BODY CONTROL MODULE (BCM) INSPECTION

BODY CONTROL MODULE (BCM) INSPECTIONSM2446572

id094000800300

1.Disconnect the negative battery cable.

2.Remove the following parts:

1. Front scuff plate. (LH) (See FRONT SCUFF PLATE REMOVAL/INSTALLATION.)

2. Front side trim. (LH) (See FRONT SIDE TRIM REMOVAL/INSTALLATION.)

3. Brake boot (MTX) (See CONSOLE REMOVAL/INSTALLATION.)

4. Console panel. (L.H.D. only) (See CONSOLE PANEL REMOVAL/INSTALLATION.)

5. Shift lever knob (MTX) (See SHIFT MECHANISM REMOVAL/INSTALLATION [A26MX-R].)

6. Console (L.H.D. only) (See CONSOLE REMOVAL/INSTALLATION.)

7. Glove compartment. (R.H.D. only) (See GLOVE COMPARTMENT REMOVAL/INSTALLATION.)

3.Set the bonnet release lever out of the way. (L.H.D. only) (See BONNET LATCH AND RELEASE LEVER REMOVAL/INSTALLATION.)

4.Remove the lower panel. (L.H.D. only) (See LOWER PANEL REMOVAL/INSTALLATION.)

5.Remove the BCM with the connector connected. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)

6.Connect the negative battery cable.

7.Measure the voltage at each terminal is as indicated in the Terminal Voltage Tables.

• If the voltage is not as specified in the Terminal Voltage Table, 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)

