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Mazda CX-5 Service & Repair Manual: Front Body Control Module (Fbcm) Inspection

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

1. Remove the fuse box cover..

2. Remove the front body control module (FBCM) from the fuse box..

3. 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

Power supply

HAZARD 25 A fuse

Under any condition

B+

  • HAZARD 25 A fuse

  • Related wiring harness

1B

Power supply

HAZARD 25 A fuse

Under any condition

B+

  • HAZARD 25 A fuse

  • Related wiring harness

1C

Ignition power supply

  • Climate control unit

  • A/C relay

  • Seat warmer control unit

Ignition switched ON (engine off)

B+

  • Climate control unit

  • A/C relay

  • Seat warmer control unit

  • Related wiring harness

Ignition switched OFF (LOCK)

1.0 or less

1D

Signal ground

Body ground

Under any condition

1.0 or less

  • Related wiring harness

1E

Rear turn light (RH) control

Rear turn light (RH)

Ignition switched ON (engine off)

Turn switch at right turn light position

1.0 or less ? B+

  • Rear turn light (RH)

  • Related wiring harness

Turn switch is in position other than above

1.0 or less

1F

Side turn light (RH) control

Side turn light (RH)

Ignition switched ON (engine off)

Turn switch at right turn light position

1.0 or less ? B+

  • Side turn light (RH)

  • Related wiring harness

Turn switch is in position other than above

1.0 or less

1G

Front turn light (RH) control

Front turn light (RH)

Ignition switched ON (engine off)

Turn switch at right turn light position

1.0 or less ? B+

  • Front turn light (RH)

  • Related wiring harness

Turn switch is in position other than above

1.0 or less

1H

1I

License light control

TNS relay

Light switch at TNS position

B+

  • TNS relay

  • Related wiring harness

Light switch at OFF position

1.0 or less

1J

Parking light control

Parking light (RH, LH)

Light switch at TNS position

B+

  • Parking light (RH, LH)

  • Related wiring harness

Light switch at OFF position

1.0 or less

1K

1L

Horn relay control

Horn relay

Horn switch not pressed

B+

  • Horn relay

  • Related wiring harness

Horn switch pressed

1.0 or less

1M

Headlight relay (LO) control

Headlight relay (LO)

Light switch at HEAD position

1.0 or less

  • Headlight relay (LO)

  • Related wiring harness

Light switch is in position other than above

B+

1N

1O*1

Theft-deterrent horn input signal

Rear body control module (RBCM)

Connect the M-MDS and turn on the "BG_HORN_RLY" using the rear body control module (RBCM) simulation function.

1.0 or less

  • Rear body control module (RBCM)

  • Related wiring harness

Connect the M-MDS and turn off the "BG_HORN_RLY" using the rear body control module (RBCM) simulation function.

B+

1P

Rear window defroster relay control

Rear window defroster relay

Ignition switched ON (engine off)

Rear window defroster switch OFF

B+

  • Rear window defroster relay

  • Related wiring harness

Rear window defroster switch ON

1.0 or less

1Q

1R*1

Theft-deterrent horn power supply

R.WIPER 15 A fuse

Under any condition

B+

  • R.WIPER 15 A fuse

  • Related wiring harness

1S

1T*1

Theft-deterrent horn output signal

Theft-deterrent horn

M-MDS is connected and theft-deterrent is sounded using data monitor function

B+

  • Theft-deterrent horn

  • Related wiring harness

M-MDS is connected and theft-deterrent is not sounded using data monitor function

1.0 or less

2A

Interior light power supply

ROOM 15 A fuse

Under any condition

B+

  • ROOM 15 A fuse

  • Related wiring harness

2B

Front turn light (LH) control

Front turn light (LH)

Ignition switched ON (engine off)

Turn switch at left turn light position

1.0 or less ? B+

  • Front turn light (LH)

  • Related wiring harness

Turn switch is in position other than above

1.0 or less

2C*2

Daytime running light control

DRL relay

Ignition switched ON (engine off) and light switch OFF

Daytime running light illuminates

B+

  • DRL relay

  • Related wiring harness

Daytime running light turns off

1.0 or less

2D

Rear turn light (LH) control

Rear turn light (LH)

Ignition switched ON (engine off)

Turn switch at left turn light position

1.0 or less ? B+

  • Rear turn light (LH)

  • Related wiring harness

Turn switch is in position other than above

1.0 or less

2E

2F

Side turn light (LH) control

Side turn light (LH)

Ignition switched ON (engine off)

Turn switch at left turn light position

1.0 or less ? B+

  • Side turn light (LH)

  • Related wiring harness

Turn switch is in position other than above

1.0 or less

2G*3

LIN communication

Rain sensor/auto-light sensor

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

2H

2I

CAN_L

CAN system related module

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

2J

LIN communication

Climate control unit

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

2K

CAN_H

CAN system related module

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

2L

CAN_L

AFS control module

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

2M

Ignition power supply

C/U IG1 15 A fuse

Ignition switched ON (engine off)

B+

  • C/U IG1 15 A fuse

  • Related wiring harness

Ignition switched OFF (LOCK)

1.0 or less

2N

CAN_L

CAN system related module

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

2O

2P

CAN_H

CAN system related module

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

2Q

Brake fluid level switch signal

Brake fluid level sensor

Ignition switched ON (engine off)

Brake fluid level is less than MIN (brake fluid level sensor ON)

1.0 or less

  • Brake fluid level sensor

  • Related wiring harness

Brake fluid level is MIN or more (brake fluid level sensor OFF)

Wave pattern.

