Nissan Pathfinder (2009 year). Manual - part 83

BCS

BODY CONTROL SYSTEM

BCS-5

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FUNCTION DIAGNOSIS

BODY CONTROL SYSTEM

System Description

INFOID:0000000003935246

OUTLINE

• BCM (Body Control Module) controls the various electrical components. It inputs the information required to

the control from CAN communication and the signal received from each switch and sensor. 

• BCM has combination switch reading function for reading the operation status of combination switches (light,

turn signal, wiper and washer) in addition to a function for controlling the operation of various electrical com-
ponents. It also has the signal transmission function as the passed point of signal and the power consump-
tion control function that reduces the power consumption with the ignition switch OFF.

• BCM is equipped with the diagnosis function that performs the diagnosis with CONSULT-III and various set-

tings.

BCM control function list

System

Refer to

Combination switch reading system

BCS-7, "System Diagram"

Signal buffer system

BCS-12, "System Diagram"

Power consumption control system

BCS-13, "System Diagram"

Auto light system

EXL-12, "System Diagram"

Turn signal and hazard warning lamp system

EXL-17, "System Diagram"

Headlamp system

EXL-7, "System Diagram"

Front fog lamp system (if equipped)

EXL-15, "System Diagram"

Daytime running light system

EXL-9, "System Diagram"

Interior room lamp control system

INL-6, "System Diagram"

Step lamp system

INL-6, "System Diagram"

Interior room lamp battery saver system

INL-6, "System Diagram"

Front wiper and washer system

WW-4, "System Diagram"

Rear wiper and washer system

WW-8, "System Diagram"

Warning chime system

WCS-4, "WARNING CHIME SYSTEM : System Diagram"

Door lock system

• WITH INTELLIGENT KEY SYSTEM: 

DLK-15, "DOOR LOCK AND UN-

LOCK SWITCH : System Diagram"

• WITHOUT INTELLIGENT KEY SYSTEM: 

DLK-213, "DOOR LOCK AND 

UNLOCK SWITCH : System Diagram"

(NATS) Nissan anti-theft system

• WITH INTELLIGENT KEY SYSTEM: 

SEC-13, "System Diagram"

• WITHOUT INTELLIGENT KEY SYSTEM: 

SEC-125, "System Diagram"

Vehicle security system

• WITH INTELLIGENT KEY SYSTEM: 

SEC-17, "System Diagram"

• WITHOUT INTELLIGENT KEY SYSTEM: 

SEC-128, "System Diagram"

Rear window defogger system

DEF-4, "System Diagram"

Remote keyless entry system

DLK-215, "REMOTE KEYLESS ENTRY : System Diagram"

Intelligent Key system (if equipped)

DLK-45, "CONSULT-III Function (INTELLIGENT KEY)"

Power window system

PWC-5, "System Diagram"

RAP (retained accessory power) system

BCS-28, "RETAINED PWR : CONSULT-III Function (BCM - RETAINED 
PWR)"

TPMS (tire pressure monitoring system)

WT-8, "System Diagram"

2009 Pathfinder

BCS-6

< FUNCTION DIAGNOSIS >

BODY CONTROL SYSTEM

Component Parts Location

INFOID:0000000003935247

• BCM M18, M19, M20 (view with instrument panel removed)

LKIA0564E

2009 Pathfinder

BCS

COMBINATION SWITCH READING SYSTEM

BCS-7

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COMBINATION SWITCH READING SYSTEM

System Diagram

INFOID:0000000003935248

System Description

INFOID:0000000003935249

OUTLINE

• BCM reads the status of the combination switch (light, turn signal, wiper and washer) and recognizes the

status of each switch.

• BCM is a combination of 5 output terminals (OUTPUT 1 - 5) and 5 input terminals (INPUT 1 - 5). It reads a

maximum of 20 switch status.

COMBINATION SWITCH MATRIX

LIIA0757E

2009 Pathfinder

BCS-8

< FUNCTION DIAGNOSIS >

COMBINATION SWITCH READING SYSTEM

Combination switch circuit

Combination switch INPUT-OUTPUT system list

NOTE:

Headlamp has a dual system switch.

COMBINATION SWITCH READING FUNCTION

Description

• BCM reads the status of the combination switch at 10 ms interval normally.

NOTE:
BCM reads the status of the combination switch at 20 ms interval when BCM is controlled at low power con-
sumption control mode.

