BODY CONTROL MODULE (BCM) INSPECTION

id094000800300

1. Remove the front scuff plate inner (LH). (See FRONT SCUFF PLATE REMOVAL/INSTALLATION)

2. Remove the front side trim (LH). (See FRONT SIDE TRIM REMOVAL/INSTALLATION.)

3. Remove the dashboard under cover (Driver side). (L.H.D.) (See DASHBOARD UNDER COVER REMOVAL/INSTALLATION.)

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

5. Remove the BCM with the connector connected.

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

  • If the voltage or continuity 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)

ac9uuw00000703

Terminal | Signal | Connected to | Measurement condition | Voltage (V) | Inspection item (s)
--- | --- | --- | --- | --- | ---
1A | Oil pressure switch signal | Oil pressure switch | Ignition switch at ON | When the engine is running (oil pressure switch on) | 1.0 or less | • Oil pressure switch • Related wiring harnesses
When the engine is not running (oil pressure switch off) | B+
1B*1 | Bonnet latch switch signal | Bonnet latch switch | Bonnet open (Bonnet latch switch off) | Wave pattern (See Pattern 2.) | • Bonnet latch switch • Related wiring harnesses
Bonnet closed (Bonnet latch switch on) | 1.0 or less
1C*2, *14 | Washer level signal | Washer fluid-level sensor | Ignition switch at ON | Washer level below MIN. | 1.0 or less | • Washer fluid-level sensor • Related wiring harnesses
Washer level above MIN. | B+
1D | Brake fluid level signal | Brake fluid level sensor | Ignition switch at ON | Brake fluid level below MIN. | 1.0 or less | • Brake fluid level sensor • Related wiring harnesses
Brake fluid level above MIN. | B+
1E*1 | Lock/unlock input (passenger-side door lock-link switch) | • Passenger-side door lock-link switch • PLG control module*3 | Passenger-side door locked | With PLG system Wave pattern (See Pattern 5.) | • Passenger-side door lock-link switch • PLG control module*3 • Related wiring harnesses
Without PLG system Wave pattern (See Pattern 1.)
Passenger-side door unlocked | 1.0 or less
1F | Front turn light (LH) control | • Front turn light (LH) • Front side turn turn light (LH)*15 | Turn switch (LH) on | Front turn light (LH) flashes | Alternates between 1.0 or less and B+ | • Front turn light (LH) • Front side turn turn light (LH)*15 • Related wiring harnesses
Hazard warning switch on
Other | 1.0 or less
1G | 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
Other | 1.0 or less
1H | Lock/unlock signal | Door lock switch (passenger side) | Door lock switch (passenger side) is pressed to lock. | approx. 2.2 | • Door lock switch (passenger side) • Related wiring harnesses
Door lock switch (passenger side) is pressed to unlock. | 1.0 or less
Other | approx. 4.6
1I | Front side turn turn light (RH) control | Front side turn turn light (RH) | Turn switch (RH) on | Front side turn turn light (RH) flashes | Alternates between 1.0 or less and B+ | • Front side turn light (RH) • Related wiring harnesses
Hazard warning switch on
Other | 1.0 or less
1J*14 | CAN_L | CAN system related module | Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.
1K | Parking brake switch signal | Parking brake switch | Ignition switch at ON | Parking brake switch on | 1.0 or less | • Parking brake switch • Related wiring harnesses
Parking brake switch off | B+
1L*14 | CAN_H | CAN system related module | Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.
1M | Back-up light power supply | Back-up light relay | Ignition switch at ON | The selector lever is in the R position | B+ | • Back-up light relay • Back-up light • Related wiring harnesses
Other | 1.0 or less
1N | Power supply | • Air intake actuator • Front blower relay • Rear blower relay • Rear window defroster relay | Ignition switch at ON | B+ | • Air intake actuator • Front blower relay • Rear blower relay • Rear window defroster relay • Related wiring harnesses
Ignition switch off | 1.0 or less
1O | Horn control | Horn relay | Transmitter LOCK button is pressed twice within 5 s. | B+→ 1.0 or less → B+ | • Horn relay • Related wiring harnesses
Other | B+
1P | ACC | ACC relay | Ignition switch at ACC | B+ | • ACC relay • Ignition switch • Related wiring harnesses
Ignition switch off | 1.0 or less
2A | Interior light power supply | ROOM 15A fuse | Under any condition | B+ | • ROOM 15A fuse • Related wiring harnesses
2B | Hazard power supply | HAZARD 15A fuse | Under any condition | B+ | • HAZARD 15A fuse • Related wiring harnesses
2C | Courtesy light power supply | Courtesy light (RH) | Under any condition | B+ | • Courtesy light (RH) • Related wiring harnesses
2D | Rear washer motor power supply | Rear washer motor | Ignition switch at ON | B+ | • Ignition switch • Rear washer motor • Related wiring harnesses
Ignition switch off | 1.0 or less
