BODY CONTROL MODULE (BCM) INSPECTION

id094000003900

L.H.D

1. Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.)

2. Remove the scuff plate (driver's side). (See SCUFF PLATE REMOVAL/INSTALLATION.)

3. Remove the front side trim (driver's side). (See FRONT SIDE TRIM REMOVAL/INSTALLATION.)

4. Remove the BCM. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)

5. Connect the BCM connector.

6. Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.)

7. Verify that the voltages of each of the terminals are as indicated in the terminal voltage table (reference). (See Terminal Voltage Table (Reference).)

• If the voltage is not as specified in the terminal voltage table (reference), inspect the parts under Inspection item(s) and related wiring harnesses.

― If the system does not work normally even though the inspection items are normal, identify the malfunctioning location according to the directions in [DIAGNOSTIC SYSTEM] and [SYMPTOM TROUBLESHOOTING] then perform repairs.

R.H.D

1. Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.)

2. Remove the following parts:

(1) Passenger-side scuff plate (See SCUFF PLATE REMOVAL/INSTALLATION.)

(2) Passenger-side front side trim (See FRONT SIDE TRIM REMOVAL/INSTALLATION.)

(3) Passenger-side A-pillar trim (See A-PILLAR TRIM REMOVAL/INSTALLATION.)

(4) Passenger-side lower panel (See PASSENGER-SIDE LOWER PANEL REMOVAL/INSTALLATION.)

(5) Selector lever knob (AT) (See AUTOMATIC TRANSMISSION SHIFT MECHANISM REMOVAL/INSTALLATION.)

(6) Shift lever knob (MT)

(7) Shift panel component (See SHIFT PANEL REMOVAL/INSTALLATION.)

(8) Upper panel (See UPPER PANEL REMOVAL/INSTALLATION.)

(9) Parking brake lever boot panel (See PARKING BRAKE LEVER BOOT PANEL REMOVAL/INSTALLATION.)

(10) Rear console (See REAR CONSOLE REMOVAL/INSTALLATION.)

(11) Front console panel (See FRONT CONSOLE PANEL REMOVAL/INSTALLATION.)

(12) Front console component (See FRONT CONSOLE REMOVAL/INSTALLATION.)

(13) Front cup holder bracket (See FRONT CUP HOLDER BRACKET REMOVAL/INSTALLATION.)

(14) Foot support (See FRONT CUP HOLDER BRACKET REMOVAL/INSTALLATION.)

(15) Woofer (See FRONT CUP HOLDER BRACKET REMOVAL/INSTALLATION.)

(16) BCM (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)

3. Connect the BCM connector.

4. Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.)

5. Verify that the voltages of each of the terminals are as indicated in the terminal voltage table (reference). (See Terminal Voltage Table (Reference).)

• If the voltage is not as specified in the terminal voltage table (reference), inspect the parts under Inspection item(s) and related wiring harnesses.

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Terminal Voltage Table (Reference)

Terminal

Signal

Connected to

Measurement condition

Voltage (V)

Inspection item(s)

1A

Power supply

HAZARD 15 A fuse

Under any condition

B+

HAZARD 15 A fuse

1B

Power supply

•  ROOM 25 A fuse

•  INTERIOR 15 A fuse

Under any condition

B+

•  ROOM 25 A fuse

•  INTERIOR 15 A fuse

1C

—

—

—

—

—

1D^*6

Brake light control

Brake light relay

Body control module (BCM) simulation item STOP_LMP_CTL is on

1.0 or less

Brake light relay

Body control module (BCM) simulation item STOP_LMP_CTL is off

B+

1E

Rear turn light (RH) control

Rear turn light (RH)

Ignition is switched ON (engine off or on)

Turn switch is in right turn position

1.0 or less ↔ B+

Rear turn light (RH)

Turn switch is in position other than above

1.0 or less

1F

—

—

—

—

—

1G

Rear turn light (LH) control

Rear turn light (LH)

