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 components. It also has the signal transmission function as the passed point of signal and the power consumption control function that reduces the power consumption with the ignition switch OFF.
- BCM is equipped with the diagnosis function that performs the diagnosis with SDT and various settings.
BCM control function list
| System | Refer to |
|---|---|
| Combination switch reading system | [ COMBINATION SWITCH READING SYSTEM: SYSTEM DIAGRAM ] |
| Signal buffer system | [ SIGNAL BUFFER SYSTEM: SYSTEM DIAGRAM ] |
| Power consumption control system | [ POWER CONSUMPTION CONTROL SYSTEM: SYSTEM DIAGRAM ] |
| Turn signal and hazard warning lamp system | [ TURN SIGNAL AND HAZARD WARNING LAMPS: SYSTEM DIAGRAM ] |
| Headlamp system | [ HEADLAMP: SYSTEM DIAGRAM ] |
| Front fog lamp system (if equipped) | [ FRONT FOG LAMP: SYSTEM DIAGRAM ] |
| Daytime running light system (Canada only) | [ DAYTIME RUNNING LIGHT SYSTEM: SYSTEM DIAGRAM ] |
| Interior room lamp control system | [ INTERIOR ROOM LAMP CONTROL SYSTEM: SYSTEM DIAGRAM [WITH POWER DOOR LOCKS] ] |
| Interior room lamp battery saver system | [ SDT FUNCTION (BCM - INT LAMP) ] |
| Front wiper and washer system | [ FRONT WIPER AND WASHER SYSTEM: SYSTEM DIAGRAM ] |
| Warning chime system | [ WARNING CHIME SYSTEM: SYSTEM DIAGRAM ] |
| Door lock system (if equipped) | [ DOOR LOCK FUNCTION: SYSTEM DIAGRAM [DOOR LOCK AND UNLOCK SWITCH] ] |
| Immobilizer system (if equipped) | [ IMMOBILIZER SYSTEM: SYSTEM DIAGRAM ] |
| Vehicle security system (if equipped) | [ VEHICLE SECURITY SYSTEM: SYSTEM DIAGRAM ] |
| Remote keyless entry system (if equipped) | [ DOOR LOCK FUNCTION: SYSTEM DIAGRAM [REMOTE KEYLESS ENTRY] ] |
| Power window system (if equipped) | [ POWER WINDOW SYSTEM: SYSTEM DIAGRAM ] |
| RAP (retained accessory power) system | [ SDT FUNCTION (BCM - RETAINED PWR) ] |
| TPMS (tire pressure monitoring system) | [ TPMS: SYSTEM DIAGRAM ] |
BCM CONTROL FUNCTION CHART
BCM has the signal transmission function that outputs/transmits each input/received signal to each unit.
Signal transmission function list
| Signal name | Input | Output | Description |
|---|---|---|---|
| Oil pressure switch signal | IPDM E/R (CAN) | Combination meter (CAN) | Transmits the received oil pressure switch signal via CAN communication. |
SIGNAL TRANSMISSION FUNCTION CHART
- 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 and combination meter) 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 20 ms interval.
Sleep mode activation
- BCM receives the sleep-ready signal (ready) from IPDM E/R and combination meter via CAN communication.
- BCM transmits the sleep wake up signal (sleep) to each unit when all of the CAN sleep conditions are fulfilled.
- Each unit stops the transmission of CAN communication with the sleep wake up signal. BCM is in CAN communication 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.
Sleep condition
| 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 SDT communication status: No communication Door switch status: No change for 2 seconds | The controls only BCM are completed. (Interior room lamp battery saver: Time out etc.) |
SLEEP CONDITION REFERENCE
Wake-up condition
| 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 Remote keyless entry receiver: Receiving (with remote keyless entry) |
WAKE-UP CONDITION REFERENCE
Combination Switch Reading System: System Diagram
Refer to [ COMBINATION SWITCH READING SYSTEM: SYSTEM DIAGRAM ].
