BODY CONTROL MODULE (BCM) INSPECTION


id094000800300

1.  Remove the dashboard under cover. (See DASHBOARD UNDER COVER REMOVAL/INSTALLATION.)

2.  Remove the glove compartment. (See GLOVE COMPARTMENT REMOVAL/INSTALLATION.)

3.  Measure the voltage at each terminal and inspect for the continuity between the terminals and ground is as indicated in the Terminal Voltage Tables (Reference).

•  If the voltage or continuity is not as specified in the Terminal Voltage Table (Reference), inspect the parts under “Inspection item (s)”.
―  If the system does not work properly even though the parts or related wiring harnesses do not have any malfunction, replace the BCM.


Terminal Voltage Table (Reference)

adejjw00000675

Terminal

Signal

Connected to

Measurement condition

Voltage (V)

Inspection item (s)

1A
Windshield wiper signal
Windshield wiper motor
Ignition switch at ON
B+
•  Windshield wiper motor
•  Related wiring harness
Ignition switch at off
1.0 or less
1B
Windshield wiper (HI) signal
Windshield wiper motor
Ignition switch at ON
Windshield wiper operating at HI
B+
•  Windshield wiper motor
•  Related wiring harness
OFF
1.0 or less
1C
Rear window defroster power supply
R.DEF 20 A fuse
Under any condition
B+
•  R.DEF 20A fuse
•  Related wiring harness
1D
Windshield wiper (Lo) signal
Windshield wiper motor
Ignition switch at ON
Windshield wiper operating at Lo
B+
•  Windshield wiper motor
•  Related wiring harness
Windshield wiper not operating
1.0 or less
1E
TNS power supply
TAIL 15 A fuse
Under any condition
B+
•  TAIL 15A fuse
•  Related wiring harness
1F
Windshield wiper auto stop signal
Windshield wiper motor
Ignition switch at ON
Windshield wiper operating
B+
•  Windshield wiper motor
•  Related wiring harness
Windshield wiper not operating
1.0 or less
1G
Front TNS inhibited
Parking light
TNS ON
B+
•  Parking light
•  Related wiring harness
TNS OFF
1.0 or less
1H
Windshield washer motor control
Washer motor
Ignition switch at ON
Windshield washer motor operating
B+
•  Washer motor
•  Related wiring harness
Windshield washer motor not operating
1.0 or less
1I
Hazard power supply
HAZARD 10A fuse
Under any condition
B+
•  HAZARD 10A fuse
•  Related wiring harness
1J
Rear window washer motor control
Washer motor
Ignition switch at ON
Rear washer motor operating
B+
•  Washer motor
•  Related wiring harness
Rear washer motor not operating
1.0 or less
1K
Front turn light (RH) control
•  Front turn light (RH)
•  Front side turn light (RH)
Turn switch (RH) on
Front turn light (RH) flashes
Alternates between 1.0 or less and B+
•  Front turn light (RH)
•  Front side turn light (RH)
•  Related wiring harness
Hazard warning switch on
Front turn light (RH) not illuminated
1.0 or less
1L
Front turn light (LH) control
•  Front turn light (LH)
•  Front side turn light (LH)
Turn switch (LH) on
Front turn light (LH) flashes
Alternates between 1.0 or less and B+
•  Front turn light (LH)
•  Front side turn light (LH)
•  Related wiring harness
Hazard warning switch on
Front turn light (LH) not illuminated
1.0 or less
1M
1N
1O
Interior light power supply
ROOM 15 A fuse
Under any condition
B+
•  ROOM 15 A fuse
•  Related wiring harness
1P
Door lock power supply
D/L 20 A fuse
Under any condition
B+
•  D/L 20 A fuse
•  Related wiring harness
2A
2B
2C
2D
Ground signal
Body ground
Under any condition
1.0 or less
Related wiring harness
2E
2F
Rear window wiper power supply
(IG 2)
•  R.WIP 10 A fuse
•  Ignition switch
Ignition switch at ON
B+
•  R.WIP 10 A fuse
•  Ignition switch
•  Related wiring harness
Ignition switch at off
1.0 or less
2G
Meter power supply
(IG 1)
•  METER 10 A fuse
•  Ignition switch
Ignition switch at ON
B+
•  METER 10A fuse
•  Ignition switch
•  Related wiring harness
Ignition switch is off
1.0 or less
2H
Windshield washer switch signal
Wiper and washer switch
Ignition switch at ON
Windshield washer switch on
1.0 or less
•  Wiper and washer switch
•  Related wiring harness
Windshield washer switch off
B+
2I
2J
2K
2L
Rear window washer switch signal
Wiper and washer switch
Ignition switch at ON
Rear window washer switch on
1.0 or less
•  Wiper and washer switch
•  Related wiring harness
Rear window washer switch off
B+
2M
Signal ground
Body ground
Under any condition
1.0 or less
Related wiring harness
2N
Windshield wiper power supply
(IG 2)
•  F.WIP 20 A fuse
•  Ignition switch
Ignition switch at ON
B+
•  F.WIP 20A fuse
•  Ignition switch
•  Related wiring harness
Ignition switch at off
1.0 or less
2O
Illumination output
•  ILLUMI 7.5 A fuse
•  Illumination light
TNS ON
B+
•  ILLUMI 7.5 A fuse
•  Illumination light
•  Related wiring harness
TNS OFF
1.0 or less
2P
3A
Rear window defroster output
•  Filament
•  M.DEF 7.5 A fuse
Ignition switch at ON
Rear window defroster on
B+
•  Filament
•  M.DEF 7.5 A fuse
•  Related wiring harness
Rear window defroster off
1.0 or less
3B
3C
Liftgate opener actuator power supply
Liftgate latch and lock actuator
Liftgate opener switch pressed, lock release operation
B+
•  Liftgate latch and lock actuator
•  Related wiring harness
Other
1.0 or less
3D
Rear window wiper power supply
Rear wiper motor
Ignition switch at ON
B+
•  Rear wiper motor
•  Related wiring harness
Ignition switch is off
1.0 or less
3E*6
Door lock control
Door lock actuators
Double locking system activated
1.0 or less → B+→ 1.0 or less
•  Door lock actuators
•  Related wiring harness
Other
1.0 or less
3F
Rear window wiper control
Rear wiper motor
Ignition switch at ON
Rear wiper activated
1.0 or less
•  Rear motor
•  Related wiring harness
Rear wiper not activated
B+
3G
 