2E | Courtesy light (RH) control | Courtesy light (RH) | Courtesy light on by opening any door | Courtesy light off by closing all doors | Wave pattern (See Pattern 4.) | • Courtesy light (RH) • Related wiring harnesses
2F | Power supply | • Back-up light relay • TCM | Ignition switch at ON | B+ | • Back-up light relay • TCM • Related wiring harnesses
Ignition switch off | 1.0 or less
2G | Signal GND | Body ground | Under any condition | 1.0 or less | • Related wiring harnesses
2H | Door lock control (passenger side) | Door lock actuator | Door lock actuator locking | 1.0 or less → B+→ 1.0 or less | • Door lock actuator (passenger side) • Related wiring harnesses
Other | 1.0 or less
2I*4 | Light control | Rear fog light relay | Light switch at TNS | B+ | • Rear fog light relay • Related wiring harnesses
Light switch off | 1.0 or less
2J | — | — | — | — | —
2K | Light control | Parking light | Light switch at TNS | B+ | • Parking light • Related wiring harnesses
Light switch off | 1.0 or less
2L | Door unlock control (passenger side) | Door lock actuator | Door lock actuator unlocking | 1.0 or less → B+→ 1.0 or less | • Door lock actuator (passenger side) • Related wiring harnesses
Other | 1.0 or less
2M | IG1 | DSC/RSC HU/CM | Ignition switch at ON | B+ | • DSC/RSC HU/CM • Related wiring harnesses
Ignition switch off | 1.0 or less
2N | Power GND | Body ground | Under any condition | 1.0 or less | • Related wiring harnesses
2O | 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
Rear washer switch off | B+
2P | Power door lock power supply | D/L 25A fuse | Under any condition | B+ | • D/L 25A fuse • Related wiring harnesses
3A | Parking brake switch output signal | Audio unit / car-navigation unit | Ignition switch at ON | Parking brake switch on | 1.0 or less | • Audio unit / car-navigation unit • Related wiring harnesses
Parking brake switch off | B+
3B | Serial communication | • Keyless control module*6 • Keyless receiver*12 • Auto light / wiper control module*13 | Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.
3C | — | — | — | — | —
3D | Turn switch input (LH) | Turn switch | Ignition switch at ON | Turn switch at left position | 1.0 or less | • Turn switch • Related wiring harnesses
Other | B+
3E | Driver-side door key cylinder switch signal | 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 | approx. 2.1
Other | approx. 4.6
3F | — | — | — | — | —
3G | Turn switch input (RH) | Turn switch | Ignition switch at ON | Turn switch at right position | 1.0 or less | • Turn switch • Related wiring harnesses
Other | B+
3H | — | — | — | — | —
3I | — | — | — | — | —
3J | Serial communication | Power window main switch | Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.
3K*5 | Serial communication | Sunroof motor | Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.
3L | — | — | — | — | —
3M*1 | Security light control | • Instrument cluster • Theft-deterrent system | Security light on | 1.0 or less | • Instrument cluster • Theft-deterrent system • Related wiring harnesses
Security light off | B+
3N | Steering angle sensor GND | Steering angle sensor | Under any condition | 1.0 or less | • Related wiring harnesses
3O | — | — | — | — | —
3P | Rear wiper switch signal (on) | Rear wiper and washer switch | Ignition switch at ON | Rear wiper switch at ON position | 1.0 or less | • Rear wiper and washer switch • Related wiring harnesses
Other | B+
3Q | Rear wiper switch signal (INT) | Rear windshield wiper and washer switch | Ignition switch at ON | Rear wiper switch at INT position | 1.0 or less | • Rear wiper and washer switch • Related wiring harnesses
Other | B+
3R | Lock/unlock signal | Door lock switch (driver side) | Door lock switch (driver side) is pressed to lock. | approx. 2.1 | • Door lock switch (driver-side) • Related wiring harnesses
Door lock switch (driver side) is pressed to unlock. | 1.0 or less
Other | approx. 4.6
3S | 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 | • Related wiring harnesses
3T | 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 | • Related wiring harnesses
3U | Horn switch signal | • Horn switch • Clock spring | Horn switch off | B+ | • Horn switch • Clock spring • Related wiring harnesses
Horn switch on | 1.0 or less
3V | Steering angle sensor power supply | Steering angle sensor | Fifteen hours after key removed and all doors closed. | Wave pattern (See Pattern 3.) | • Steering angle sensor • Related wiring harnesses
Other | approx. 5
3W | 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 | • Related wiring harnesses
3X | Steering angle sensor signal (Z) | Steering angle sensor | Turn the steering wheel to the left and right. | Alternates between 4.00—4.75 and 0.25—0.75 | • Related wiring harnesses
