LEMON Manuals: Even more car manuals for everyone
Home >> Mazda >> 2022 >> CX-5 S Select >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Body Control System >> Rear Body Control Module (RBCM) Inspection

Rear Body Control Module (RBCM) Inspection

  1. Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION ).
  2. Remove the following parts:
    1. Trunk board (See TRUNK BOARD REMOVAL/INSTALLATION ).
    2. Bass-box (With Bose ®) (See BASS-BOX REMOVAL/INSTALLATION ).
    3. Sub-trunk (See SUB-TRUNK REMOVAL/INSTALLATION ).
    4. Trunk end trim (See TRUNK END TRIM REMOVAL/INSTALLATION ).
    5. Trunk side trim (LH) (See TRUNK SIDE TRIM REMOVAL/INSTALLATION ).
  3. Remove the rear body control module (RBCM) from the body with the connector connected. (See REAR BODY CONTROL MODULE (RBCM) REMOVAL/INSTALLATION ).
  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).
    • If the voltage is not as indicated in the table, inspect the parts under Inspection item(s).
    • If the system does not launch normally even though inspection items are normal, specify the location of the malfunction based on the instructions from the on-board diagnostic system and the symptom troubleshooting, and perform repairs.

Terminal Voltage Table (Reference) 

G11425913Courtesy of MAZDA
Terminal Signal Connected to Measurement conditions Voltage (V) Inspection item(s)
1A - - - - -
1B Interior light ground
  • Front map light
  • Rear map light
  • Vanity mirror illumination (LH, RH) (1)
 Under any condition 1.0 or less
  • Front map light
  • Rear map light
  • Vanity mirror illumination (LH, RH) (1)
  • Related wiring harness
1C Foot light control
  • Front foot light
  • Rear foot light
 LED ON B+
  • Front foot light
  • Rear foot light
  • Related wiring harness
LED OFF 1.0 or less
1D Console ambient light signal Console ambient light The console ambient light is turned on B+
  • Console ambient light
  • Related wiring harness
The console ambient light is not turned on 1.0 or less
1E Interior light control Front map light Any door is open 1.0 or less
  • Front map light
  • Related wiring harness
Other 5.0
  • Front map light
  • Related wiring harness
1F Interior light power supply
  • Front map light
  • Rear map light
  • Vanity mirror illumination (LH, RH) (1)
 Under any condition B+
  • Front map light
  • Rear map light
  • Vanity mirror illumination (LH, RH) (1)
  • Related wiring harness
1G - - - - -
1H - - - - -
2A - - - - -
2B Power supply
  • Backup power supply (6)
  • D.LOCK 25 A fuse (7)
 Under any condition B+
  • Backup power supply (6)
  • D.LOCK 25 A fuse (7)
  • Related wiring harness
2C Door lock control Door lock actuator Lock driver-side door lock switch from unlock 1.0 or less → B+ → 1.0 or less
  • Door lock actuator
  • Related wiring harness
Unlock driver-side door lock switch from lock 1.0 or less
2D - - - - -
2E Door unlock control Door lock actuator (driver's door) Unlock driver-side door lock switch from lock 1.0 or less → B+ → 1.0 or less
  • Door lock actuator (driver's door)
  • Related wiring harness
Lock driver-side door lock switch from unlock 1.0 or less
2F (2) Theft-deterrent horn relay control Front body control module (FBCM) Connected to M-MDS and using data monitor function, theft-deterrent sound activates 1.0 or less
  • Front body control module (FBCM)
  • Related wiring harness
Connected to M-MDS and using data monitor function, theft-deterrent sound does not activate B+
2G Door unlock control Door lock actuator (except driver's door) Unlock door (except driver's door) lock switch from lock 1.0 or less → B+ → 1.0 or less
  • Door lock actuator (except driver's door)
  • Related wiring harness
Lock door (except driver's door) lock switch from unlock 1.0 or less
2H Brake light control
  • Brake light unit (4)
 Connect the M-MDS and turn on the "STOP_LMP_CS" using the rear body control module (RBCM) simulation function 1.0 or less
  • Brake light unit (4)
  • Related wiring harness
Connect the M-MDS and turn off the "STOP_LMP_CS" using the rear body control module (RBCM) simulation function B+
2I Ignition power supply METER1 10 A fuse Ignition switched ON (engine off) B+
  • METER1 10 A fuse