3H
Rear TNS light signal
•  Tail light
•  License plate light
TNS ON
B+
•  Tail light
•  License plate light
•  Related wiring harness
TNS OFF
1.0 or less
3I
Interior light control
Interior light
Interior light on by opening any door
Interior light off by closing all doors
Wave pattern (See Pattern 7.)
•  Interior light
•  Related wiring harness
3J
Rear turn light (RH) control
Rear turn light (RH)
Turn switch (RH) on
Rear turn light (RH) flashes
Alternates between 1.0 or less and B+
•  Rear turn light (RH)
•  Related wiring harness
Hazard warning switch on
Rear turn light (RH) not illuminated
1.0 or less
3K
3L
Rear turn light (LH) control
Rear turn light (LH)
Turn switch (LH) on
Rear turn light (LH) flashes
Alternates between 1.0 or less and B+
•  Rear turn light (LH)
•  Related wiring harness
Hazard warning switch on
Rear turn light (LH) not illuminated
1.0 or less
3M
Door lock control
Door lock actuators
Door lock actuator locking (without double locking system)
B+
•  Door lock actuator
•  Related wiring harness
Door lock actuator locking (with double locking system)
1.0 or less
Other
1.0 or less
3N
3O
Door unlock control
Door lock actuator
(Driver’s side)
Door lock actuator unlocking
B+
•  Door lock actuator
•  Related wiring harness
Other
1.0 or less
3P
Power supply
Interior light
Under any condition
B+
•  Interior light
•  Related wiring harness
4A
Brake fluid level signal
Brake fluid level sensor
Ignition switch at ON
Brake fluid level less than MIN
1.0 or less
•  Brake fluid level sensor
•  Related wiring harness
Brake fluid level above MIN.
5
4B*4
Oil pressure switch signal
Oil pressure switch
Engine running
B+
•  Oil pressure switch
•  Related wiring harness
Engine not running
1.0 or less
4C*3
Back-up light signal
Back-up light switch
Shift lever is in R position
B+
•  Back-up light switch
•  Related wiring harness
Shift lever is not in R position
1.0 or less
4D
4E
Rear fog light control (vehicles with rear fog light)
Rear fog light relay
Light switch at TNS position
Rear fog light switch ON
1.0 or less
•  Rear fog light relay
•  Related wiring harness
Rear fog light switch OFF
B+
4F
4G
Headlight low control (4-Beam Type Headlight)
Headlight relay (LO)
Headlights on
1.0 or less
•  Headlight relay (LO)
•  Related wiring harness
Headlights off
B+
4H
4I
Front fog light control
Front fog light relay
Light switch at TNS position
Front fog light switch ON
1.0 or less
•  Front fog light relay
•  Related wiring harness
Front fog light switch OFF
B+
4J
4K
4L
4M
Headlight low control (2-Beam Type Headlight)
Headlight relay (LO)
Light switch at LO position
1.0 or less
•  Headlight relay (LO)
•  Related wiring harness
Other
B+
4N
4O
Headlight high control
Headlight relay (HI)
Light switch at HEAD position
Light switch at HI or PASS position
1.0 or less
•  Headlight relay (HI)
•  Related wiring harness
Light switch at LO position
B+
4P
4Q
4R
4S
4T
4U
CAN_H
CAN system related module
Terminal used for communication therefore determination based on terminal voltage inspection not possible.
4V
CAN_H
CAN system related module
Terminal used for communication therefore determination based on terminal voltage inspection not possible.
4W
CAN_L
CAN system related module
Terminal used for communication therefore determination based on terminal voltage inspection not possible.
4X
CAN_L
CAN system related module
Terminal used for communication therefore determination based on terminal voltage inspection not possible.
6A
Turn switch input (RH)
Turn switch
Turn switch at RH position
1.0 or less
•  Turn switch
•  Related wiring harness
Turn switch at off position
Wave pattern (See Pattern 1.)
6B
Turn switch input (LH)
Turn switch
Turn switch at LH position
1.0 or less