acxuuw00003687

Terminal	Signal	Connected to	Measurement condition		Voltage (V)	Inspection item (s)
1A	Parking brake switch signal	Parking brake switch	Ignition switch at ON	Parking brake switch on (Parking brake applied)	1.0 or less	• Parking brake switch • Related wiring harnesses
1A	Parking brake switch signal	Parking brake switch	Ignition switch at ON	Parking brake switch off (Parking brake not applied)	B+	• Parking brake switch • Related wiring harnesses
1B ^*1	Bonnet latch switch signal	Bonnet latch switch	Bonnet open		Wave pattern (See Pattern 1.)	• Bonnet latch switch • Related wiring harnesses
1B ^*1	Bonnet latch switch signal	Bonnet latch switch	Bonnet closed		1.0 or less	• Bonnet latch switch • Related wiring harnesses
1C	Brake fluid level signal	Brake fluid level sensor	Ignition switch at ON	Brake fluid level below MIN.	B+	• Brake fluid level sensor • Related wiring harnesses
1C	Brake fluid level signal	Brake fluid level sensor	Ignition switch at ON	Brake fluid level above MIN.	1.0 or less	• Brake fluid level sensor • Related wiring harnesses
1D	CAN_L	CAN system related module	Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.
1E	Oil pressure switch signal	Oil pressure switch	During engine start		B+	• Oil pressure switch • Related wiring harnesses
1E	Oil pressure switch signal	Oil pressure switch	While engine stopped		1.0 or less	• Oil pressure switch • Related wiring harnesses
1F	CAN_H	CAN system related module	Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.
1G	Hazard power supply	HAZARD 10 A fuse	Under any condition		B+	• Related wiring harnesses
1H	—	—	—		—	—
1I	Power door lock power supply	D.LOCK 20 A fuse	Under any condition		B+	• Related wiring harnesses
1J	—	—	—		—	—
1K	Front turn light (RH) control	Front turn light (RH)	Turn switch (RH) on	Front turn light (RH) flashes	Alternates between 1.0 or less and B+	• Front turn light (RH) • Related wiring harnesses
			Hazard warning switch on	Front turn light (RH) flashes	Alternates between 1.0 or less and B+
			Other		1.0 or less
1L	Horn control	Horn relay	Horn sounded		1.0 or less	• Horn relay • Related wiring harnesses
1L	Horn control	Horn relay	Horn not sounded		B+	• Horn relay • Related wiring harnesses
1M	Front turn light (LH) control	Front turn light (LH)	Turn switch (LH) on	Front turn light (LH) flashes	Alternates between 1.0 or less and B+	• Front turn light (LH) • Related wiring harnesses
			Hazard warning switch on	Front turn light (LH) flashes	Alternates between 1.0 or less and B+
			Other		1.0 or less
1N	Rear washer motor control	Rear washer motor	Ignition switch at ON	Rear washer switch on	1.0 or less	• Rear washer motor • Related wiring harnesses
1N	Rear washer motor control	Rear washer motor	Ignition switch at ON	Rear washer switch off	B+	• Rear washer motor • Related wiring harnesses
1P	Rear washer motor power supply	Rear washer motor	Switch the ignition to ON		B+	• Rear washer motor • Related wiring harnesses
1P	Rear washer motor power supply	Rear washer motor	Switch the ignition to Off		1.0 or less	• Rear washer motor • Related wiring harnesses
3A	Ignition key illumination power supply	• Ignition key illumination (without advanced keyless entry and start system) • Steering lock unit (with advanced keyless entry and start system)	Under any condition		B+	• Related wiring harnesses
3B	Key reminder switch power supply	Key reminder switch (without advanced keyless entry and start system)	Under any condition		B+	• Related wiring harnesses
3C	Ignition key illumination control	• Ignition key illumination (without advanced keyless entry and start system) • Steering lock unit (with advanced keyless entry and start system)	Ignition switch off and driver-side door opened.		1.0 or less	• Ignition key illumination bulb • Related wiring harnesses
3C	Ignition key illumination control		15 s or more after all doors closed.		B+
3D	Horn switch signal	Horn switch	Horn switch off		B+	• Horn switch • Related wiring harnesses
3D	Horn switch signal	Horn switch	Horn switch on		1.0 or less	• Horn switch • Related wiring harnesses
3E	Serial communication	• Instrument cluster • Keyless control module (with advanced keyless entry and start system) • Keyless receiver (without advanced keyless entry and start system)	Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.
3F	Key reminder switch signal	• Steering lock unit (with advanced keyless entry and start system) • Key reminder switch (with keyless entry system)	Key inserted		B+	• Steering lock unit (with advanced keyless entry and start system) • Key reminder switch (with keyless entry system) • Related wiring harnesses
3F	Key reminder switch signal		Key removed		1.0 or less
3G	Steering angle sensor GND	Steering angle sensor	Under any condition		1.0 or less	• Related wiring harnesses
3H	—	—	—		—	—
