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Mazda CX-5 Service & Repair Manual: Rear Body Control Module (Rbcm) Inspection

Mazda CX-5 Service & Repair Manual / Electrical / Data Network / Rear Body Control Module (Rbcm) Inspection

1. Disconnect the negative battery cable..

2. Remove the following parts:

a. Trunk board.

b. Trunk end trim.

c. Rear scuff plate (LH).

d. Trunk side trim (LH).

3. Remove the rear body control module (RBCM) from the body with the connector connected..

4. Connect the negative battery cable..

5. Verify that the voltages of each of the terminals are as indicated in the Terminal Voltage Table (Reference).

Terminal Voltage Table (Reference)



Terminal

Signal

Connected to

Measurement conditions

Voltage (V)

Inspection item(s)

1A

1B

Interior light ground

  • Map light

  • Vanity mirror illumination

Under any condition

1.0 or less

  • Map light

  • Vanity mirror illumination

  • Related wiring harness

1C

1D

1E

Interior light control

Map light

Under any condition

1.0 or less

  • Map light

  • Related wiring harness

1F

1G

1H

Interior light power supply

Map light

Under any condition

B+

  • Map light

  • Related wiring harness

2A

2B

Power supply

D.LOCK 25 A fuse

Under any condition

B+

  • D.LOCK 25 A fuse

  • 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

Unock driver-side door lock switch from lock

1.0 or less > B+ > 1.0 or less

  • Door lock actuator

  • Related wiring harness

Lock driver-side door lock switch from unlock

1.0 or less

2F*1

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*2

2-stage unlock system control

Door lock actuator

Press transmitter unlock button two times (2-stage unlock system operation condition)

B+ > 1.0 or less

  • Door lock actuator

  • Related wiring harness

Except above

1.0 or less

2H

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

2K

2L

2M

Power supply

R.WIPER 15 A fuse

Under any condition

B+

  • R.WIPER 15 A fuse

  • Related wiring harness

2N

2O

2P

Power supply

ROOM 15 A fuse

Under any condition

B+

  • ROOM 15 A 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

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

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

The passenger-side and rear doors are all locked

4.6

  • Door lock-link switch

  • Related wiring harness

Among the passenger-side and rear doors, at least one door is unlocked

1.0 or less

3K*3

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

Bonnet latch switch signal

Hood latch switch

Hood open

(bonnet latch switch OFF)

4.6

  • Hood latch switch

  • Related wiring harness

Hood is closed

(bonnet 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)

Driver's door locked

4.6

  • Door lock-link switch (driver's door)

  • 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)

Driver's door locked

1.0 or less

  • Door lock-link switch (driver's door)

  • Related wiring harness

Driver's door unlocked

4.6

3P

3Q

Rear door switch (RH) signal

Rear door switch (RH)

Rear door (RH) open

1.0 or less

  • Rear door switch (RH)

  • Related wiring harness

Rear door (RH) closed

B+

3R

3S

Rear door switch (LH) signal

Rear door switch (LH)

Rear door (LH) open

1.0 or less

  • Rear door switch (LH)

  • Related wiring harness

Rear door (LH) closed

B+

3T

3U

Front door switch (passenger's door) signal

Front door 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

3W

Front door switch (driver's door) signal

Front door 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

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 lock actuator control

Liftgate lock actuator

Press liftgate opener switch

B+ > 1.0 or less

  • Liftgate lock actuator

  • Related wiring harness

Except above

1.0 or less

4D

Brake light control

  • Brake light

  • High-mount brake light

Brake pedal depressed

B+

  • Brake light

  • High-mount brake light

  • Related wiring harness

Brake pedal not depressed

1.0 or less

4E

4F

Cargo compartment light power supply

Cargo compartment light

Under any condition

B+

  • Cargo compartment light

  • Related wiring harness

4G

CAN_H

CAN system related module

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

4H

4I

CAN_H

CAN system related module

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

4J

CAN_L

CAN system related module

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

4K

Liftgate latch switch signal

Cargo compartment light switch

Liftgate open

1.0 or less

  • Cargo compartment light 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

Liftgate opener switch pressed

1.0 or less

  • Liftgate opener switch

  • Related wiring harness

Liftgate opener switch not pressed

4.5

4N

4O

4P

Cargo compartment light control

Cargo compartment light

Cargo compartment light switched 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 mirror

Ignition switched ON (engine off)

  • Selector lever at R position (AT vehicle)

  • Shift lever at R position (MT vehicle)

B+

  • Back-up light (LH, RH)

  • Auto dimming 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 Vehicles with theft-deterrent system

*2 Vehicles with 2-stage unlock system

*3 AWD vehicles

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