•  Turn switch
•  Related wiring harness
Turn switch at off position
Wave pattern (See Pattern 1.)
6C
Rear wiper switch input (ON)
Wiper and washer switch
Rear wiper at on position
1.0 or less
•  Wiper and washer switch
•  Related wiring harness
Rear wiper at off position
Wave pattern (See Pattern 1.)
6D
Rear window defroster switch input
Climate control unit (rear window defroster switch)
Rear window defroster switch pressed and held
1.0 or less
•  Climate control unit (rear window defroster switch)
•  Related wiring harness
Rear window defroster switch not pressed
Wave pattern (See Pattern 1.)
6E
Headlight switch input (ON)
Light switch
Light switch in ON position
1.0 or less
•  Light switch
•  Related wiring harness
Light switch not at ON position
B+
6F
Windshield wiper switch input (HI)
Wiper and washer switch
Wiper switch in HI position
1.0 or less
•  Wiper and washer switch
•  Related wiring harness
Wiper switch not at HI position
Wave pattern (See Pattern 2.)
6G
Rear window defroster indicator signal
Climate control unit (rear window defroster indicator)
Ignition switch at ON
Rear window defroster indicator illuminated
1.0 or less
•  Climate control unit (rear window defroster indicator)
•  Related wiring harness
Rear window defroster indicator turned off
B+
6H
Sensitivity adjustment volume ground
Wiper and washer switch
Under any condition
1.0 or less
•  Wiper and washer switch
•  Related wiring harness
6I
Headlight switch input (HI)
Light switch
HI beam at passing position or lights on status
1.0 or less
•  Light switch
•  Related wiring harness
Except above
Wave pattern (See Pattern 2.)
6J
TNS switch signal
Light switch
TNS ON
1.0 or less
•  Light switch
•  Related wiring harness
TNS OFF
B+
6K
Headlight switch input (front fog light)
Light switch
Front fog light switch in on position
1.0 or less
•  Light switch
•  Related wiring harness
Front fog light switch in off position
Wave pattern (See Pattern 2.)
6L
Headlight switch input (vehicles with auto light/wiper system)
Light switch
Light switch at AUTO position
1.0 or less
•  Light switch
•  Related wiring harness
Light switch OFF position
Wave pattern (See Pattern 4.)
6M
Headlight switch input (vehicles with rear fog light)
Light switch
Rear fog light switch in on position
1.0 or less
•  Light switch
•  Related wiring harness
Rear fog light switch in off position
Wave pattern (See Pattern 2.)
6N
Windshield wiper switch input (Lo)
Wiper and washer switch
Ignition switch at ON
Windshield wiper switch LO position
1.0 or less
•  Wiper and washer switch
•  Related wiring harness
Windshield wiper switch off or INT position
B+
6O
Headlight switch input (LO)
Light switch
Light switch at LO position
1.0 or less
•  Light switch
•  Related wiring harness
Light switch at HI position
Wave pattern (See Pattern 2.)
Light switch at OFF or TNS position
B+
6P
Sensitivity adjustment volume
(Auto wiper only)
Wiper and washer switch
Sensitivity adjustment range for auto wiper turned from + position to - position
Switch position 1 position
Wave pattern (See 1 position.)
•  Wiper and washer switch
•  Related wiring harness
Switch position 2 position
Wave pattern (See 2 position.)
Switch position 3 position
Wave pattern (See 3 position.)
Switch position 4 position
Wave pattern (See 4 position.)
Switch position 5 position
Wave pattern (See 5 position.)
Switch position 6 position
0
6Q
Hazard warning switch signal
Hazard warning switch
Hazard warning switch on
1.0 or less
•  Hazard warning switch
•  Related wiring harness
Hazard warning switch off
Wave pattern (See Pattern 3.)
6R
Key reminder switch
Key reminder switch
Key inserted
B+
•  Key reminder switch
•  Related wiring harness
Key removed
1.0 or less
6S