Ignition is switched ON (engine off or on)

Turn switch is in left turn position

1.0 or less ↔ B+

Rear turn light (LH)

Turn switch is in position other than above

1.0 or less

1H

Interior light power supply

Map light

Under any condition

B+

Map light

1I

—

—

—

—

—

1J

—

—

—

—

—

1K

Ground

Body ground

Under any condition

1.0 or less

Body ground

1L

Ground

Body ground

Under any condition

1.0 or less

Body ground

2A

Lock input (door lock-link switch (driver's side))

Door latch and lock actuator (driver's side)

Driver's door is locked

1.0 or less

Door latch and lock actuator (driver's side)

Driver's door is unlocked

Approx. 10

2B

Unlock input (door lock-link switch (driver's side))

Door latch and lock actuator (driver's side)

Driver's door is locked

Approx. 9.5

Door latch and lock actuator (driver's side)

Driver's door is unlocked

1.0 or less

2C

CAN_L

CAN system related module

Terminal used for communication therefore determination based on terminal voltage is not possible.

2D

CAN_H

CAN system related module

Terminal used for communication therefore determination based on terminal voltage is not possible.

2E

Top lock switch signal

Top lock switch

Convertible top is open

1.0 or less

Top lock switch

Convertible top is closed

Approx. 9.5

2F

—

—

—

—

—

2G

Door latch switch (passenger's side) signal

Door latch and lock actuator (passenger's side)

Door (passenger's side) is open

1.0 or less

Door latch and lock actuator (passenger's side)

Door (passenger's side) is closed

Approx. 9.0

2H

Door latch switch (driver's side) signal

Door latch and lock actuator (driver's side)

Door (driver's side) is open

1.0 or less

Door latch and lock actuator (driver's side)

Door (driver's side) is closed

Approx. 9.5

2I

—

—

—

—

—

2J

Serial communication

Start stop unit

Terminal used for communication therefore determination based on terminal voltage is not possible.

2K^*1

Door lock switch signal

Door lock switch (RH)

Door lock switch is turned to unlock side (driver’s side or passenger’s side)

1.0 or less

Door lock switch (RH)

Door lock switch is turned to lock side (driver’s side or passenger’s side)

Approx. 1.25

Other

Approx 5.0

2L

Door key cylinder switch signal

Door latch and lock actuator (driver’s side)

Door key cylinder is turned to unlock side

1.0 or less

Door latch and lock actuator (driver’s side)

Door key cylinder is turned to lock side

Approx. 1.25

Other

Approx 5.0

2M

Lock input (door lock-link switch (passenger's side))

Door latch and lock actuator (passenger's side)

Passenger’s door is unlocked

1.0 or less

Door latch and lock actuator (passenger's side)

Passenger’s door is locked

B+

2N

—

—

—

—

—

2O

—

—

—

—

—

2P

—

—

—

—

—

2Q

Fuel sensor signal

Fuel gauge sender unit

Inspect fuel gauge sender unit and related wiring harness because determination based on terminal voltage is not possible.

(See FUEL GAUGE SENDER UNIT INSPECTION.)

2R

Fuel sensor ground

Fuel gauge sender unit

Under any condition

1.0 or less

Fuel gauge sender unit

2S

Trunk lid unlatch switch signal (exterior)

Trunk lid opener switch (exterior)

Trunk is opened

1.0 or less

Trunk lid opener switch (exterior)

Trunk is closed

Approx. 4.5

2T

—

—

—

—

—

2U

—

—

—

—

—

2V

—

—

—

—

—

2W

LIN communication

Theft-deterrent siren

Terminal used for communication therefore determination based on terminal voltage is not possible.

2X

—

—

—

—

—

2Y

LIN communication

Electrical supply unit (ESU)

Terminal used for communication therefore determination based on terminal voltage is not possible.

