Infiniti QX56 (Z62). Manual - part 98

 

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Infiniti QX56 (Z62). Manual - part 98

 

 

BCS-6

< SYSTEM DESCRIPTION >

SYSTEM

SYSTEM

BODY CONTROL SYSTEM

BODY CONTROL SYSTEM : System Description

INFOID:0000000006274789

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 saving con-
trol 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

Reference

Combination switch reading system

BCS-7, "COMBINATION SWITCH READING SYSTEM : System 
Diagram"

Signal buffer system

BCS-10, "SIGNAL BUFFER SYSTEM : System Diagram"

Power consumption control system

BCS-11, "POWER CONSUMPTION CONTROL SYSTEM : Sys-
tem Diagram"

Auto light system

EXL-11, "AUTO LIGHT SYSTEM : System Diagram"

Turn signal and hazard warning lamp system

EXL-18, "TURN SIGNAL AND HAZARD WARNING LAMP SYS-
TEM : System Diagram"

Headlamp system

EXL-10, "HEADLAMP SYSTEM : System Diagram"

Daytime running light system

EXL-14, "DAYTIME RUNNING LIGHT SYSTEM : System Dia-
gram"

Parking, license plate, side maker and tail lamps system

EXL-18, "PARKING, LICENSE PLATE, SIDE MARKER AND 
TAIL LAMP SYSTEM : System Diagram"

Front fog lamp system

EXL-20, "FRONT FOG LAMP SYSTEM : System Diagram"

Exterior lamp battery saver system

EXL-20, "EXTERIOR LAMP BATTERY SAVER SYSTEM : Sys-
tem Diagram"

Interior room lamp control system

INL-6, "INTERIOR ROOM LAMP CONTROL SYSTEM : System 
Diagram"

Interior room lamp battery saver system

INL-9, "INTERIOR ROOM LAMP BATTERY SAVER SYSTEM : 
System Diagram"

Front wiper and washer system

WW-7, "FRONT WIPER AND WASHER SYSTEM : System Dia-
gram"

Rear wiper and washer system

WW-10, "REAR WIPER AND WASHER SYSTEM : System Dia-
gram"

Headlamp washer system

WW-13, "HEADLAMP WASHER SYSTEM : System Diagram"

Warning chime system

WCS-6, "WARNING CHIME SYSTEM : System Diagram"

Power door lock system

DLK-16, "System Diagram"

Infiniti Vehicle immobilizer System (IVIS)

SEC-15, "INFINITI VEHICLE IMMOBILIZER SYSTEM-NATS : 
System Diagram"

Vehicle security system

Theft warning alarm

SEC-17, "VEHICLE SECURITY SYSTEM : System Diagram"

Panic alarm

Rear window defogger system

DEF-6, "System Diagram"

Intelligent Key system/engine start system

DLK-18, "INTELLIGENT KEY SYSTEM : System Diagram"

Power window system

PWC-8, "System Diagram"

Retained accessory power (RAP) system

PWC-8, "System Description"

BCS

SYSTEM

BCS-7

< SYSTEM DESCRIPTION >

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COMBINATION SWITCH READING SYSTEM

COMBINATION SWITCH READING SYSTEM : System Diagram

INFOID:0000000006274790

NOTE:
*: TAIL LAMP switch links lighting switch 1ST and 2ND positions.

COMBINATION SWITCH READING SYSTEM : System Description

INFOID:0000000006274791

OUTLINE

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

status of each switch.

• BCM has 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

Combination switch circuit

NOTE:
*: TAIL LAMP switch links lighting switch 1ST and 2ND positions.

Combination switch INPUT-OUTPUT system list

JMMIA0499GB

JMMIA0500GB

System

INPUT 1

INPUT 2

INPUT 3

INPUT 4

INPUT 5

OUTPUT 1

FR WASHER

FR WIPER LOW

TURN LH

TURN RH

OUTPUT 2

FR WIPER HI

FR WIPER AUTO

PASSING

HEADLAMP 1

BCS-8

< SYSTEM DESCRIPTION >

SYSTEM

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 60 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.
- It operates the transistor on OUTPUT side in the following order: OUTPUT 1 

 2 

 3 

 4 

 5, and outputs

voltage waveform.

- The voltage waveform of OUTPUT corresponding to the formed circuit is input into the interface on INPUT

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 (TAIL LAMP switch) is turned ON

OUTPUT 3

WIP VOLUME 1

RR WASHER

HEADLAMP 2

HI BEAM

OUTPUT 4

RR WIPER INT

WIP VOLUME 3

AUTO LIGHT

TAIL LAMP

OUTPUT 5

WIP VOLUME 2

RR WIPER ON

RR FOG

FR FOG

System

INPUT 1

INPUT 2

INPUT 3

INPUT 4

INPUT 5

JPMIA0609GB

JMMIA0326GB

BCS

SYSTEM

BCS-9

< SYSTEM DESCRIPTION >

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• The circuit between OUTPUT 4 and INPUT 5 is formed when the TAIL LAMP switch is turned ON.

• BCM detects the combination switch status signal “5D” when the signal of OUTPUT 4 is input to INPUT 5.
• BCM judges that the TAIL LAMP switch is ON when the signal “5D” is detected.

Example 2: When some switches (TURN RH switch, TAIL LAMP switch) are turned ON

• The circuits between OUTPUT 1 and INPUT 5 and between OUTPUT 4 and INPUT 5 are formed when the

TURN RH switch and TAIL LAMP switch are turned ON.

• BCM detects the combination switch status signal “5AD” when the signals of OUTPUT 1 and OUTPUT 4 are

input to INPUT 5.

• BCM judges that the TURN RH switch and TAIL LAMP switch are ON when the signal “5AD” is detected.

WIPER VOLUME DIAL POSITION

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

JMMIA0501GB

JMMIA0502GB

Wiper volume

dial position

Switch status

WIP VOLUME 1

WIP VOLUME 2

WIP VOLUME 3

1

ON

ON

ON

2

ON

ON

OFF

3

ON

OFF

OFF

4

OFF

OFF

OFF

5

OFF

OFF

ON

 

 

 

 

 

 

 

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