Windshield wiper switch input
Wiper and washer switch
Ignition switch at ON
Wiper switch at off position
Wave pattern (See Pattern 1.)
•  Wiper and washer switch
•  Related wiring harness
Wiper switch at LO or HI position
Wave pattern (See Pattern 5.)
Wiper switch at INT position
1.0 or less
6T
6U*2
Liftgate opener switch input
Liftgate opener switch
•  Liftgate opener switch
•  Related wiring harness
6V
CAN_L
CAN system related module
Terminal used for communication therefore determination based on terminal voltage inspection not possible.
6W
Serial communication
•  Keyless receiver
•  Instrument cluster
Terminal used for communication therefore determination based on terminal voltage inspection not possible.
6X
CAN_H
CAN system related module
Terminal used for communication therefore determination based on terminal voltage inspection not possible.
7A
Liftgate opener switch
Liftgate opener switch
Liftgate opener switch not pressed
1.0 or less
•  Liftgate opener switch
•  Related wiring harness
Liftgate opener switch pressed and held
approx. 3*1
7B
Parking brake switch signal
Parking brake switch
Ignition switch at ON
Parking brake applied
1.0 or less
•  Parking brake switch
•  Related wiring harness
Parking brake not applied
B+
7C
Key cylinder switch signal
Door key cylinder switch
Driver's door key cylinder rotated to lock direction
Wave pattern (See Pattern 6.)
•  Door key cylinder switch
•  Related wiring harness
Driver's door key cylinder rotated to unlock direction
1.0 or less
Driver’s door key cylinder at neutral position after rotating in lock or unlock direction
Wave pattern (See Pattern 1.)
7D
7E
All outer door handles
Power window main switch
Any door open
1.0 or less
•  Power window main switch
•  Related wiring harness
All doors closed
B+
7F
7G*5
Rear door latch switch (LH)
Rear door latch switch (LH)
Rear door (LH) open
Wave pattern (See Pattern 3.)
•  Rear door latch switch (LH)
•  Related wiring harness
Rear door (LH) closed
1.0 or less
7H
7I
Front door latch switch (driver side)
Front door latch switch (driver side)
Front door (driver side) open
Wave pattern (See Pattern 3.)
•  Front door latch switch (driver side)
•  Related wiring harness
Front door (driver side) closed
1.0 or less
7J
7K
Lock input (door lock-link switch)
Door lock-link switch (driver side)
Driver's door locked
1.0 or less
•  Door lock-link switch (driver side)
•  Related wiring harness
Driver's door unlocked
Wave pattern (See Pattern 3.)
7L
7M
Front door latch switch (passenger side)
Front door latch switch (passenger side)
Front door (passenger side) open
Wave pattern (See Pattern 3.)
•  Front door latch switch (passenger side)
•  Related wiring harness
Front door (passenger side) closed
1.0 or less
7N
7O*5
Rear door latch switch (RH)
Rear door latch switch (RH)
Rear door (RH) open
Wave pattern (See Pattern 3.)
•  Rear door latch switch (RH)
•  Related wiring harness
Rear door (RH) closed
1.0 or less
7P
7Q
Unlock input (door lock-link switch)
Door lock-link switch
Driver's door locked
Wave pattern (See Pattern 3.)
•  Door lock-link switch
•  Related wiring harness
Driver's door unlocked
1.0 or less
7R
7S
Liftgate switch signal
Liftgate switch
Liftgate opened
1.0 or less
•  Liftgate switch
•  Related wiring harness
Liftgate closed
B+
7T
7U
LIN communication
Rain sensor
Terminal used for communication therefore determination based on terminal voltage inspection not possible.
7V
CAN_L
•  CAN system related module
•  DLC-2
Terminal used for communication therefore determination based on terminal voltage inspection not possible.
7W
7X
CAN_H
•  CAN system related module
•  DLC-2
Terminal used for communication therefore determination based on terminal voltage inspection not possible.

