Page 145 of 5883

BCS-10
< FUNCTION DIAGNOSIS >
COMBINATION SWITCH READING 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 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.
- 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 RR WIPER INT INT VOLUME 3 AUTO LIGHT — TAIL LAMP
INPUT 5 INT VOLUME 2 RR WIPER RR FOG FR FOG —System OUTPUT 1 OUTPUT 2 OUTPUT 3 OUTPUT 4 OUTPUT 5
JPMIA0067GB
JPMIA0068GB
Page 146 of 5883

BCS
COMBINATION SWITCH READING SYSTEM
BCS-11
< FUNCTION DIAGNOSIS >
C
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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.
JPMIA0122GB
JPMIA0123GB
Page 147 of 5883
BCS-12
< FUNCTION DIAGNOSIS >
COMBINATION SWITCH READING SYSTEM
Component Parts Location
INFOID:0000000001451457
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
6 OFF ON ON
7 OFF ON OFF
1. BCM M18, M19, M20 (view with
glove box removed)2. Combination switch (light and turn
signal switch) M283. Combination switch (wiper and
washer switch) M28
ALMIA0186ZZ
Page 148 of 5883
BCS
SIGNAL BUFFER SYSTEM
BCS-13
< FUNCTION DIAGNOSIS >
C
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SIGNAL BUFFER SYSTEM
System DiagramINFOID:0000000001451458
System DescriptionINFOID:0000000001451459
OUTLINE
BCM has the signal transmission function that outputs/transmits each input/received signal to each unit.
Signal transmission function list
JPMIA0124GB
Signal name Input Output Description
Door switch signal Any door switch Combination meter (CAN)
IPDM E/R (CAN)
Intelligent Key unit (CAN)
NAVI control unit (CAN)Inputs the door switch signal
and transmits it via CAN com-
munication.
Stop lamp switch signal Stop lamp switchTCM (CAN)
ECM (CAN)Inputs the stop lamp switch sig-
nal and transmits the stop lamp
switch signal via CAN commu-
nication.
Oil pressure switch signal IPDM E/R (CAN) Combination meter (CAN)Transmits the received oil pres-
sure switch signal via CAN
communication.
Page 149 of 5883

BCS-14
< FUNCTION DIAGNOSIS >
POWER CONSUMPTION CONTROL SYSTEM
POWER CONSUMPTION CONTROL SYSTEM
System DiagramINFOID:0000000001451460
System DescriptionINFOID:0000000001451461
OUTLINE
BCM incorporates a power consumption 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 and Intelligent Key unit (with Intelligent Key)] that oper-
ates 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 20 ms interval.
Sleep mode activation
BCM receives the sleep-ready signal (ready) from IPDM E/R, combination meter and Intelligent Key unit
(with Intelligent Key) via CAN communication.
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.
JPMIA0125GB
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BCS
POWER CONSUMPTION CONTROL SYSTEM
BCS-15
< FUNCTION DIAGNOSIS >
C
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Sleep condition
Wake-up operation
BCM transmits sleep wake up signal (wake up) to each unit when any condition listed below is established,
and then goes into normal mode from low power consumption mode.
Each unit starts transmissions with CAN communication by receiving sleep wake up signals. Each unit trans-
mits wake up signals to BCM with CAN communication to convey the start of CAN communication.
Wake-up condition
Component Parts LocationINFOID:0000000001451462
CAN sleep condition BCM sleep condition
Receiving the sleep-ready signal (ready) from all units
Ignition switch: OFF
Vehicle security system alarm: No operation
Warning lamp: No operation
Warning chime: No operation
Stop lamp switch: OFF
Key switch status: No change for 2 seconds
Hazard warning lamp: No operation
Exterior lamp: OFF
Door lock status: No change for 2 seconds
CONSULT-III communication status: No communication
Door switch status: No change for 2 secondsThe controls only BCM are completed.
(Interior room lamp battery saver: Time out etc.)
BCM wake-up condition
Ignition switch: OFF → ACC or ON
Stop lamp switch: ON (Depress brake pedal)
Any door switch: OFF → ON
Lighting switch: OFF → 1ST or PASS
Hazard switch: OFF → ON
Back door opener switch OFF → ON
Remote keyless entry receiver: Receiving (with remote keyless entry)
Intelligent Key unit: Receiving (with Intelligent Key)
1. IPDM E/R E46 2. BCM M18, M19, M20 (view with
glove box removed)3. Intelligent Key unit M52 (with Intelli-
gent Key) (view with glove box re-
moved)
4. Combination meter M24
ALMIA0187ZZ
Page 151 of 5883

