Page 825 of 5121
BCS-8
< FUNCTION DIAGNOSIS >
COMBINATION SWITCH READING SYSTEM
COMBINATION SWITCH READING SYSTEM
System DiagramINFOID:0000000003809586
System DescriptionINFOID:0000000003809587
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
Combination switch circuit
Combination switch INPUT-OUTPUT system list
JPMIA0734GB
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 — — HEADLAMP 2 HI BEAM
JPMIA0735GB
Page 826 of 5121

BCS
COMBINATION SWITCH READING SYSTEM
BCS-9
< FUNCTION DIAGNOSIS >
C
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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.
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
INPUT 4 — INT VOLUME 3 AUTO LIGHT — TAIL LAMP
INPUT 5 INT VOLUME 2 — RR FOG FR FOG —System OUTPUT 1 OUTPUT 2 OUTPUT 3 OUTPUT 4 OUTPUT 5
JPMIA0067GB
JPMIA0068GB
Page 827 of 5121

BCS-10
< FUNCTION DIAGNOSIS >
COMBINATION SWITCH READING SYSTEM
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 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.
JPMIA0736GB
JPMIA0737GB
Page 828 of 5121
BCS
COMBINATION SWITCH READING SYSTEM
BCS-11
< FUNCTION DIAGNOSIS >
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Component Parts LocationINFOID:0000000003809588
Wiper intermittent
dial positionIntermittent
operation delay
intervalINT VOLUME switch ON/OFF status
INT VOLUME 1 switch INT VOLUME 2 switch INT VOLUME 3 switch
1
Short
↑
↓
LongON ON ON
2ONONOFF
3ONOFFOFF
4 OFF OFF OFF
5OFFOFFON
6OFFONON
7OFFONOFF
1. Combination switch 2. BCM
A. Behind of combination meter
JPMIA1041ZZ
Page 829 of 5121

BCS-12
< FUNCTION DIAGNOSIS >
SIGNAL BUFFER SYSTEM
SIGNAL BUFFER SYSTEM
System DiagramINFOID:0000000003809589
System DescriptionINFOID:0000000003809590
OUTLINE
BCM has the signal transmission function that outputs/transmits each input/received signal to each unit.
Signal transmission function list
JPMIA1045GB
Signal name Input Output Description
Ignition switch ON signal
Ignition switch signalPush-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 (CAN)
IPDM E/R (CAN)
Driver seat control unit (CAN)
AV control unit (CAN)Inputs the door switch signal
and transmits it via CAN com-
munication.
Trunk switch signal Trunk room lamp switch Combination meter (CAN)
AV control unit (CAN)Inputs the trunk room lamp
switch signal and transmits the
trunk switch signal via CAN
communication.
Oil pressure switch signal IPDM E/R (CAN) Combination meter (CAN)Transmits the received oil pres-
sure switch signal via CAN
communication.
Stop lamp switch signal Stop lamp switch TCM (CAN)Inputs the stop lamp switch sig-
nal and transmits it via CAN
communication.
Page 830 of 5121

BCS
POWER CONSUMPTION CONTROL SYSTEM
BCS-13
< FUNCTION DIAGNOSIS >
C
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POWER CONSUMPTION CONTROL SYSTEM
System DiagramINFOID:0000000003809591
System DescriptionINFOID:0000000003809592
OUTLINE
BCM incorporates a power saving control function that reduces the power consumption according to the
vehicle status.
BCM switches the status (control mode) by itself with the power saving control function. It performs the sleep
request to each unit (IPDM E/R, combination meter, driver seat control unit and automatic back door control
unit) that operates with the ignition switch OFF.
Normal mode (wake-up)- CAN communication is normally performed with other units
- Each control with BCM is operating properly
CAN communication sleep mode (CAN sleep)- CAN transmission is stopped
- Control with BCM only is operating
Low power consumption mode (BCM sleep)- Low power consumption control is active
- CAN transmission is stopped
LOW POWER CONSUMPTION CONTROL WITH BCM
BCM reduces the power consumption with the following operation in the low power consumption mode.
The reading interval of the each switches changes from 10 ms interval to 60 ms interval.
Sleep mode activation
BCM receives the sleep-ready signal (ready) from IPDM E/R and combination meter via CAN communica-
tion.
BCM transmits the sleep wake up signal (sleep) to each unit when all of the CAN sleep conditions are ful-
filled.
Each unit stops the transmission of CAN communication with the sleep wake up signal. BCM is in CAN com-
munication sleep mode.
BCM is in the low power consumption mode and perform the low power consumption control when all of the
BCM sleep conditions are fulfilled with CAN sleep condition.
JPMIA1046GB
Page 831 of 5121