2Z^*6

Brake switch signal

•  Start stop unit

•  Brake switch (No.1 signal)

Brake pedal is depressed

B+

•  Start stop unit

•  Brake switch (No.1 signal)

Brake pedal is not depressed

1.0 or less

2AA

—

—

—

—

—

2AB

—

—

—

—

—

2AC

Trunk lid latch switch signal

Trunk lid latch and release actuator

Trunk is opened

1.0 or less

Trunk lid latch and release actuator

Trunk is closed

Approx. 9.5

2AD

—

—

—

—

—

2AE

—

—

—

—

—

2AF

—

—

—

—

—

3A

Front turn light (RH) control

Front turn light (RH)

Ignition is switched ON (engine off or on)

Turn switch is in right turn position

1.0 or less ↔ B+

Front turn light (RH)

Turn switch is in position other than above

1.0 or less

3B

Front turn light (LH) control

Front turn light (LH)

Ignition is switched ON (engine off or on)

Turn switch is in left turn position

1.0 or less ↔ B+

Front turn light (LH)

Turn switch is in position other than above

1.0 or less

3C

CAN_H

CAN system related module

Terminal used for communication therefore determination based on terminal voltage is not possible.

3D

CAN_L

CAN system related module

Terminal used for communication therefore determination based on terminal voltage is not possible.

3E

Blower motor relay control

•  Blower relay

•  HEATER 40 A fuse

Ignition is switched ON (engine off or on)

Blower motor is operated using fan switch

1.0 or less

•  Blower relay

•  HEATER 40 A fuse

Blower motor is turned off by pressing climate control unit OFF button

B+

3F

Windshield wiper INT relay control

Wiper INT relay

Ignition is switched ON (engine off or on)

Windshield wiper switch is in position other than OFF

1.0 or less

Wiper INT relay

Windshield wiper switch is in OFF position

B+

3G

Windshield wiper motor (HI) control

Wiper HI relay

Ignition is switched ON (engine off or on)

Windshield wiper switch is in HIGH position

1.0 or less

Wiper HI relay

Windshield wiper switch is in OFF position

B+

3H

Horn relay control

Horn relay

Ignition is switched ON (engine off or on)

Horn switch is on

1.0 or less

Horn relay

Horn switch is off

B+

3I

—

—

—

—

—

3J

—

—

—

—

—

3J

Head light cleaner relay control

•  Head light cleaner relay

•  H/CLEAN 20 A fuse

Ignition is switched ON (engine off or on)

Connect the M-MDS and turn on the "H/L_CLN_RY" using the body control module (BCM) simulation function

1.0 or less

•  Head light cleaner relay

•  H/CLEAN 20 A fuse

Connect the M-MDS and turn off the "H/L_CLN_RY" using the body control module (BCM) simulation function

B+

3K

Rear window defogger relay control

Rear window defogger relay

Ignition is switched ON (engine off or on)

Rear window defogger switch is on

1.0 or less

Rear window defogger relay

Rear window defogger switch is off

B+

3L

—

—

—

—

—

3M

Autostop switch signal

Wiper motor

Ignition is switched ON (engine off or on)

Windshield wipers are stopped in position other than park

1.0 or less

Wiper motor

Windshield wipers are stopped in park position

B+

3N

Power supply

•  ENG+B 7.5 A fuse

•  ROOM 25 A fuse

Under any condition

B+

•  ENG+B 7.5 A fuse

•  ROOM 25 A fuse

3O

Ignition power supply

METER1 10 A fuse

Ignition is switched ON (engine off or on)

B+

METER1 10 A fuse

The ignition is switched off (LOCK)

1.0 or less

3P

—

—

—

—

—

3Q^*2

Washer fluid level sensor signal

Washer fluid level sensor

Ignition is switched ON (engine off or on)

Washer fluid level sensor is less than MIN (washer fluid level sensor on)

1.0 or less

Washer fluid level sensor

Washer fluid level sensor is MIN or more (Washer fluid level sensor off)

B+

3R

Brake fluid level sensor signal

Brake fluid level sensor

Ignition is switched ON (engine off or on)

Brake fluid level sensor is less than MIN (brake fluid level sensor on)

1.0 or less

Brake fluid level sensor

Brake fluid level sensor is MIN or more (brake fluid level sensor off)

B+

3S

LIN communication

Current sensor

Terminal used for communication therefore determination based on terminal voltage is not possible.