3I	Steering angle sensor signal (Z)	Steering angle sensor	Steering wheel is in center position		0.25—0.75	• Steering angle sensor • Related wiring harnesses
3I	Steering angle sensor signal (Z)	Steering angle sensor	Steering wheel is not in center position		4.00—4.75	• Steering angle sensor • Related wiring harnesses
3J	A/C LIN communication	Climate control unit (with manual air conditioner)	Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.
3K	Steering angle sensor signal (C)	Steering angle sensor	Turn the steering wheel to the left and right.		Alternates between 4.00—4.75 and 0.25—0.75	• Steering angle sensor • Related wiring harnesses
3L	A/C on request signal	Climate control unit (with manual air conditioner)	Ignition switch at ON	A/C on (Fan switch on)	1.0 or less	• Climate control unit (manual air conditioner) • Related wiring harnesses
3L	A/C on request signal	Climate control unit (with manual air conditioner)	Ignition switch at ON	A/C off	Wave pattern (See Pattern 1.)
3M	Steering angle sensor signal (B)	Steering angle sensor	Turn the steering wheel to the left and right.		Alternates between 4.00—4.75 and 0.25—0.75	• Steering angle sensor • Related wiring harnesses
3N	—	—	—		—	—
3O	Steering angle sensor signal (A)	Steering angle sensor	Turn the steering wheel to the left and right.		Alternates between 4.00—4.75 and 0.25—0.75	• Steering angle sensor • Related wiring harnesses
3P	Turn switch input (RH)	Turn switch	Ignition switch at ON	Turn switch at right position	1.0 or less	• Turn switch • Related wiring harnesses
3P	Turn switch input (RH)	Turn switch	Ignition switch at ON	Other	B+	• Turn switch • Related wiring harnesses
3Q	Steering angle sensor power supply	Steering angle sensor	Specified time elapsed since key removal and all doors closed		approx. 2.5	• Steering angle sensor • Related wiring harnesses
3Q	Steering angle sensor power supply	Steering angle sensor	Other		5	• Steering angle sensor • Related wiring harnesses
3R	Turn switch input (LH)	Turn switch	Ignition switch at ON	Turn switch at left position	1.0 or less	• Turn switch • Related wiring harnesses
3R	Turn switch input (LH)	Turn switch	Ignition switch at ON	Other	B+	• Turn switch • Related wiring harnesses
3S	BCM GND	Body ground	Under any condition		1.0 or less	• Related wiring harnesses
3T	Hazard warning switch signal	Hazard warning switch	Hazard warning switch on		1.0 or less	• Hazard warning switch • Related wiring harnesses
3T	Hazard warning switch signal	Hazard warning switch	Hazard warning switch off		Wave pattern (See Pattern 3.)	• Hazard warning switch • Related wiring harnesses
3U	CAN_H	CAN system related module	Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.
3V	Rear wiper switch signal (on)	Windshield wiper and washer switch	Ignition switch at ON	Rear wiper switch at ON position	1.0 or less	• Wiper and washer switch • Related wiring harnesses
3V	Rear wiper switch signal (on)	Windshield wiper and washer switch	Ignition switch at ON	Other	9.35	• Wiper and washer switch • Related wiring harnesses
3W	CAN_L	CAN system related module	Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.
3X	Rear wiper switch signal (INT)	Windshield wiper and washer switch	Ignition switch at ON	Rear wiper switch at INT position	1.0 or less	• Wiper and washer switch • Related wiring harnesses
3X	Rear wiper switch signal (INT)	Windshield wiper and washer switch	Ignition switch at ON	Other	B+	• Wiper and washer switch • Related wiring harnesses
4A	Heated outer mirror power supply	M.DEF 7.5 A fuse	Ignition switch at ON	Rear window defroster switch at ON (Rear window defroster relay on)	B+	• Rear window defroster relay • Related wiring harnesses
4A	Heated outer mirror power supply	M.DEF 7.5 A fuse	Ignition switch at ON	Rear window defroster switch at OFF (Rear window defroster relay off)	1.0 or less	• Rear window defroster relay • Related wiring harnesses
4B	Power supply	ROOM 15 A fuse	Under any condition		B+	• Related wiring harnesses
4C	—	—	—		—	—
4D	Rear wiper and washer power supply	R.WIP 10 A fuse	Ignition switch at ON		B+	• Ignition switch • Rear wiper motor • Related wiring harnesses
4D	Rear wiper and washer power supply	R.WIP 10 A fuse	Ignition switch off		1.0 or less
4E	—	—	—		—	—
4F	Rear washer switch signal	Windshield wiper and washer switch	Ignition switch at ON	Rear washer switch on	1.0 or less	• Windshield wiper and washer switch • Related wiring harnesses
4F	Rear washer switch signal	Windshield wiper and washer switch	Ignition switch at ON	Rear washer switch off	B+
4G	BCM GND	Body ground	Under any condition		1.0 or less	• Related wiring harnesses
4H	—	—	—		—	—
4I	Power supply	METER 15A fuse	Ignition switch at ON		B+	• Ignition switch • Rear wiper motor • Related wiring harnesses
4I	Power supply	METER 15A fuse	Ignition switch off		1.0 or less