*1  :With advanced keyless and start system
*2  :Without advanced keyless and start system
*3  :MZ-CD 1.6
*4  :Except MZ-CD 1.6
*5  :5HB
*6  :With double locking system

Generated pulse (reference)


Pattern 1

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•  Terminal:
―  Turn switch input (RH): 6A (+) ↔ body ground (-)
―  Turn switch input (LH): 6B (+) ↔ body ground (-)
―  Rear wiper switch input (ON): 6C (+) ↔ body ground (-)
―  Rear window defroster switch input: 6D (+) ↔ body ground (-)
―  Windshield wiper switch input: 6S (+) ↔ body ground (-)
―  Key cylinder switch signal: 7C (+) ↔ body ground (-)
―  Lock / unlock signal: 7P (+) ↔ body ground (-)
•  Oscilloscope setting: 2 V/DIV (Y), 1 ms/DIV (X), DC range


Pattern 2

am2uuw00000734
•  Terminal:
―  Windshield wiper switch input (HI): 6F (+) ↔ body ground (-)
―  Headlight switch input (HI): 6I (+) ↔ body ground (-)
―  Headlight switch input (front fog light): 6K (+) ↔ body ground (-)
―  Headlight switch input (vehicles with rear fog light): 6M (+) ↔ body ground (-)
―  Headlight switch input (LO): 6O (+) ↔ body ground (-)
•  Oscilloscope setting: 2 V/DIV (Y), 1 ms/DIV (X), DC range