3T

Horn switch control

Horn switch

Ignition is switched ON (engine off or on)

Horn switch is on (long press)

1.0 or less

Horn switch

Horn switch is off

B+

3U

Trunk unlatch switch signal (interior)

Trunk lid opener switch (interior)

Trunk lid opener switch (interior) is on (trunk lid opener switch (interior) is pressed)

1.0 or less

Trunk lid opener switch (interior)

Trunk lid opener switch (interior) is off (trunk lid opener switch (interior) is not pressed)

B+

3V

—

—

—

—

—

3W^*4

Bonnet latch switch signal

Bonnet latch switch

Bonnet is open

Approx. 9.0

Bonnet latch switch

Bonnet is closed

1.0 or less

3X

LIN communication

•  Auto-light sensor/rain sensor^*3

•  Theft-deterrenet sensor^*5

Terminal used for communication therefore determination based on terminal voltage is not possible.

Terminal	Signal	Connected to	Measurement condition	Voltage (V)	Inspection item(s)
1A	Power supply	HAZARD 15 A fuse	Under any condition	B+	HAZARD 15 A fuse
1B	Power supply	• ROOM 25 A fuse • INTERIOR 15 A fuse	Under any condition	B+	• ROOM 25 A fuse • INTERIOR 15 A fuse
1C	—	—	—	—	—
1D^*6	Brake light control	Brake light relay	Body control module (BCM) simulation item STOP_LMP_CTL is on	1.0 or less	Brake light relay
Body control module (BCM) simulation item STOP_LMP_CTL is off	B+
1E	Rear turn light (RH) control	Rear turn light (RH)	Ignition is switched ON (engine off or on)	Turn switch is in right turn position	1.0 or less ↔ B+	Rear turn light (RH)
Turn switch is in position other than above	1.0 or less
1F	—	—	—	—	—
1G	Rear turn light (LH) control	Rear turn light (LH)	Ignition is switched ON (engine off or on)	Turn switch is in left turn position	1.0 or less ↔ B+	Rear turn light (LH)
Turn switch is in position other than above	1.0 or less
1H	Interior light power supply	Map light	Under any condition	B+	Map light
1I	—	—	—	—	—
1J	—	—	—	—	—
1K	Ground	Body ground	Under any condition	1.0 or less	Body ground
1L	Ground	Body ground	Under any condition	1.0 or less	Body ground
2A	Lock input (door lock-link switch (driver's side))	Door latch and lock actuator (driver's side)	Driver's door is locked	1.0 or less	Door latch and lock actuator (driver's side)
Driver's door is unlocked	Approx. 10
2B	Unlock input (door lock-link switch (driver's side))	Door latch and lock actuator (driver's side)	Driver's door is locked	Approx. 9.5	Door latch and lock actuator (driver's side)
Driver's door is unlocked	1.0 or less
2C	CAN_L	CAN system related module	Terminal used for communication therefore determination based on terminal voltage is not possible.
2D	CAN_H	CAN system related module	Terminal used for communication therefore determination based on terminal voltage is not possible.
2E	Top lock switch signal	Top lock switch	Convertible top is open	1.0 or less	Top lock switch
Convertible top is closed	Approx. 9.5
2F	—	—	—	—	—
2G	Door latch switch (passenger's side) signal	Door latch and lock actuator (passenger's side)	Door (passenger's side) is open	1.0 or less	Door latch and lock actuator (passenger's side)
Door (passenger's side) is closed	Approx. 9.0
2H	Door latch switch (driver's side) signal	Door latch and lock actuator (driver's side)	Door (driver's side) is open	1.0 or less	Door latch and lock actuator (driver's side)
Door (driver's side) is closed	Approx. 9.5