5A ^*1	Theft-deterrent siren signal	Theft-deterrent siren	Theft-deterrent system arming	(See Inspection Using an Oscilloscope (Reference).)		• Theft-deterrent siren • Related wiring harnesses
5B	Driver-side door key cylinder switch signal (without double locking system)	Driver-side door key cylinder switch	At the moment key cylinder is unlocked		1.0 or less	• Driver-side door key cylinder switch • Related wiring harnesses
			At the moment key cylinder is locked		2.5
			Other		5
	Driver-side door key cylinder switch signal (with double locking system)	Driver-side door key cylinder switch	At the moment key cylinder is unlocked		1.0 or less	• Driver-side door key cylinder switch • Related wiring harnesses
		Driver-side door key cylinder switch	Other		5
5C	CAN_H	CAN system related module	Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.
5D ^*1	Lock/unlock input (rear door lock-link switch (LH))	Rear door lock-link switch (LH)	Rear door (LH) locked		Wave pattern (See Pattern 1.)	• Rear door lock-link switch (LH) • Related wiring harnesses
5D ^*1	Lock/unlock input (rear door lock-link switch (LH))	Rear door lock-link switch (LH)	Rear door (LH) unlocked		1.0 or less
5E ^*1	Lock/unlock input (rear door lock-link switch (RH))	Rear door lock-link switch (RH)	Rear door (RH) locked		Wave pattern (See Pattern 1.)	• Rear door lock-link switch (RH) • Related wiring harnesses
5E ^*1	Lock/unlock input (rear door lock-link switch (RH))	Rear door lock-link switch (RH)	Rear door (RH) unlocked		1.0 or less
5F	CAN_L	CAN system related module	Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.
5G	Lock input (Driver-side door lock-link switch)	Driver-side door lock-link switch (without advanced keyless entry and start system)	Driver-side door locked		1.0 or less	• Driver-side door lock-link switch • Related wiring harnesses
			Driver-side door unlocked		Wave pattern (See Pattern 1.)
		• Driver-side door lock-link switch • Keyless control module (with advanced keyless entry and start system)	Driver-side door locked		1.0 or less	• Driver-side door lock-link switch • Related wiring harnesses
			Driver-side door unlocked		Wave pattern (See Pattern 2.)
5H ^*1	Lock/unlock input (passenger-side door lock-link switch)	Passenger-side door lock-link switch	Passenger-side door locked		1.0 or less	• Passenger-side door lock-link switch • Related wiring harnesses
5H ^*1	Lock/unlock input (passenger-side door lock-link switch)	Passenger-side door lock-link switch	Passenger-side door unlocked		Wave pattern (See Pattern 1.)
5I	CAN_H	CAN system related module	Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.
5J	Unlock input (Driver-side door lock-link switch)	Driver-side door lock-link switch	Driver-side door locked		Wave pattern (See Pattern 1.)	• Driver-side door lock-link switch • Related wiring harnesses
5J	Unlock input (Driver-side door lock-link switch)	Driver-side door lock-link switch	Driver-side door unlocked		1.0 or less
5K	Lock/unlock signal	Door lock switch (driver-side)	Door lock switch (driver-side) is pressed to lock.		2.5	• Door lock switch (driver-side) • Related wiring harnesses
			Door lock switch (driver-side) is pressed to unlock.		1.0 or less
			Other		5
5L	CAN_L	CAN system related module	Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.
5M ^*1	Intruder sensor GND	Intruder sensor	Under any condition		1.0 or less	• Intruder sensor • Related wiring harnesses
5N	Lock/unlock signal	Door lock switch (passenger-side)	Door lock switch (passenger-side) is pressed to lock.		2.5	• Door lock switch (passenger-side) • Related wiring harnesses
			Door lock switch (passenger-side) is pressed to unlock.		1.0 or less
			Other		5
5O	Rear turn light (RH) control	• Rear turn light (RH) • Front side turn light (with side turn light)	Turn switch (RH) on	Rear turn light (RH) flashes	Alternates between 1.0 or less and B+	• Rear turn light (RH) • Related wiring harnesses
			Hazard warning switch on	Rear turn light (RH) flashes	Alternates between 1.0 or less and B+
			Other		1.0 or less
5P ^*1	Intruder sensor signal	Intruder sensor	Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.
5Q	—	—	—		—	—
5R	Rear turn light (LH) control	• Rear turn light (LH) • Front side turn light (with side turn light)	Turn switch (LH) on	Rear turn light (LH) flashes	Alternates between 1.0 or less and B+	• Rear turn light (LH) • Related wiring harnesses
			Hazard warning switch on	Rear turn light (LH) flashes	Alternates between 1.0 or less and B+
			Other		1.0 or less
5S	Interior light power supply	• Map light • Interior light • Cargo compartment light • Vanity mirror illumination • Position memory control module	Under any condition		B+	• Map light • Interior light • Cargo compartment light • Vanity mirror illumination • Position memory control module • Related wiring harnesses