Scheme 80
Scheme 81
Scheme 82
- BCM M18, M19, M20 (view with lower instrument panel LH removed)
Special Repair Requirement
| Step | Action | YES | NO |
|---|---|---|---|
| 1 | SAVING VEHICLE SPECIFICATION Perform "READ CONFIGURATION" with SDT to save or print current vehicle specification. | GO TO 2 | |
| 2 | Replace BCM Replace BCM. Refer to [ BCM (BODY CONTROL MODULE): REMOVAL AND INSTALLATION ]. | GO TO 3 | |
| 3 | WRITING VEHICLE SPECIFICATION Perform "WRITE CONFIGURATION - Config file" or "WRITE CONFIGURATION - Manual selection" with SDT to write vehicle specification. Refer to [ BODY CONTROL SYSTEM: CONFIGURATION ]. | GO TO 4 | |
| 4 | INITIALIZE BCM (IMMOBILIZER SYSTEM) Perform BCM initialization. Refer to . | Work End. |
DIAGNOSIS PROCEDURE
| Step | Action | YES | NO |
|---|---|---|---|
| 1 | WRITING VEHICLE SPECIFICATION Perform "WRITE CONFIGURATION" with SDT. | GO TO 2 | GO TO 3 |
| 2 | PERFORM "WRITE CONFIGURATION - Config file" Perform "WRITE CONFIGURATION - Config file" with SDT. | Work End. | |
| 3 | PERFORM "WRITE CONFIGURATION - Manual selection" For "WRITE CONFIGURATION - Manual selection", using the following chart, identify the correct model and configuration list. Confirm and/or change setting value for each item according to the configuration list. Depending on SDT software version being used, some or all of the write configuration items shown in the following configuration lists may be displayed. If an item does not display on the SDT "WRITE CONFIGURATION - Manual selection" screen, then it is an auto setting item and it cannot be manually set or changed. | Work End. |
DIAGNOSIS PROCEDURE
SDT Function (BCM - COMMON ITEM)
Refer to [ SDT FUNCTION (BCM - COMMON ITEM) ].
Utility
| Item | Description |
|---|---|
| RESET SETTING VALUE | Return a value set with Utility of each system to a default value in factory shipment. |
ITEM DESCRIPTION
SDT Function (BCM - DOOR LOCK)
Refer to [ SDT FUNCTION (BCM - DOOR LOCK) ].
SDT Function (BCM - REAR DEFOGGER)
Refer to SDT FUNCTION (BCM - REAR DEFOGGER)
SDT Function (BCM - BUZZER)
Refer to [ SDT FUNCTION (BCM - BUZZER) ].
SDT Function (BCM - INT LAMP)
Refer to [ SDT FUNCTION (BCM - INT LAMP) [WITH POWER DOOR LOCKS] ].
SDT Function (BCM - MULTIREMOTE ENT)
Refer to [ SDT FUNCTION (BCM - MULTIREMOTE ENT) ].
SDT Function (BCM - HEAD LAMP)
Refer to [ SDT FUNCTION (BCM - HEAD LAMP) ].
SDT Function (BCM - WIPER)
Refer to [ SDT FUNCTION (BCM - WIPER) ].
SDT Function (BCM - FLASHER)
Refer to [ SDT FUNCTION (BCM - FLASHER) ].
SDT Function (BCM - AIR CONDITIONER)
Refer to [ SDT FUNCTION (BCM - AIR CONDITIONER) ].
SDT Function (BCM - COMB SW)
Refer to [ SDT FUNCTION (BCM - COMB SW) ].
Data List
| Monitor Item [Unit] | Description |
|---|---|
| IGN ON SW [ON/OFF] | Indicates condition of ignition switch in ON position. |
DATA LIST REFERENCE
SDT Function (BCM - BATTERY SAVER)
Refer to [ SDT FUNCTION (BCM - BATTERY SAVER) ].
| Monitor Item [Unit] | Contents |
|---|---|
| IGN ON SW [ON/OFF] | Indicates condition of ignition switch in ON position |
| I-KEY TRUNK [ON/OFF] | NOTE: This is displayed even when it is not equipped |
| TRUNK OPNR SW [ON/OFF] | NOTE: This is displayed even when it is not equipped |
| VEHICLE SPEED [ON/OFF] | Indicates condition of vehicle speed signal from combination meter |
| NOTE |
|---|
| This is displayed even when it is not equipped |
| NOTE |
|---|
| This is displayed even when it is not equipped |
DATA LIST REFERENCE
SDT Function (BCM - RETAINED PWR)
Refer to [ SDT FUNCTION (BCM - RETAINED PWR) ].
| Monitor Item [Unit] | Description |
|---|---|
| OIL PRESS SW [ON/OFF] | Displays the status of oil pressure switch received from IPDM E/R via CAN communication. |
DATA LIST REFERENCE
With SDT
- Touch "DTC check" display to show malfunction experienced since the last erasing operation. Refer to [ «DTC INDEX: BCM»(ref-375707-S33883633622010102800000) ].