  • Related wiring harness
Ignition switched OFF (LOCK) 1.0 or less
2J Brake switch signal
  • Start stop unit
  • Brake switch
 Brake pedal depressed B+
  • Start stop unit
  • Brake switch
  • Related wiring harness
Brake pedal not depressed 1.0 or less
2K Power supply STOP 10 A fuse Under any condition B+
  • STOP 10 A fuse
  • Battery
  • Related wiring harness
2L - - - - -
2M Power supply R.WIPER 15 A fuse Under any condition B+
  • R.WIPER 15 A fuse
  • Battery
  • Related wiring harness
2N - - - - -
2O - - - - -
2P Power supply INTERIOR2 15A fuse Under any condition B+
  • INTERIOR2 15A fuse
  • Related wiring harness
3A - - - - -
3B Serial communication Start stop unit Terminal used for communication therefore determination based on terminal voltage is not possible.
3C Fuel sensor ground Fuel gauge sender unit Under any condition 1.0 or less
  • Fuel gauge sender unit
  • Related wiring harness
3D Serial communication Power window main switch Terminal used for communication therefore determination based on terminal voltage is not possible.
3E CAN_H CAN system related module Terminal used for communication therefore determination based on terminal voltage is not possible.
3F Door lock switch signal Door lock switch Door lock switch unlocked 1.0 or less
  • Door lock switch
  • Related wiring harness
Other 4.5
Door lock switch locked 2.2
3G CAN_L CAN system related module Terminal used for communication therefore determination based on terminal voltage is not possible.
3H Driver-side door key cylinder switch signal Door key cylinder switch Door key cylinder is turned to unlock side 1.0 or less
  • Door key cylinder switch
  • Related wiring harness
Other 4.5
Door key cylinder is turned to lock side 2.2
3I Fuel sensor signal Fuel gauge sender unit Inspect the fuel gauge sender unit and related wiring harnesses because the terminal voltage at this terminal cannot be examined.
(See FUEL GAUGE SENDER UNIT INSPECTION [2WD] ).
(See FUEL GAUGE SENDER UNIT INSPECTION [AWD] ).
3J Lock input (lock-link switch (passenger's side, rear door))
  • Door lock-link switch
  • Power liftgate (PLG) control module
 The passenger-side and rear doors are all locked 4.6
  • Door lock-link switch
  • Power liftgate (PLG) control module
  • Related wiring harness
Among the passenger-side and rear doors, at least one door is unlocked 1.0 or less
3K (5) Fuel sensor signal (sub) Fuel gauge sender unit (sub) Inspect the fuel gauge sender unit and related wiring harnesses because the terminal voltage at this terminal cannot be examined.
(See FUEL GAUGE SENDER UNIT INSPECTION [AWD] ).
3L (3) Hood latch switch signal Hood latch switch Hood open (Hood latch switch OFF) 4.6
  • Hood latch switch
  • Related wiring harness
Hood is closed (Hood latch switch ON) 1.0 or less
3M Unlock input (front door lock-link switch (driver's door))
  • Door lock-link switch (driver's door)
  • Power liftgate (PLG) control module (10)
 Driver's door locked B+ (10)
5.0 (11)
  • Door lock-link switch (driver's door)
  • Power liftgate (PLG) control module (10)
  • Related wiring harness
Driver's door unlocked 1.0 or less
3N - - - - -
3O Lock input (front door lock-link switch (driver's door))
  • Door lock-link switch (driver's door)
  • Start stop unit
  • Power liftgate (PLG) control module (10)
 Driver's door locked 1.0 or less
  • Door lock-link switch (driver's door)
  • Start stop unit
  • Power
  • liftgate (PLG) control module (10)
  • Related wiring harness
Driver's door unlocked B+ (10)
5.0 (11)
3P - - - - -
3Q Rear door switch (RH) signal Door latch switch (RR) Rear door(RH)open 1.0 or less
  • Rear door switch (RH)
  • Related wiring harness
Rear door (RH) closed B+
3R Serial communication
  • Telematics communication unit (8)
  • SAS control module (9)
 Terminal used for communication therefore determination based on terminal voltage is not possible.
3S Rear door switch (LH) signal Door latch switch (LR) Rear door (LH) open 1.0 or less
  • Rear door switch (LH)
  • Related wiring harness
Rear door (LH) closed B+
3T Rear seat belt (RH) switch signal Rear buckle switch (RH) Ignition switched ON (engine off) Insert rear seat belt (RH) into buckle B+
  • Rear buckle switch (RH)