5T	Liftgate latch switch signal	• Liftgate latch switch • Cargo compartment light	Liftgate is open. (Liftgate latch switch off)		B+	• Liftgate latch switch • Related wiring harnesses
5T	Liftgate latch switch signal	• Liftgate latch switch • Cargo compartment light	Liftgate is closed. (Liftgate latch switch on)		1.0 or less	• Liftgate latch switch • Related wiring harnesses
5U	—	—	—		—	—
5V	Front door switch (passenger-side) signal	Front door switch (passenger-side)	Front door (passenger-side) open (Front door switch (passenger-side) on)		1.0 or less	• Front door switch (passenger-side) • Related wiring harnesses
5V	Front door switch (passenger-side) signal	Front door switch (passenger-side)	Front door (passenger-side) closed (Front door switch (passenger-side) off)		Wave pattern (See Pattern 3.)
5W	Serial communication	• Power window main switch • Sunroof motor • Position memory control module	Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.
5X	Driver-side door key cylinder switch signal (with double locking system)	Driver-side door key cylinder switch	Driver-side key cylinder is in the LOCK position		1.0 or less	• Driver-side door key cylinder switch • Related wiring harnesses
5X		Driver-side door key cylinder switch	Other		Wave pattern (See Pattern 3.)
5Y	Rear door switch (LH) signal	Rear door switch (LH)	Rear door (LH) open (Rear door switch on)		1.0 or less	• Rear door switches • Related wiring harnesses
5Y	Rear door switch (LH) signal	Rear door switch (LH)	Rear door (LH) closed (Rear door switch off)		Wave pattern (See Pattern 3.)	• Rear door switches • Related wiring harnesses
5Z	Rear door switch (RH) signal	Rear door switch (RH)	Rear door (RH) open (Rear door switch on)		1.0 or less	• Rear door switches • Related wiring harnesses
5Z	Rear door switch (RH) signal	Rear door switch (RH)	Rear door (RH) closed (Rear door switch off)		Wave pattern (See Pattern 3.)	• Rear door switches • Related wiring harnesses
5AA	—	—	—		—	—
5AB	Front door switch (driver-side) signal	Front door switch (driver-side)	Front door (driver-side) open (Front door switch (driver-side) on)		1.0 or less	• Front door switch (driver-side) • Position memory control module (with memory power seat) • Related wiring harnesses
		Front door switch (driver-side)	Front door (driver-side) closed (Front door switch (driver-side) off)		Wave pattern (See Pattern 3.)
		• Front door switch (driver-side) • Position memory control module (with memory power seat)	Front door (driver-side) open (Front door switch (driver-side) on)		1.0 or less
			Front door (driver-side) closed (Front door switch (driver-side) off)		Wave pattern (See Pattern 4.)
5AC	Heated outer mirror control	Heated outer mirror (driver-side)	Rear window defroster relay on		B+	• Rear window defroster relay • Heated outer mirror (driver-side) • Related wiring harnesses
5AC	Heated outer mirror control	Heated outer mirror (driver-side)	Rear window defroster relay off		1.0 or less
5AD	Heated outer mirror control	Heated outer mirror (passenger-side)	Rear window defroster relay on		B+	• Rear window defroster relay • Heated outer mirror (passenger-side) • Related wiring harnesses
5AD	Heated outer mirror control	Heated outer mirror (passenger-side)	Rear window defroster relay off		1.0 or less
6A	Rear wiper control	Rear wiper motor	Rear wiper moving		1.0 or less	• Rear wiper motor • Related wiring harnesses
6A	Rear wiper control	Rear wiper motor	Rear wiper stopped		B+	• Rear wiper motor • Related wiring harnesses
6B	Interior light control	• Map light • Interior light	Within 5 min after any door is opened.		1.0 or less	• Map light • Interior light • Related wiring harnesses
			5 min or more after any door is opened.		B+
			All doors closed		B+
6C	• Driver-side door unlock control (with 2stage unlock system) • Double locking system door lock control (with double locking system)	• Driver-side door lock actuator (with 2 stage unlock system) • door lock actuators (with double locking system)	Driver-side door lock actuator unlocking (with 2 stage unlock system)		1.0 or less → B+→ 1.0 or less	• Driver-side door lock actuator (with 2 stage unlock system) • door lock actuators (with double locking system) • Related wiring harnesses
			Double-locking system is adopted (with double locking system)		1.0 or less → B+→ 1.0 or less
			Other		1.0 or less
6D	—	—	—		—	—
6E	Door lock control	Door lock actuators	Door lock actuators unlocking		1.0 or less → B+→ 1.0 or less	• Door lock actuators • Related wiring harnesses
6E	Door lock control	Door lock actuators	Other		1.0 or less	• Door lock actuators • Related wiring harnesses
6F	Door unlock control	Door lock actuators	Door lock actuators locking		1.0 or less → B+→ 1.0 or less	• Door lock actuators • Related wiring harnesses
6F	Door unlock control	Door lock actuators	Other		1.0 or less	• Door lock actuators • Related wiring harnesses