Pattern 3

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•  Terminal:
―  Hazard warning switch signal: 6Q (+) ↔ body ground (-)
―  Rear door latch switch (LH): 7G (+) ↔ body ground (-)
―  Front door latch switch (driver side): 7I (+) ↔ body ground (-)
―  Lock input (door lock-link switch): 7K (+) ↔ body ground (-)
―  Lock input (door lock-link switch): 7L (+) ↔ body ground (-)
―  Front door latch switch (passenger side): 7M (+) ↔ body ground (-)
―  Rear door latch switch (RH): 7O (+) ↔ body ground (-)
―  Unlock input (door lock-link switch): 7Q (+) ↔ body ground (-)
•  Oscilloscope setting: 2 V/DIV (Y), 1 ms/DIV (X), DC range


Pattern 4

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•  Terminal:6L (+) ↔ body ground (-)
•  Oscilloscope setting: 2 V/DIV (Y), 1 ms/DIV (X), DC range


Pattern 5

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•  Terminal: 6S (+) ↔ body ground (-)
•  Oscilloscope setting: 2 V/DIV (Y), 1 ms/DIV (X), DC range


Pattern 6

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•  Terminal:
―  Key cylinder switch signal: 7C (+) ↔ body ground (-)
―  Lock / unlock signal: 7P (+) ↔ body ground (-)
•  Oscilloscope setting: 2 V/DIV (Y), 1 ms/DIV (X), DC range


Pattern 7

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•  Terminal: 3I (+) ↔ body ground (-)
•  Oscilloscope setting: 5 V/DIV (Y), 5 ms/DIV (X), DC range


Liftgate Opener Switch Input Signal Pulse (Reference)


Liftgate opener switch not pressed

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•  Terminal: 6U (+) ↔ body ground (-)
•  Oscilloscope setting: 2 V/DIV (Y), 1 ms/DIV (X), DC range
•  Measurement condition: Liftgate opener switch not pressed


Liftgate opener switch pressed

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•  Terminal: 6U (+) ↔ body ground (-)
•  Oscilloscope setting: 2 V/DIV (Y), 1 ms/DIV (X), DC range
•  Measurement condition: Liftgate opener switch pressed


Liftgate Opener Switch Signal Pulse (Reference)

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•  Terminal: 7A (+) ↔ body ground (-)
•  Oscilloscope setting: 2 V/DIV (Y), 1 ms/DIV (X), DC range
•  Measurement condition: Liftgate opener switch pressed

Door lock actuators 2-step unlocking (Reference)

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•  Terminal: 3E (+) ↔ body ground (-)
•  Oscilloscope setting: 2 V/DIV (Y), 2 ms/DIV (X), DC range
•  Measurement condition: Door lock actuators 2-step unlocking

Sensitivity adjustment volume (Reference)


1 position

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•  Terminal: 6P (+) ↔ body ground (-)
•  Oscilloscope setting: 2 V/DIV (Y), 1 ms/DIV (X), DC range


2 position

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•  Terminal: 6P (+) ↔ body ground (-)
•  Oscilloscope setting: 2 V/DIV (Y), 1 ms/DIV (X), DC range


3 position

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•  Terminal: 6P (+) ↔ body ground (-)
•  Oscilloscope setting: 2 V/DIV (Y), 1 ms/DIV (X), DC range


4 position

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•  Terminal: 6P (+) ↔ body ground (-)
•  Oscilloscope setting: 2 V/DIV (Y), 1 ms/DIV (X), DC range


5 position

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•  Terminal: 6P (+) ↔ body ground (-)
•  Oscilloscope setting: 2 V/DIV (Y), 1 ms/DIV (X), DC range