Without SDT
To start the DTC check mode, ground terminal of the tire pressure warning check connector. The malfunction location is indicated by the warning lamp flashing.
Scheme 83
Note. When the low tire warning lamp flashes 5 Hz and continues repeating it, the system is normal.
| Flickering pattern | Items | Diagnostic items detected when... | Check item |
|---|---|---|---|
| 15 | Tire pressure value (Front LH) | Front LH tire pressure drops to 181 kPa (1.8 kg/cm, 25.25 psi) or less. | |
| 16 | Tire pressure value (Front RH) | Front RH tire pressure drops to 181 kPa (1.8 kg/cm, 25.25 psi) or less. | |
| 17 | Tire pressure value (Rear RH) | Rear RH tire pressure drops to 181 kPa (1.8 kg/cm, 25.25 psi) or less. | |
| 18 | Tire pressure value (Rear LH) | Rear LH tire pressure drops to 181 kPa (1.8 kg/cm, 25.25 psi) or less. | |
| 21 | Transmitter no data (Front LH) | Data from front LH transmitter can not be received. | |
| 22 | Transmitter no data (Front RH) | Data from front RH transmitter can not be received. | |
| 23 | Transmitter no data (Rear RH) | Data from Rear RH transmitter can not be received. | |
| 24 | Transmitter no data (Rear LH) | Data from Rear LH transmitter can not be received. | |
| 31 | Transmitter checksum error (Front LH) | Checksum data from front LH transmitter is malfunctioning. | |
| 32 | Transmitter checksum error (Front RH) | Checksum data from front RH transmitter is malfunctioning. | |
| 33 | Transmitter checksum error (Rear RH) | Checksum data from rear RH transmitter is malfunctioning. | |
| 34 | Transmitter checksum error (Rear LH) | Checksum data from rear RH transmitter is malfunctioning. | |
| 35 | Transmitter pressure data error (Front LH) | Air pressure data from front LH transmitter is malfunction. | |
| 36 | Transmitter pressure data error (Front RH) | Air pressure data from front RH transmitter is malfunction. | |
| 37 | Transmitter pressure data error (Rear RH) | Air pressure data from rear RH transmitter is malfunction. | |
| 38 | Transmitter pressure data error (Rear LH) | Air pressure data from rear LH transmitter is malfunction. | |
| 41 | Transmitter function code error (Front LH) | Function code data from front LH transmitter is malfunction. | |
| 42 | Transmitter function code error (Front RH) | Function code data from front RH transmitter is malfunction. | |
| 43 | Transmitter function code error (Rear RH) | Function code data from rear RH transmitter is malfunction. | |
| 44 | Transmitter function code error (Rear LH) | Function code data from rear LH transmitter is malfunction. | |
| 45 | Transmitter battery voltage low (Front LH) | Battery voltage of front LH transmitter drops. | |
| 46 | Transmitter battery voltage low (Front RH) | Battery voltage of front RH transmitter drops. | |
| 47 | Transmitter battery voltage low (Rear RH) | Battery voltage of rear RH transmitter drops. | |
| 48 | Transmitter battery voltage low (Rear LH) | Battery voltage of rear LH transmitter drops. | |
| 52 | Vehicle speed signal error | Speed signal is not detected. | |
| No flickering | Tire pressure warning check switch | Tire pressure warning switch circuit is open. |
LOW TIRE WARNING LAMP FLICKERING PATTERN REFERENCE
- Perform applicable inspection of malfunctioning item and then repair or replace.
- Turn ignition switch "ON" and select "DTC check" mode for "AIR PRESSURE MONITOR" with SDT.
- Touch "Clear" on SDT screen to erase memory.