• BCM operates as follows and judges the status of the combination switch.
- INPUT 1 - 5 outputs the voltage waveforms of 5 systems simultaneously.
- It operates the transistor on OUTPUT side in the following order: OUTPUT 5 

→

 4 

→

 3 

→

 2 

→

 1.

System

OUTPUT 1

OUTPUT 2

OUTPUT 3

OUTPUT 4

OUTPUT 5

INPUT 1

—

FR WASHER

FR WIPER LOW

TURN LH

TURN RH

INPUT 2

FR WIPER HI

—

FR WIPER INT

PASSING

HEADLAMP 1

INPUT 3

INT VOLUME 1

RR WASHER

—

HEADLAMP 2

HI BEAM

INPUT 4

RR WIPER INT

INT VOLUME 3

AUTO LIGHT

—

TAIL LAMP

INPUT 5

INT VOLUME 2

RR WIPER

—

FR FOG

—

LIIA0760E

JPMIA0067GB

2009 Pathfinder

BCS

COMBINATION SWITCH READING SYSTEM

BCS-9

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- The voltage waveform of INPUT corresponding to the formed circuit changes according to the operation of

the transistor on OUTPUT side if any (1 or more) switches are ON.

- It reads this change of the voltage as the status signal of the combination switch.

Operation Example

In the following operation example, the combination of the status signals of the combination switch is replaced
as follows: INPUT 1 - 5 to “1 - 5” and OUTPUT 1 - 5 to “A - E”.

Example 1: When a switch (TURN RH switch) is turned ON

• The circuit between INPUT 1 and OUTPUT 5 is formed when the TURN RH switch is turned ON.

• BCM detects the combination switch status signal “1E” when the signal of OUTPUT 5 is input to INPUT 1.
• BCM judges that the TURN RH switch is ON when the signal “1E” is detected.

Example 2: When some switches (turn RH switch, front wiper LO switch) are turned ON

JPMIA0068GB

ALMIA0260GB

2009 Pathfinder

BCS-10

< FUNCTION DIAGNOSIS >

COMBINATION SWITCH READING SYSTEM

• The circuits between INPUT 1 and OUTPUT 5 and between INPUT 1 and OUTPUT 3 are formed when the

TURN RH switch and FR WIPER LOW switch are turned ON.

• BCM detects the combination switch status signal “1CE” when the signals of OUTPUT 3 and OUTPUT 5 are

input to INPUT 1.

• BCM judges that the TURN RH switch and FR WIPER LOW switch are ON when the signal “1CE” is

detected.

WIPER INTERMITTENT DIAL POSITION SETTING (FRONT WIPER INTERMITTENT OPERATION)

BCM judges the wiper intermittent dial 1 - 7 by the status of INT VOLUME 1, 2 and 3 switches.

Component Parts Location

INFOID:0000000003935250

ALMIA0261GB

Wiper intermittent

dial position

Intermittent

operation delay

interval

INT VOLUME switch ON/OFF status  

INT VOLUME 1 switch

INT VOLUME 2 switch

INT VOLUME 3 switch

1

Short

↑

↓

Long

ON

ON

ON

2

ON

ON

OFF

3

ON

OFF

OFF

4

OFF

OFF

OFF

5

OFF

OFF

ON

6

OFF

ON

ON

7

OFF

ON

OFF

ALMIA0308ZZ

2009 Pathfinder

BCS

COMBINATION SWITCH READING SYSTEM

BCS-11

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1.

BCM M18, M19, M20 (view with low-
er instrument panel LH removed)

2.

Combination switch (lighting and 
turn signal switch) M28

3.

Combination switch (wiper and 
washer switch) M28

2009 Pathfinder

BCS-12

< FUNCTION DIAGNOSIS >

SIGNAL BUFFER SYSTEM

SIGNAL BUFFER SYSTEM

System Diagram

INFOID:0000000003935251

System Description

INFOID:0000000003935252

OUTLINE

BCM has the signal transmission function that outputs/transmits each input/received signal to each unit.

Signal transmission function list

ALMIA0263GB

Signal name

Input

Output

Description

Oil pressure switch signal

IPDM E/R (CAN)

Combination meter (CAN)

Transmits the received oil pres-
sure switch signal via CAN 
communication.

2009 Pathfinder