  • Related wiring harness
Rear seat belt (RH) not inserted into buckle 1.0 or less
3U Front door switch (passenger's door) signal Door latch switch (passenger's door) Front door (passenger's door) open 1.0 or less
  • Front door switch (passenger's door)
  • Related wiring harness
Front door (passenger's door) closed B+
3V Rear seat belt (center) switch Rear center buckle switch Ignition switched ON (engine off) Insert rear seat belt (center) into buckle B+
  • Rear center buckle switch
  • Related wiring harness
Rear seat belt (center) not inserted into buckle 1.0 or less
3W Front door switch (driver's door) signal Door latch switch (driver's door) Front door (driver's door) open 1.0 or less
  • Front door switch (driver's door)
  • Related wiring harness
Front door (driver's door) closed B+
3X Rear seat belt (LH) switch Rear buckle switch (LH) Ignition switched ON (engine off) Insert rear seat belt (LH) into buckle B+
  • Rear buckle switch (LH)
  • Related wiring harness
Rear seat belt (LH) not inserted into buckle 1.0 or less
4A Rear window wiper motor power supply Rear wiper motor Ignition switched ON (engine off) B+
  • Rear wiper motor
  • Related wiring harness
Ignition switched OFF (LOCK) 1.0 or less
4B Power ground Body ground Under any condition 1.0 or less
  • Related wiring harness
4C Liftgate latch and lock actuator Liftgate latch and lock actuator Press liftgate opener switch B+ → 1.0 or less
  • Liftgate latch and lock actuator
  • Related wiring harness
Except above 1.0 or less
4D Brake light control
  • Brake light unit (4)
  • Brake light relay
 Brake pedal depressed B+
  • Brake light unit (4)
  • Brake light relay
  • Related wiring harness
Brake pedal not depressed 1.0 or less
4E - - - - -
4F Cargo compartment light power supply
  • Cargo compartment light
  • Power liftgate (PLG) control module
  • Power liftgate (PLG) rear switch
 Under any condition B+
  • Cargo compartment light
  • Power liftgate (PLG) control module
  • Power liftgate (PLG) rear switch
  • Related wiring harness
4G - - - - -
4H - - - - -
4I CAN_H CAN system related module Terminal used for communication therefore determination based on terminal voltage is not possible.
4J - - - - -
4K Liftgate latch switch signal
  • Liftgate latch and lock actuator
  • Power liftgate (PLG) control module
  • Power liftgate (PLG) rear switch
  • Liftgate latch switch
 Liftgate open 1.0 or less
  • Liftgate latch and lock actuator
  • Power liftgate (PLG) control module
  • Power liftgate (PLG) rear switch
  • Liftgate latch switch
  • Related wiring harness
Liftgate closed B+
4L CAN_L CAN system related module Terminal used for communication therefore determination based on terminal voltage is not possible.
4M Liftgate opener switch signal
  • Liftgate opener switch
  • Power liftgate (PLG) control module
 Liftgate opener switch pressed 1.0 or less
  • Liftgate opener switch
  • Power liftgate (PLG) control module
  • Related wiring harness
Liftgate opener switch not pressed 4.5
4N - - - - -
4O - - - - -
4P Cargo compartment light control Cargo compartment light Cargo compartment light switch ON Liftgate open 1.0 or less
  • Cargo compartment light
  • Related wiring harness
Liftgate closed B+
4Q - - - - -
4R Signal ground Body ground Under any condition 1.0 or less
  • Related wiring harness
4S Back-up light control
  • Back-up light (LH, RH)
  • Auto dimming rearview mirror
 Ignition switched ON (engine off)
  • Selector lever at R position (AT vehicle)
  • Shift lever at R position (MT vehicle)
 B+
  • Back-up light switch
  • Auto dimming rearview mirror
  • Related wiring harness
Other 1.0 or less
4T Rear wiper motor control (LO) Rear wiper motor Rear wiper switch at ON 1.0 or less
  • Rear wiper motor
  • Related wiring harness
Rear wiper switch at OFF B+
(1) With vanity mirror illumination

(2) With theft-deterrent system

(3) With hood latch switch

(4) With smart brake support (SBS)

(5) AWD vehicles

(6) With backup power supply

(7) Without backup power supply

(8) With telematics communication unit

(9) Without telematics communication unit

(10) With power liftgate (PLG)

(11) Without power liftgate (PLG)
scientia non olet · About LEMON Manuals