Mazda CX-5 Service & Repair Manual: 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).
-
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)
|
Terminal |
Signal |
Connected to |
Measurement conditions |
Voltage (V) |
Inspection item(s) |
|
|
1A |
Power supply |
HAZARD 25 A fuse |
Under any condition |
B+ |
|
|
|
1B |
Power supply |
HAZARD 25 A fuse |
Under any condition |
B+ |
|
|
|
1C |
Ignition power supply |
|
Ignition switched ON (engine off) |
B+ |
|
|
|
Ignition switched OFF (LOCK) |
1.0 or less |
|||||
|
1D |
Signal ground |
Body ground |
Under any condition |
1.0 or less |
|
|
|
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+ |
|
|
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+ |
|
|
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+ |
|
|
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+ |
|
|
|
Light switch at OFF position |
1.0 or less |
|||||
|
1J |
Parking light control |
Parking light (RH, LH) |
Light switch at TNS position |
B+ |
|
|
|
Light switch at OFF position |
1.0 or less |
|||||
|
1K |
— |
— |
— |
— |
— |
|
|
1L |
Horn relay control |
Horn relay |
Horn switch not pressed |
B+ |
|
|
|
Horn switch pressed |
1.0 or less |
|||||
|
1M |
Headlight relay (LO) control |
Headlight relay (LO) |
Light switch at HEAD position |
1.0 or less |
|
|
|
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 |
|
|
|
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 switch ON |
1.0 or less |
|||||
|
1Q |
— |
— |
— |
— |
— |
|
|
1R*1 |
Theft-deterrent horn power supply |
R.WIPER 15 A fuse |
Under any condition |
B+ |
|
|
|
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+ |
|
|
|
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+ |
|
|
|
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+ |
|
|
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+ |
|
|
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+ |
|
|
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+ |
|
|
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+ |
|
|
|
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 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 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+ |
|
|
|
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 |
|
|
|
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 |
|
|
|
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 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 |
|
|
|
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 |
|
|
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 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 switch ON |
1.0 or less |
|||||
|
3A |
Wiper power supply |
WIPER 20 A fuse |
Under any condition |
B+ |
|
|
|
3B |
Wiper power supply |
WIPER 20 A fuse |
Under any condition |
B+ |
|
|
|
3C |
Windshield wiper motor (HI) control |
Windshield wiper motor |
Ignition switched ON (engine off) |
Windshield wiper switch at HI position |
B+ |
|
|
Windshield wiper switch at OFF position |
1.0 or less |
|||||
|
3D |
Power ground |
Body ground |
Under any condition |
1.0 or less |
|
|
|
3E |
Windshield wiper motor (HI) control |
Windshield wiper motor |
Ignition switched ON (engine off) |
Windshield wiper switch at HI position |
B+ |
|
|
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+ |
|
|
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 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+ |
|
|
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 switch at OFF position |
1.0 or less |
|||||
|
3J |
Interior illumination power supply |
|
Light switch at TNS position |
B+ |
|
|
|
Light switch at OFF position |
1.0 or less |
|||||
|
3K |
Power supply |
HAZARD 25 A fuse |
Under any condition |
B+ |
|
|
|
3L |
Power supply |
HAZARD 25 A fuse |
Under any condition |
B+ |
|
|
*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
-
Terminal:
-
Brake fluid level signal: 2Q (+) ? ground (-)
-
Washer level signal: 2S (+) ? ground (-)
-
Oscilloscope setting: 2 V/DIV (Y), 1 ms/DIV (X), DC range
Front Body Control Module (Fbcm) Configuration (Using Read/Write Function)
NOTE:
When performing configuration, it is necessary to read the vehicle specification
information from the front body control module (FBCM) before replacing it. Connect
the M-MDS to the ...
Front Body Control Module (Fbcm) Removal/Installation
CAUTION:
If configuration is not performed when the front body control module (FBCM)
is replaced with a new one, the vehicle specification information is not stored
in the front body con ...
Other materials:
PCM Configuration (Using As Built Data)
NOTE:
If the configuration is performed using As-Built data, the set value of the
personalization function is reset to the initial value (condition when shipped
from factory). Verify the set value with the customer and perform the personalization
function setting after performing th ...
Bsm Indicator Light Flashes While Not Under Bsm Indicator Light Flashing Conditions
(No Combination Switch Operation (Turn Signal Switch)) [Blind Spot Monitoring (Bsm)]
Description
BSM indicator light flashes while not under BSM indicator light-flashing
conditions (no combination switch operation (turn signal switch)
The BSM indicator light flashes despite not satisfying the BSM indicator
light flashing ...
Electric Variable Valve Timing Actuator
Purpose, Function
The electric variable valve timing actuator changes the phases of the intake
camshaft relative to the crankshaft. As a result, the open/close period of the
intake valve is changed, optimized valve timing in accordance with driving conditions
is realized, output is i ...
