Infiniti FX35, FX50 (S51). Manual - part 207

BCS

COMBINATION SWITCH READING SYSTEM

BCS-9

< SYSTEM DESCRIPTION >

C

D

E

F

G

H

I

J

K

L

B

A

O

P

N

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 60 ms interval when BCM is controlled at low power con-
sumption 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.

- 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.

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/

AUTO

PASSING

HEADLAMP 1

INPUT 3

WIP VOLUME 1

—

—

HEADLAMP 2

HI BEAM

INPUT 4

—

WIP VOLUME 3

AUTO LIGHT

—

TAIL LAMP

INPUT 5

WIP VOLUME 2

—

—

FR FOG

—

JPMIA0067GB

JPMIA0068GB

BCS-10

< SYSTEM DESCRIPTION >

COMBINATION SWITCH READING SYSTEM

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

• 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 VOLUME DIAL POSITION

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

JMMIA0294GB

JMMIA0295GB

Wiper volume dial position

Switch status  

WIP VOLUME 1

WIP VOLUME 2

WIP VOLUME 3

1

ON

ON

ON

2

ON

ON

OFF

BCS

COMBINATION SWITCH READING SYSTEM

BCS-11

< SYSTEM DESCRIPTION >

C

D

E

F

G

H

I

J

K

L

B

A

O

P

N

NOTE:

For details of wiper volume dial position, refer to 

WW-5, "WITH RAIN SENSOR : System Description"

 (with rain sensor), 

WW-9, "WITH-

OUT RAIN SENSOR : System Description"

 (without rain sensor).

3

ON

OFF

OFF

4

OFF

OFF

OFF

5

OFF

OFF

ON

6

OFF

ON

ON

7

OFF

ON

OFF

Wiper volume dial position

Switch status  

WIP VOLUME 1

WIP VOLUME 2

WIP VOLUME 3

BCS-12

< SYSTEM DESCRIPTION >

SIGNAL BUFFER SYSTEM

SIGNAL BUFFER SYSTEM

System Diagram

INFOID:0000000005612131

System Description

INFOID:0000000005612132

OUTLINE

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

Signal transmission function list

JMMIA0247GB

Signal name

Input

Output

Description

• Ignition switch ON signal
• Ignition switch signal

Push-button ignition switch 
(Push switch)

• IPDM E/R (CAN)
• Driver seat control unit (CAN)

Inputs the push-button ignition 
switch (push switch) signal and 
transmits the ignition switch sta-
tus judged with BCM via CAN 
communication.

Door switch signal

Any door switch

• Combination meter (through 

unified meter and A/C amp.) 
(CAN)

• IPDM E/R (CAN)
• Driver seat control unit (CAN)

Inputs the door switch signal 
and transmits it via CAN com-
munication.

Oil pressure switch signal

IPDM E/R (CAN)

Combination meter (through 
unified meter and A/C amp.) 
(CAN)

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

Stop lamp switch signal

• Stop lamp switch
• ICC brake hold relay (With 

ICC)

TCM (CAN)

Inputs the stop lamp switch 1 
signal and stop lamp switch 2 
signal, and transmits it via CAN 
communication.