ON-BOARD DIAGNOSTIC SYSTEM [REAR BODY CONTROL MODULE (RBCM)]

< Previous

2014 - Mazda6 - Body and Accessories

ON-BOARD DIAGNOSTIC SYSTEM [REAR BODY CONTROL MODULE (RBCM)]

Outline

The on-board diagnostic function consists of the following functions: A malfunction detection function, which detects overall malfunctions in the rear body control module (RBCM)-related parts; a memory function, which stores detected DTCs; a display function, which indicates malfunction locations and status via DTC output; and a PID/data monitoring function, which reads out specific input/output signals and verifies the input/output condition.

Using the Mazda Modular Diagnostic System (M-MDS), DTCs can be read out and deleted, and the PID/data monitoring function can be activated.

Malfunction detection function

Detects malfunctions in input/output signals.

If a malfunction occurs, the rear body control module (RBCM) records the malfunction as a DTC. A recorded DTC can be read by the Mazda Modular Diagnostic System (M-MDS).

×: Applicable—: Not applicable


DTC No.	Warning/indicator light	Description	Fail-safe function	Drive cycle	Self test type^*1	Memory function
B1079:13^*2	—	Hood latch switch circuit malfunction	—	—	D	—
B108F:16	—	Door lock switch circuit malfunction	—	—	D	—
B109E:87	—	Communication error with start stop unit	—	—	C, D	×
B113E:11^*3	—	Trunk lid opener switch (exterior) circuit malfunction	—	—	D	—
B1172:11	—	Front door lock-link switch (LH) unlock circuit malfunction	—	—	D	—
B1172:13	—	Front door lock-link switch (LH) unlock circuit malfunction	—	—	D	—
B1174:11	—	Without theft-deterrent system: Front door lock-link switch (RH) unlock circuit malfunction With theft-deterrent system: Front door lock-link switch (RH)/rear door lock-link switch (LH)/(RH) unlock circuit malfunction	—	—	D	—
B1174:13	—	Without theft-deterrent system: Front door lock-link switch (RH) unlock circuit malfunction With theft-deterrent system: Front door lock-link switch (RH)/rear door lock-link switch (LH)/(RH) unlock circuit malfunction	—	—	D	—
B1175:11	—	Front door latch switch (LH) circuit malfunction	—	—	D	—
B1176:11	—	Front door latch switch (RH) circuit malfunction	—	—	D	—
B1178:11	—	Trunk lid latch switch circuit malfunction	—	—	D	—
B11DA:16	—	Front door key cylinder switch (LH) circuit malfunction	—	—	D	—
B11E9:11	—	Rear door latch switch (LH) circuit malfunction	—	—	D	—
B11EA:11	—	Rear door latch switch (RH) circuit malfunction	—	—	D	—
B1219:11	—	Trunk lid opener switch (interior) circuit malfunction	—	—	D	—
B126A:11	—	Front door lock-link switch (LH) lock circuit malfunction	—	—	D	—
B126A:13	—	Front door lock-link switch (LH) lock circuit malfunction	—	—	D	—
C0023:14^*4	—	Brake light circuit malfunction	—	—	C, D	×
U0010:88	—	Unit communication error (MS-CAN)	—	—	C, D	×
U0155:00	—	Communication error with instrument cluster	—	—	C, D	×
U2100:00	—	Rear body control module (RBCM) configuration error	—	—	C, D	×
U3000:49	—	Rear body control module (RBCM) internal malfunction	—	—	C, D	×
U3003:16	—	Rear body control module (RBCM) power supply voltage low input	—	—	C, D	×

^*1: C: CMDTC self test, D: ODDTC self test
^*2: With hood latch switch
^*3: With advanced keyless entry system
^*4: With smart city brake support (SCBS)

DTC 7-digit code definition

When related systems or components have failed, the CM stores the DTC of the malfunctioning part in the CM memory, and allows for the retrieval of the stored data using the scanning tool when necessary. The DTCs are indicated using seven digits. Each digit indicates the following.

Status byte for DTC

The status byte is the two digits (after hyphen) after the 7-digit DTC.

The status byte is a code which indicates the pending code, current/past malfunction status, or warning illumination status.