BCS-14
< FUNCTION DIAGNOSIS >
POWER CONSUMPTION CONTROL SYSTEM
Sleep condition
Wake-up operation
BCM changes from the low power consumption mode to the CAN communication sleep mode when the any
of the BCM wake-up conditions is fulfilled. Only the control with BCM is activated.
BCM transmits the sleep wake up signal (wake up) to each unit when any of the CAN wake-up conditions is
fulfilled. It changes from the low power consumption mode or the CAN communication sleep mode to the
normal mode.
Each unit starts the transmission of CAN communication with the sleep wake up signal. In addition, the com-
bination meter transmits the wake up signal to BCM via CAN communication to report the CAN communica-
tion start.
Wake-up condition
CAN sleep condition BCM sleep condition
Receiving the sleep-ready signal (ready) from all units
Ignition switch: OFF
Vehicle security system: Not operation
Warning chime: Not operation
Intelligent Key system buzzer: Not operation
Trunk room lamp switch status: No change
Stop lamp switch: OFF
Key slot (card switch) status: No change
Turn signal indicator lamp: Not operation
Exterior lamp: OFF
Door lock status: No change
CONSULT-III communication status: Not communication
Meter display signal: Non-transmission
Door switch status: No change
Rear window defogger: OFF Interior room lamp battery saver: Time out
Push-button ignition switch illumination: OFF
Nissan Vehicle Immobilizer System (NVIS) - NATS: Not opera-
tion
Remote keyless entry receiver communication status: No com-
munication
ACC indicator lamp: Not operation
ON indicator lamp: Not operation
BCM wake-up condition CAN wake-up condition
Trunk lid opener switch: OFF → ON
Remote keyless entry receiver: Receiving
Door lock and unlock switch:
NEUTRAL → LOCK, NEUTRAL → UNLOCK
Front door lock assembly driver side (unlock sensor):
OFF → ON, ON → OFF Receiving the sleep-ready signal (Not-ready) from any units
Key slot (key switch): OFF → ON, ON → OFF
Push-button ignition switch (push switch): OFF→ ON
Hazard switch: OFF → ON
PASSING switch: OFF → ON, ON → OFF
TAIL LAMP switch: OFF → ON
Driver door switch: OFF → ON, ON → OFF
Passenger door switch: OFF → ON, ON → OFF
Rear RH door switch: OFF → ON, ON → OFF
Rear LH door switch: OFF → ON, ON → OFF
Trunk room lamp switch: OFF → ON, ON → OFF
Driver door request switch: OFF → ON
Passenger door request switch: OFF → ON
Trunk lid request switch: OFF → ON
Stop lamp switch: ON
Page 832 of 5121
BCS
POWER CONSUMPTION CONTROL SYSTEM
BCS-15
< FUNCTION DIAGNOSIS >
C
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Component Parts LocationINFOID:0000000003809593
1. Combination meter 2. IPDM E/R 3. BCM
4. Driver seat control unit
A. Engine room (LH) B. Behind of combination meter C. Backside of the seat cushion (driver
seat)
JPMIA1042ZZ