- In order to make it easier to find the cause of hard-to-duplicate malfunctions, malfunction information is stored into the control unit as necessary during use by the user. This memory is not erased no matter how many times the ignition switch is turned "ON" and "OFF".
- However, this information is erased by turning ignition switch "OFF" after performing self-diagnostic or by erasing the memory using the SDT.
ID Read
The registered ID number is displayed.
ID Regist
Refer to [ ID REGISTRATION PROCEDURE ]
Screen of "Data list" mode is displayed.
Note. When malfunction is detected, SDT performs REAL-TIME DIAGNOSIS. Also, any malfunction detected while in this mode will be displayed at real time.
Display item list
| Monitor | Condition | Specification |
|---|---|---|
| VEHICLE SPEED | Drive vehicle | Vehicle speed (km/h or MPH) |
| AIR PRESS FL AIR PRESS FR AIR PRESS RR AIR PRESS RL | Drive vehicle for a few minutes. or Ignition switch ON and activation tool is transmitting activation signals. | Tire pressure (kPa, kg/cm 2 or Psi) |
| ID REGST FL1 ID REGST FR1 ID REGST RR1 ID REGST RL1 | Ignition switch ON | Registration ID: Green No registration: Red |
| WARNING LAMP | Low tire pressure warning lamp on: ON Low tire pressure warning lamp off: OFF | |
| BUZZER | Buzzer in combination meter on: ON Buzzer in combination meter off: OFF |
DISPLAY ITEM CHART
| Test Item | Description |
|---|---|
| SECURITY ALARM SET | This mode is able to confirm and change security alarm ON-OFF setting. |
| THEFT ALM TRG | The switch which triggered vehicle security alarm is recorded. This mode is able to confirm and erase the record of vehicle security alarm. The trigger data can be erased by touching "Clear" on SDT screen. |
TEST ITEM DESCRIPTION
| Monitor Item [Unit] | Description |
|---|---|
| IGN ON SW [ON/OFF] | Indicates ignition switch (ON) status judged from IGN signal (ignition power supply) |
| ACC ON SW [ON/OFF] | Indicates ignition switch (ACC) status judged from ACC signal (accessory power supply) |
| KEYLESS LOCK [ON/OFF] | Indicates lock signal status received from remote keyless entry receiver (integrated in the BCM) |
| KEYLESS UNLOCK [ON/OFF] | Indicates unlock signal status received from remote keyless entry receiver (integrated in the BCM) |
| KEYLESS TRUNK [ON/OFF] | NOTE: This is displayed even when it is not equipped |
| KEYLESS PSD R [ON/OFF] | NOTE: This is displayed even when it is not equipped |
| KEYLESS PSD L [ON/OFF] | NOTE: This is displayed even when it is not equipped |
| KEYLESS PBD [ON/OFF] | NOTE: This is displayed even when it is not equipped |
| TRNK OPNR SW [ON/OFF] | NOTE: This is displayed even when it is not equipped |
| TRUNK CYL SW [ON/OFF] | NOTE: This is displayed even when it is not equipped |
| TRNK OPN MNTR [ON/OFF] | NOTE: This is displayed even when it is not equipped |
| DOOR SW-DR [ON/OFF] | Indicates switch status input from front door switch LH |
| DOOR SW-AS [ON/OFF] | Indicates switch status input from front door switch RH |
| DOOR SW-RR [ON/OFF] | Indicates switch status input from rear door switch RH |
| DOOR SW-RL [ON/OFF] | Indicates switch status input from rear door switch LH |
| BACK DOOR SW [ON/OFF] | NOTE: This is displayed even when it is not equipped |
| KEY CYL LK-SW [ON/OFF] | Indicates lock switch status from door key cylinder switch |
| KEY CYL UN-SW [ON/OFF] | Indicates unlock switch status from door key cylinder switch |
| CDL LOCK SW [ON/OFF] | Indicates lock switch status from door lock and unlock switch |
| CDL UNLOCK SW [ON/OFF] | Indicates unlock switch status from door lock and unlock switch |
| HOOD SW [ON/OFF] | NOTE: This is displayed even when it is not equipped |
| NOTE |
|---|
| This is displayed even when it is not equipped |
| NOTE |
|---|
| This is displayed even when it is not equipped |
| NOTE |
|---|
| This is displayed even when it is not equipped |
| NOTE |
|---|
| This is displayed even when it is not equipped |
| NOTE |
|---|
| This is displayed even when it is not equipped |
| NOTE |
|---|
| This is displayed even when it is not equipped |
| NOTE |
|---|
| This is displayed even when it is not equipped |
| NOTE |
|---|
| This is displayed even when it is not equipped |
| NOTE |
|---|
| This is displayed even when it is not equipped |
DATA LIST REFERENCE
Reference Value
Refer to "REFERENCE VALUE" in ECU DIAGNOSIS: BCM (BODY CONTROL MODULE) .