*1:With theft-deterrent system

Generated pulse (reference)

Pattern 1

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• Terminal:

― Bonnet latch switch signal: 1B (+) ↔ body ground (-)

― A/C on request signal: 3L (+) ↔ body ground (-)

― Lock/unlock input (rear door lock-link switch (LH)): 5D (+) ↔ body ground (-)

― Lock/unlock input (rear door lock-link switch (RH)): 5E (+) ↔ body ground (-)

― Lock input (Driver-side door lock-link switch): 5G (+) ↔ body ground (-)

― Lock/unlock input (passenger-side door lock-link switch): 5H (+) ↔ body ground (-)

― Unlock input (Driver-side door lock-link switch): 5J (+) ↔ body ground (-)

• Oscilloscope setting: 2 V/DIV (Y), 1 ms/DIV (X), DC range

Pattern 2

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• Terminal: 5G (+) ↔ 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: 3T (+) ↔ body ground (-)

― Front door switch (passenger-side) signal: 5V (+) ↔ body ground (-)

― Driver-side door key cylinder switch signal (lock): 5X (+) ↔ body ground (-)

― Rear door switch (LH) signal: 5Y (+) ↔ body ground (-)

― Rear door switch (RH) signal: 5Z (+) ↔ body ground (-)

― Front door switch (driver-side) signal: 5AB (+) ↔ body ground (-)

• Oscilloscope setting: 2 V/DIV (Y), 1 ms/DIV (X), DC range

Pattern 4

Note

• A dotted line wave pattern is output for BCM terminal 5AB, however, it appears as a solid line in the oscilloscope where it overlaps the voltage output for terminal 1F from the seat position memory control module.

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• Terminal: 5AB (+) ↔ body ground (-)

• Oscilloscope setting: 2 V/DIV (Y), 1 ms/DIV (X), DC range

Inspection Using an Oscilloscope (Reference)

Intruder sensor signal

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• Terminal connected: 5A (+) ↔ Negative battery terminal

• Oscilloscope setting: 2 V/DIV (Y): 100 ms/DIV (X), DC range

• Measurement condition: Theft-deterrent system arming.