BCS-16
< FUNCTION DIAGNOSIS >
DIAGNOSIS SYSTEM (BCM)
DIAGNOSIS SYSTEM (BCM)
COMMON ITEM
COMMON ITEM : CONSULT-III Function (BCM - COMMON ITEM)INFOID:0000000001451463
APPLICATION ITEM
CONSULT-III performs the following functions via CAN communication with BCM.
SYSTEM APPLICATION
BCM can perform the following functions for each system.
NOTE:
It can perform the diagnosis modes except the following for all sub system selection items.
1: With remote keyless entry system
2: With Intelligent Key
BCM
Diagnosis mode Function Description
WORK SUPPORT Changes the setting for each system function.
SELF-DIAG RESULTS Displays the diagnosis results judged by BCM. Refer to BCS-54, "
DTCIndex".
CAN DIAG SUPPORT MNTR Monitors the reception status of CAN communication viewed from BCM.
DATA MONITOR The BCM input/output signals are displayed.
ACTIVE TEST The signals used to activate each device are forcibly supplied from BCM.
ECU IDENTIFICATION The BCM part number is displayed.
CONFIGURATION Enables to read and save the vehicle specification.
Enables to write the vehicle specification when replacing BCM.
System Sub system selection itemDiagnosis mode
WORK SUPPORT DATA MONITOR ACTIVE TEST
BCM BCM×
Door lock DOOR LOCK×××
Rear window defogger REAR DEFOGGER××
Warning chime BUZZER××
Interior room lamp timer INT LAMP×××
Remote keyless entry system
1MULTI REMOTE ENT×××
Exterior lamp HEAD LAMP×××
Wiper and washer WIPER×××
Turn signal and hazard warning lamps FLASHER××
Air conditioner AIR CONDITONER×
Intelligent Key system
2INTELLIGENT KEY×
Combination switch COMB SW×
Immobilizer IMMU××
Interior room lamp battery saver BATTERY SAVER×××
Trunk open (sedan)/Back door open
(hatch back)DOOR LOCK××
Vehicle security system THEFT ALM×××
Signal buffer system SIGNAL BUFFER××
PTC heater system PTC HEATER××
Page 152 of 5883

BCS
DIAGNOSIS SYSTEM (BCM)
BCS-17
< FUNCTION DIAGNOSIS >
C
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BCM : CONSULT-III Function (BCM - BCM)INFOID:0000000001451464
WORK SUPPORT
DOOR LOCK
DOOR LOCK : CONSULT-III Function (BCM - DOOR LOCK)INFOID:0000000001451465
WORK SUPPORT
DATA MONITOR
1: With Intelligent Key
2: With remote keyless entry system
ACTIVE TEST
Item Description
RESET SETTING VALUE Return a value set with WORK SUPPORT of each system to a default value in factory shipment.
Work Item Description
SECURITY DOOR LOCK SETAnti hijack function mode can be changed in this mode.
ON: Anti hijack mode is active.
OFF: Anti hijack mode is inactive.
AUTO LOCK SETAuto door lock time can be changed in this mode.
MODE 1: 1 minute
MODE 2: 2 minutes
MODE 3: 3 minutes
MODE 4: 4 minutes
MODE 5: 5 minutes
Monitor Item
[Unit}Description
IGN ON SW [ON/OFF] Indicates condition of ignition switch in ON position.
PUSH SW
1 [ON/OFF]Indicates condition of ignition knob switch.
KEY SW
2 [ON/OFF]Indicates condition of key switch.
CDL LOCK SW [ON/OFF] Indicates condition of door lock and unlock switch.
CDL UNLOCK SW [ON/OFF] Indicates condition of door lock and unlock switch.
DOOR SW-DR [ON/OFF] Indicates condition of front door switch (driver side).
DOOR SW-AS [ON/OFF] Indicates condition of front door switch (passenger side).
DOOR SW-RR [ON/OFF] Indicates condition of rear door switch RH.
DOOR SW-RL [ON/OFF] Indicates condition of rear door switch LH.
TRNK OPNR SW [ON/OFF] Indicates condition of back door switch.
BACK DOOR SW [ON/OFF] Indicates condition of back door switch.
KEYLESS LOCK
2 [ON/OFF]Indicates condition of lock signal from key fob.
KEYLESS UNLOCK
2 [ON/OFF]Indicates condition of unlock signal from key fob.
I-KEY LOCK
1 [ON/OFF]Indicates condition of lock signal from Intelligent Key.
I-KEY UNLOCK
1 [ON/OFF]Indicates condition of unlock signal from Intelligent Key.
Test item Description
DOOR LOCKThis test is able to check door lock operation [ALL LOCK/ALL UNLOCK/DR UNLOCK/
OTHER UNLOCK].
SUPER LOCK
*This test is able to check super lock operation [LOCK (SET)/UNLOCK (RELEASE)].