Terminal Layout
Refer to "TERMINAL LAYOUT" in ECU DIAGNOSIS: BCM (BODY CONTROL MODULE) .
Physical Values
Refer to "PHYSICAL VALUES" in ECU DIAGNOSIS: BCM (BODY CONTROL MODULE) .
Fail Safe: BCM
Refer to [ FAIL SAFE: BCM ].
| Step | Action | YES | NO |
|---|---|---|---|
| 1 | SAVING VEHICLE SPECIFICATION Perform "READ CONFIGURATION" with SDT to save or print current vehicle specification. | GO TO 2 | |
| 2 | Replace BCM Replace BCM. Refer to [ BCM (BODY CONTROL MODULE): REMOVAL AND INSTALLATION ]. | GO TO 3 | |
| 3 | WRITING VEHICLE SPECIFICATION Perform "WRITE CONFIGURATION - Config file" or "WRITE CONFIGURATION - Manual selection" with SDT to write vehicle specification. Refer to [ BODY CONTROL SYSTEM: CONFIGURATION ]. | GO TO 4 | |
| 4 | INITIALIZE BCM (IMMOBILIZER SYSTEM) Perform BCM initialization. Refer to [ ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT ]. | Work End. |
DIAGNOSIS PROCEDURE
Power Supply and Ground Circuit Check
Refer to [ POWER SUPPLY AND GROUND CIRCUIT CHECK ].
| Step | Action | YES | NO |
|---|---|---|---|
| 1 | SAVING VEHICLE SPECIFICATION Perform "READ CONFIGURATION" with SDT to save or print current vehicle specification. | GO TO 2 | |
| 2 | Replace BCM Replace BCM. Refer to [ BCM (BODY CONTROL MODULE): REMOVAL AND INSTALLATION ]. | GO TO 3 | |
| 3 | WRITING VEHICLE SPECIFICATION Perform "WRITE CONFIGURATION - Config file" or "WRITE CONFIGURATION - Manual selection" with SDT to write vehicle specification. Refer to [ BODY CONTROL SYSTEM: CONFIGURATION ]. | GO TO 4 | |
| 4 | INITIALIZE BCM (IMMOBILIZER SYSTEM) Perform BCM initialization. Refer to [ ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT ]. | Work End. |
DIAGNOSIS PROCEDURE
| Step | Action | YES | NO |
|---|---|---|---|
| 1 | SAVING VEHICLE SPECIFICATION Perform "READ CONFIGURATION" with SDT to save or print current vehicle specification. | GO TO 2 | |
| 2 | Replace BCM Replace BCM. Refer to [ BCM (BODY CONTROL MODULE): REMOVAL AND INSTALLATION ]. | GO TO 3 | |
| 3 | WRITING VEHICLE SPECIFICATION Perform "WRITE CONFIGURATION - Config file" or "WRITE CONFIGURATION - Manual selection" with SDT to write vehicle specification. Refer to [ BODY CONTROL SYSTEM: CONFIGURATION ]. | GO TO 4 | |
| 4 | INITIALIZE BCM (IMMOBILIZER SYSTEM) Perform BCM initialization. Refer to [ ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT ]. | Work End. |
DIAGNOSIS PROCEDURE
COMBINATION SWITCH MATRIX
Combination switch consists of INPUT circuit and OUTPUT circuit.
Scheme 84
Combination switch INPUT-OUTPUT system list
| 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 | ||
| INPUT 4 | INT VOLUME 3 | AUTO LIGHT | TAIL LAMP | ||
| INPUT 5 | INT VOLUME 2 | FR FOG |
COMBINATION SWITCH INPUT-OUTPUT CHART
Note. Headlamp has a dual system switch.