3Y*14 | Front side turn turn light (LH) control | Front side turn turn light (LH) | Turn switch (LH) on | Front side turn turn light (LH) flashes | Alternates between 1.0 or less and B+ | • Front side turn light (LH) • Related wiring harnesses
Hazard warning switch on
Other | 1.0 or less
3Z | CAN_L | CAN system related module | Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.
3AA | CAN_H | CAN system related module | Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.
3AB | Ignition key illumination control | • Steering lock unit*6 • Ignition key illumination*12 | Ignition switch off and driver-side door opened. | 1.0 or less | • Steering lock unit*6 • Ignition key illumination*12 • Ignition key illumination bulb • Related wiring harnesses
15 s or more after all doors closed. | B+
3AC*6, *14 | CAN_L | CAN system related module | Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.
3AD*6, *14 | CAN_H | CAN system related module | Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.
4A | BCM power supply | METER 10 A fuse | Under any condition | B+ | • METER 10 A fuse • Related wiring harnesses
4B | Courtesy light (LH) control | Courtesy light (LH) | Courtesy light on by opening any door | Courtesy light off by closing all doors | Wave pattern (See Pattern 4.) | • Courtesy light (LH) • Related wiring harnesses
4C | — | — | — | — | —
4D | IG1 | SAS 7.5 A fuse | Ignition switch at ON | B+ | • SAS 7.5 A fuse • Related wiring harnesses
Ignition switch off | 1.0 or less
4E | TNS signal | • TNS relay • TAIL 10 A fuse | Light switch at TNS position | B+ | • TNS relay • TAIL 10A fuse • Related wiring harnesses
Light switch off | 1.0 or less
4F | ACC | MIRROR 7.5 A fuse | Ignition switch at ACC | B+ | • MIRROR 7.5 A fuse • Related wiring harnesses
Ignition switch off | 1.0 or less
5A | IG2 | R.WIPER 15A fuse | Ignition switch at ON | B+ | • R.WIPER 15A fuse • Related wiring harnesses
Ignition switch off | 1.0 or less
5B | — | — | — | — | —
5C | — | — | — | — | —
5D | Power supply | • Keyless control module*6 • Keyless receiver, key reminder switch, ignition key illumination*12 | Under any condition | B+ | • Keyless control module*6 • Keyless receiver, key reminder switch, ignition key illumination*12 • Related wiring harnesses
5E | Door unlock control (driver side) | Door lock actuator | Door lock actuator unlocking | 1.0 or less → B+→ 1.0 or less | • Door lock actuator (driver side) • Related wiring harnesses
Other | 1.0 or less
5F | Power supply | • Audio unit • Auto light/wiper control module | Under any condition | B+ | • Bluetooth unit • Auto light/wiper control module • Related wiring harnesses
5G | — | — | — | — | —
5H | Interior light power supply | • Courtesy light (LH) • Front climate control module • Information control module • Instrument cluster | Under any condition | B+ | • Courtesy light (LH) • Interior light • Courtesy light (LH) • Front climate control module • Information control module • Instrument cluster • Related wiring harnesses
5I | Door lock control (driver side) | Door lock actuator | Door lock actuator locking | 1.0 or less → B+→ 1.0 or less | • Door lock actuator (driver side) • Related wiring harnesses
Other | 1.0 or less
5J | Back-up light signal | Audio unit | Ignition switch at ON | The selector lever is in the R position | B+ | • Audio unit • Related wiring harnesses
Other | 1.0 or less
5K | Unlock input (Driver-side door lock-link switch) | Driver-side door lock-link switch | Driver-side door locked | Wave pattern (See Pattern 2.) | • Driver-side door lock-link switch • Related wiring harnesses
Driver-side door unlocked | 1.0 or less
5L | IG2 | A/C 7.5 A fuse | Ignition switch at ON | B+ | • A/C 7.5 A fuse • Battery • Related wiring harnesses
Ignition switch off | 1.0 or less
5M | Hazard warning switch signal | • Hazard warning switch • Theft-deterrent control module*1 | Hazard warning switch on | 1.0 or less | • Hazard warning switch • Theft-deterrent control module*1 • Related wiring harnesses
Hazard warning switch off | approx. 4.6
5N | Lock input (Driver-side door lock-link switch)*12 | Driver-side door lock-link switch | 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.)
Lock input (Driver-side door lock-link switch)*6 | • Driver-side door lock-link switch • Keyless control module | Driver-side door locked | 1.0 or less | • Driver-side door lock-link switch • Keyless control module • Related wiring harnesses
Driver-side door unlocked | approx. 4.6
5O | Rear washer switch signal | Rear wiper and washer switch | Ignition switch at ON | Rear washer switch on | 1.0 or less | • Rear wiper and washer switch • Related wiring harnesses
Rear washer switch off | B+
5P | Key reminder switch signal | • Steering lock unit*6 • Key reminder switch*12 | Key inserted | B+ | • Steering lock unit*6 • Key reminder switch*12 • Related wiring harnesses
Key removed | 1.0 or less