2I	—	—	—	—	—
2J	Serial communication	Start stop unit	Terminal used for communication therefore determination based on terminal voltage is not possible.
2K^*1	Door lock switch signal	Door lock switch (RH)	Door lock switch is turned to unlock side (driver’s side or passenger’s side)	1.0 or less	Door lock switch (RH)
Door lock switch is turned to lock side (driver’s side or passenger’s side)	Approx. 1.25
Other	Approx 5.0
2L	Door key cylinder switch signal	Door latch and lock actuator (driver’s side)	Door key cylinder is turned to unlock side	1.0 or less	Door latch and lock actuator (driver’s side)
Door key cylinder is turned to lock side	Approx. 1.25
Other	Approx 5.0
2M	Lock input (door lock-link switch (passenger's side))	Door latch and lock actuator (passenger's side)	Passenger’s door is unlocked	1.0 or less	Door latch and lock actuator (passenger's side)
Passenger’s door is locked	B+
2N	—	—	—	—	—
2O	—	—	—	—	—
2P	—	—	—	—	—
2Q	Fuel sensor signal	Fuel gauge sender unit	Inspect fuel gauge sender unit and related wiring harness because determination based on terminal voltage is not possible. (See FUEL GAUGE SENDER UNIT INSPECTION.)
2R	Fuel sensor ground	Fuel gauge sender unit	Under any condition	1.0 or less	Fuel gauge sender unit
2S	Trunk lid unlatch switch signal (exterior)	Trunk lid opener switch (exterior)	Trunk is opened	1.0 or less	Trunk lid opener switch (exterior)
Trunk is closed	Approx. 4.5
2T	—	—	—	—	—
2U	—	—	—	—	—
2V	—	—	—	—	—
2W	LIN communication	Theft-deterrent siren	Terminal used for communication therefore determination based on terminal voltage is not possible.
2X	—	—	—	—	—
2Y	LIN communication	Electrical supply unit (ESU)	Terminal used for communication therefore determination based on terminal voltage is not possible.
2Z^*6	Brake switch signal	• Start stop unit • Brake switch (No.1 signal)	Brake pedal is depressed	B+	• Start stop unit • Brake switch (No.1 signal)
Brake pedal is not depressed	1.0 or less
2AA	—	—	—	—	—
2AB	—	—	—	—	—
2AC	Trunk lid latch switch signal	Trunk lid latch and release actuator	Trunk is opened	1.0 or less	Trunk lid latch and release actuator
Trunk is closed	Approx. 9.5
2AD	—	—	—	—	—
2AE	—	—	—	—	—
2AF	—	—	—	—	—
3A	Front turn light (RH) control	Front turn light (RH)	Ignition is switched ON (engine off or on)	Turn switch is in right turn position	1.0 or less ↔ B+	Front turn light (RH)
Turn switch is in position other than above	1.0 or less
3B	Front turn light (LH) control	Front turn light (LH)	Ignition is switched ON (engine off or on)	Turn switch is in left turn position	1.0 or less ↔ B+	Front turn light (LH)
Turn switch is in position other than above	1.0 or less
3C	CAN_H	CAN system related module	Terminal used for communication therefore determination based on terminal voltage is not possible.
3D	CAN_L	CAN system related module	Terminal used for communication therefore determination based on terminal voltage is not possible.
3E	Blower motor relay control	• Blower relay • HEATER 40 A fuse	Ignition is switched ON (engine off or on)	Blower motor is operated using fan switch	1.0 or less	• Blower relay • HEATER 40 A fuse
Blower motor is turned off by pressing climate control unit OFF button	B+
3F	Windshield wiper INT relay control	Wiper INT relay	Ignition is switched ON (engine off or on)	Windshield wiper switch is in position other than OFF	1.0 or less	Wiper INT relay
