any pow-
er supply position (LOCK, ACC,

and ON)]

Engine is running

→

OFF
(Engine stop)

—

Any position

1

Engine is running

→

ACC
(Engine stop)

—

Any position other than P (*2)

1

Engine stall return oper-
ation while driving

—

N position

1

Power supply position

Engine start/stop condition

Push-button ignition switch op-

eration frequency

Brake pedal (CVT)/clutch pedal

(M/T)

CVT selector lever position

ALCIA0019ZZ

PCS

POWER DISTRIBUTION SYSTEM

PCS-55

< FUNCTION DIAGNOSIS >

[POWER DISTRIBUTION SYSTEM]

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Component Description

INFOID:0000000004202431

1.

BCM M16, M17, M18, M19, M21 (view
with instrument panel removed)

2.

IPDM E/R E16, E17, E18 (contains
IGN relay-1)

3.

A. Fuse block (J/B) M3, M4, M5, E6
B. IGN relay-2
C. ACC relay
D. Blower motor relay

4.

Push-button ignition switch M38

⇐: Front

BCM

Reference

IPDM E/R

PCS-7

Ignition relay-1 (Built-in IPDM E/R)

PCS-74

Ignition relay-2 (Built-in fuse block)

PCS-71

Accessory relay

PCS-63

Blower relay

PCS-68

Stop lamp

SEC-70

Park/neutral position switch

SEC-84

Push-button ignition switch

SEC-72