6A | 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 harnesses
Hazard warning switch on
Other | 1.0 or less
6B | Light control | Taillight (RH) | Light switch at TNS position | B+ | • TNS relay • BCM • Related wiring harnesses
Light switch off | 1.0 or less
6C | 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 harnesses
Hazard warning switch on
Other | 1.0 or less
6D | Light control | • Taillight (LH) • License plate light | Light switch at TNS position | B+ | • TNS relay • BCM • Related wiring harnesses
Light switch off | 1.0 or less
6E | — | — | — | — | —
6F | — | — | — | — | —
6G | CAN_L | CAN system related module | Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.
6H*7 | CAN_L | CAN system related module | Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.
6I | CAN_H | CAN system related module | Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.
6J*7 | CAN_H | CAN system related module | Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.
6K | — | — | — | — | —
6L*9, *15 | ACC | Position memory control module | Ignition switch at ACC | B+ | • Position memory control module • Related wiring harnesses
Ignition switch off | 1.0 or less
6M | 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
Front door (passenger side) closed (Front door switch (passenger side) off) | B+
6N*8 | IG2 | Seat warmer unit | Ignition switch at ON | B+ | • Seat warmer unit • Related wiring harnesses
Ignition switch off | 1.0 or less
6O | Front door switch (driver side) input 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) • Related wiring harnesses
Front door (driver side) closed (Front door switch (driver side) off) | B+
6P | — | — | — | — | —
6Q | Rear door switch (RH) signal | Rear door switch (RH) | Any rear doors open (Rear door switch on) | 1.0 or less | • Rear door switches • Related wiring harnesses
All rear doors closed (Rear door switch off) | B+
6R | Rear door switch (LH) signal | Rear door switch (LH) | Any rear doors open (Rear door switch on) | 1.0 or less | • Rear door switches • Related wiring harnesses
All rear doors closed (Rear door switch off) | B+
6S | Liftgate latch switch signal | • Liftgate latch switch • PLG control module*3 | Liftgate is open. (Liftgate latch switch on) | 1.0 or less | • Liftgate latch switch • PLG control module*3 • Related wiring harnesses
Liftgate is closed. (Liftgate latch switch off) | B+
6T*9 | Position memory control module communication | Position memory control module | Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.
6U*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
Rear door (LH) unlocked | 1.0 or less
6V | Back-up light control | • Back-up light • Parking sensor control module*10 | Ignition switch at ON | The selector lever is in the R position | B+ | • Back-up light relay • Back-up light • Parking sensor control module*10 • Related wiring harnesses
Other | 1.0 or less
6W*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
Rear door (RH) unlocked | 1.0 or less
6X | — | — | — | — | —
7A | Rear wiper control | Rear wiper motor | Ignition switch at ON | Rear wiper moving | 1.0 or less | • Rear wiper motor • Related wiring harnesses
Rear wiper stopped | B+
7B | Power supply | • 4WD control module*7 • Parking sensor control module*10 • Position memory control module*9 • BSM control module (LH, RH)*11 | Ignition switch at ON | B+ | • 4WD control module*7 • Parking sensor control module*10 • Position memory control module*9 • BSM control module (LH, RH)*11 • Related wiring harnesses
Ignition switch off | 1.0 or less
7D | Door lock control | Door lock actuators | Press the lock button on the door lock switch. | 1.0 or less → B+→ 1.0 or less | • Door lock actuators • Related wiring harnesses
Other | 1.0 or less
7F | Rear wiper power supply | Rear wiper motor | Ignition switch at ON | B+ | • Ignition switch • Rear wiper motor • Related wiring harnesses
Ignition switch off | 1.0 or less
7G | Door unlock control | Door lock actuators | Press the lock button on the door lock switch. | 1.0 or less → B+→ 1.0 or less | • Door lock actuators • Related wiring harnesses
Other | 1.0 or less
7H*9 | Position memory control power supply | Position memory control module | Under any condition | B+ | • Position memory control module • Related wiring harnesses
7I | Interior light control | Front map light | Interior light on by opening any door | Interior light off by closing all doors | Wave pattern (See Pattern 4.) | • Front map light • Related wiring harnesses
7J | Interior light power supply | • Front map light • Interior light • Cargo compartment light • Theft-deterrent siren • PLG control module*3 | Under any condition | B+ | • Front map light • Interior light • Cargo compartment light • Theft-deterrent siren • PLG control module*3 • Related wiring harnesses