Windshield wiper switch is in OFF position	B+
3G	Windshield wiper motor (HI) control	Wiper HI relay	Ignition is switched ON (engine off or on)	Windshield wiper switch is in HIGH position	1.0 or less	Wiper HI relay
Windshield wiper switch is in OFF position	B+
3H	Horn relay control	Horn relay	Ignition is switched ON (engine off or on)	Horn switch is on	1.0 or less	Horn relay
Horn switch is off	B+
3I	—	—	—	—	—
3J	—	—	—	—	—
3J	Head light cleaner relay control	• Head light cleaner relay • H/CLEAN 20 A fuse	Ignition is switched ON (engine off or on)	Connect the M-MDS and turn on the "H/L_CLN_RY" using the body control module (BCM) simulation function	1.0 or less	• Head light cleaner relay • H/CLEAN 20 A fuse
Connect the M-MDS and turn off the "H/L_CLN_RY" using the body control module (BCM) simulation function	B+
3K	Rear window defogger relay control	Rear window defogger relay	Ignition is switched ON (engine off or on)	Rear window defogger switch is on	1.0 or less	Rear window defogger relay
Rear window defogger switch is off	B+
3L	—	—	—	—	—
3M	Autostop switch signal	Wiper motor	Ignition is switched ON (engine off or on)	Windshield wipers are stopped in position other than park	1.0 or less	Wiper motor
Windshield wipers are stopped in park position	B+
3N	Power supply	• ENG+B 7.5 A fuse • ROOM 25 A fuse	Under any condition	B+	• ENG+B 7.5 A fuse • ROOM 25 A fuse
3O	Ignition power supply	METER1 10 A fuse	Ignition is switched ON (engine off or on)	B+	METER1 10 A fuse
The ignition is switched off (LOCK)	1.0 or less
3P	—	—	—	—	—
3Q^*2	Washer fluid level sensor signal	Washer fluid level sensor	Ignition is switched ON (engine off or on)	Washer fluid level sensor is less than MIN (washer fluid level sensor on)	1.0 or less	Washer fluid level sensor
Washer fluid level sensor is MIN or more (Washer fluid level sensor off)	B+
3R	Brake fluid level sensor signal	Brake fluid level sensor	Ignition is switched ON (engine off or on)	Brake fluid level sensor is less than MIN (brake fluid level sensor on)	1.0 or less	Brake fluid level sensor
Brake fluid level sensor is MIN or more (brake fluid level sensor off)	B+
3S	LIN communication	Current sensor	Terminal used for communication therefore determination based on terminal voltage is not possible.
3T	Horn switch control	Horn switch	Ignition is switched ON (engine off or on)	Horn switch is on (long press)	1.0 or less	Horn switch
Horn switch is off	B+
3U	Trunk unlatch switch signal (interior)	Trunk lid opener switch (interior)	Trunk lid opener switch (interior) is on (trunk lid opener switch (interior) is pressed)	1.0 or less	Trunk lid opener switch (interior)
Trunk lid opener switch (interior) is off (trunk lid opener switch (interior) is not pressed)	B+
3V	—	—	—	—	—
3W^*4	Bonnet latch switch signal	Bonnet latch switch	Bonnet is open	Approx. 9.0	Bonnet latch switch
Bonnet is closed	1.0 or less
3X	LIN communication	• Auto-light sensor/rain sensor^3 • Theft-deterrenet sensor^5	Terminal used for communication therefore determination based on terminal voltage is not possible.

*1 :With door lock switch

*2 :With washer fluid level sensor

*3 :With auto light system/auto wiper system

*4 :With bonnet latch switch

*5 :With theft-deterrent siren

*6 :With smart city brake support (SCBS)