2R

CAN_H

CAN system related module

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

2S

Washer level switch signal

Washer fluid-level sensor

Ignition switched ON (engine off)

Washer level is less than MIN (washer fluid-level sensor ON)

1.0 or less

  • Washer fluid-level sensor

  • Related wiring harness

Washer level is MIN or more (washer fluid-level sensor OFF)

Wave pattern.

2T

2U

Ignition power supply

Start stop unit

Ignition switched ON (engine off)

B+

  • Start stop unit

  • Related wiring harness

Ignition switched OFF (LOCK)

1.0 or less

2V

Headlight relay (LO) control (discharge type)

Headlight relay (LO)

Light switch at HEAD position

1.0 or less

  • Headlight relay (LO)

  • Related wiring harness

Light switch is in position other than above

B+

2W

Headlight (LO) switch signal

Start stop unit

Light switch at HEAD position

1.0 or less

  • Start stop unit

  • Related wiring harness

Light switch at OFF position

B+

2X

Headlight relay (HI) control

Headlight relay (HI)

Headlight at HEAD position and dimmer switch at LO position

B+

  • Headlight relay (HI)

  • Related wiring harness

Headlight at HEAD position and dimmer switch at HIGH or passing position

1.0 or less

2Y

Windshield wiper (LO) switch signal

Start stop unit

Windshield wiper switch at ON position

1.0 or less

  • Start stop unit

  • Related wiring harness

Windshield wiper switch at OFF position

B+

2Z

Blower motor relay control

Blower relay

Ignition switched ON (engine off)

Operate blower motor using fan switch

1.0 or less

  • Blower relay

  • Related wiring harness

Press climate control unit OFF button to stop blower motor

B+

2AA

Autostop switch signal

Windshield wiper motor

Ignition switched ON (engine off)

Turn windshield wiper switch ON and wiper is operated

B+

  • Windshield wiper motor

  • Related wiring harness

Windshield wiper switch OFF

1.0 or less

2AB*4

Front fog light relay control

Front fog light relay

Light switch at HEAD position

Front fog light switch OFF

B+

  • Front fog light relay

  • Related wiring harness

Front fog light switch ON

1.0 or less

3A

Wiper power supply

WIPER 20 A fuse

Under any condition

B+

  • WIPER 20 A fuse

  • Related wiring harness

3B

Wiper power supply

WIPER 20 A fuse

Under any condition

B+

  • WIPER 20 A fuse

  • Related wiring harness

3C

Windshield wiper motor (HI) control

Windshield wiper motor

Ignition switched ON (engine off)

Windshield wiper switch at HI position

B+

  • Windshield wiper motor

  • Related wiring harness

Windshield wiper switch at OFF position

1.0 or less

3D

Power ground

Body ground

Under any condition

1.0 or less

  • Related wiring harness

3E

Windshield wiper motor (HI) control

Windshield wiper motor

Ignition switched ON (engine off)

Windshield wiper switch at HI position

B+

  • Windshield wiper motor

  • Related wiring harness

Windshield wiper switch at OFF position

1.0 or less

3F

Windshield washer motor control

Washer motor

Ignition switched ON (engine off)

Windshield washer switch ON

B+

  • Washer motor

  • Related wiring harness

Windshield washer switch OFF

1.0 or less

3G

Windshield wiper motor (LOW) control

Windshield wiper motor

Ignition switched ON (engine off)

Windshield wiper switch at LOW position

B+

  • Windshield wiper motor

  • Related wiring harness

Windshield wiper switch at OFF position

1.0 or less

3H

Rear window washer motor control

Washer motor

Ignition switched ON (engine off)

Rear window washer switch ON

B+

  • Washer motor

  • Related wiring harness

Rear washer switch OFF

1.0 or less

3I

Windshield wiper motor (LOW) control

Windshield wiper motor

Ignition switched ON (engine off)

Windshield wiper switch at LOW position

B+

  • Windshield wiper motor

  • Related wiring harness

Windshield wiper switch at OFF position

1.0 or less

3J

Interior illumination power supply

  • Selector illumination

  • Climate control unit (vehicles with manual air conditioner system)

  • Audio unit

  • Clock spring

Light switch at TNS position

B+

  • Selector illumination

  • Climate control unit (vehicles with manual air conditioner)

  • Audio unit

  • Clock spring

  • Related wiring harness

Light switch at OFF position

1.0 or less

3K

Power supply

HAZARD 25 A fuse

Under any condition

B+

  • HAZARD 25 A fuse

  • Related wiring harness

3L

Power supply

HAZARD 25 A fuse

Under any condition

B+

  • HAZARD 25 A fuse

  • Related wiring harness


*1 Vehicles with theft-deterrent system

*2 Vehicles with DRL system

*3 Vehicles with auto wiper system

*4 Vehicles with front fog light system

Inspection Using an Oscilloscope (Reference)

Pattern 1


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