*1 :With theft-deterrent system
*2 :With washer fluid-level sensor
*3 :With PLG system
*4 :With rear fog light
*5 :With sunroof system
*6 :With advanced keyless entry and start system
*7 :With 4WD
*8 :With seat warmer
*9 :With memory power seat
*10 :With parking sensor
*11 :With BSM system
*12 :Without advanced keyless entry and start system
*13 :With auto wiper system
*14 :L.H.D.
*15 :R.H.D.

Generated pulse (reference)

Pattern 1

ac9uuw00003072

  • Terminal:
    ― Lock/unlock input (passenger-side door lock-link switch): 1E (+) ↔ body ground (-)
    ― Lock/unlock input (rear door lock-link switch (LH)): 6U (+) ↔ body ground (-)
    ― Lock/unlock input (rear door lock-link switch (RH): 6W (+) ↔ body ground (-)
  • Oscilloscope setting: 1 V/DIV (Y), 1 ms/DIV (X), DC range

Pattern 2

ac9uuw00003073

  • Terminal:
    ― Bonnet latch switch signal: 1B (+) ↔ body ground (-)
    ― Unlock input (Driver-side door lock-link switch): 5K (+) ↔ body ground (-)
    ― Lock input (Driver-side door lock-link switch): 5N (+) ↔ body ground (-)
  • Oscilloscope setting: 1 V/DIV (Y), 1 ms/DIV (X), DC range

Pattern 3

ac9uuw00003074

  • Terminal: 3V (+) ↔ body ground (-)
  • Oscilloscope setting: 1 V/DIV (Y), 200 µs/DIV (X), DC range

Pattern 4

ac9uuw00003075

  • Terminal:
    ― Courtesy light (LH) control: 2E (+) ↔ body ground (-)
    ― Courtesy light (RH) control: 4B (+) ↔ body ground (-)
    ― Interior light control: 7I (+) ↔ body ground (-)
  • Oscilloscope setting: 5 V/DIV (Y), 5 ms/DIV (X), DC range

Pattern 5

ac9wzw00001453

  • Terminal:
    ― Lock/unlock input (passenger-side door lock-link switch): 1E (+) ↔ body ground (-)
  • Oscilloscope setting: 2 V/DIV (Y), 1 ms/DIV (X), DC range