The status byte can be read by performing a CMDTC self-test using the Mazda Modular Diagnostic System (M-MDS).

For details on the status byte, refer to the explanation on the Mazda Modular Diagnostic System (M-MDS) when reading the DTC.

Detection condition for the applicable DTC

×: Applicable—: Not applicable


DTC	System malfunction location	Detection condition
B1079:13	Hood latch switch circuit malfunction	Rear body control module (RBCM) detects an open circuit in hood latch switch circuit.
B108F:16	Door lock switch circuit malfunction	With the door lock switch off, the rear body control module (RBCM) detects door lock switch circuit voltage of 4 V or less.
B109E:87	Communication error with start stop unit	Rear body control module (RBCM) detects a communication error with the start stop unit for 10 times continuously.
B113E:11	Trunk lid opener switch (exterior) circuit malfunction	Rear body control module (RBCM) detects a short to ground in the trunk lid opener switch (exterior) circuit
B1172:11	Front door lock-link switch (LH) unlock circuit malfunction	Rear body control module (RBCM) detects a short to ground in the front door lock-link switch (LH) unlock circuit with the front door lock-link switch (LH) locked.
B1172:13	Front door lock-link switch (LH) unlock circuit malfunction	Rear body control module (RBCM) detects an open circuit in the front door lock-link switch (LH) unlock circuit with the front door lock-link switch (LH) unlocked.
B1174:11	Without theft-deterrent system: Front door lock-link switch (RH) unlock circuit malfunction With theft-deterrent system: Front door lock-link switch (RH)/rear door lock-link switch (LH)/(RH) unlock circuit malfunction	Without Theft-Deterrent System Rear body control module (RBCM) detects a short to ground in the door lock-link switch unlock circuit with the front door lock-link switch (RH) not unlocked. With Theft-Deterrent System Rear body control module (RBCM) detects a short to ground in the door lock-link switch unlock circuit with the front door lock-link switch (RH)/rear door lock-link switch (LH)/(RH) not unlocked.
B1174:13	Without theft-deterrent system: Front door lock-link switch (RH) unlock circuit malfunction With theft-deterrent system: Front door lock-link switch (RH)/rear door lock-link switch (LH)/(RH) unlock circuit malfunction	Without Theft-Deterrent System Rear body control module (RBCM) detects an open circuit in the door lock-link switch unlock circuit with the front door lock-link switch (RH) unlocked. With Theft-Deterrent System Rear body control module (RBCM) detects an open circuit in the door lock-link switch unlock circuit with the front door lock-link switch (RH)/rear door lock-link switch (LH)/(RH) unlocked.
B1175:11	Front door latch switch (LH) circuit malfunction	Rear body control module (RBCM) detects a short to ground in the front door latch switch (LH) circuit with the front door (LH) closed (front door latch switch (LH) off).
B1176:11	Front door latch switch (RH) circuit malfunction	Rear body control module (RBCM) detects a short to ground in the front door latch switch (RH) circuit with the front door (RH) closed (front door latch switch (RH) off).
B1178:11	Trunk lid latch switch circuit malfunction	Rear body control module (RBCM) detects short to ground in trunk lid latch switch circuit with the trunk closed (trunk lid latch switch off).
B11DA:16	Front door key cylinder switch (LH) circuit malfunction	Rear body control module (RBCM) detects the front door key cylinder switch (LH) circuit voltage of 4 V or less with the front door key cylinder switch (LH) off.
B11E9:11	Rear door latch switch (LH) circuit malfunction	Rear body control module (RBCM) detects a short to ground in the rear door latch switch (LH) circuit with the rear door (LH) closed (rear door latch switch (LH) off).
B11EA:11	Rear door latch switch (RH) circuit malfunction	Rear body control module (RBCM) detects a short to ground in the rear door latch switch (RH) circuit with the rear door (RH) closed (rear door latch switch (RH) off).
B1219:11	Trunk lid opener switch (interior) circuit malfunction	Rear body control module (RBCM) detects a short to ground in trunk lid opener switch (interior) circuit
B126A:11	Front door lock-link switch (LH) lock circuit malfunction	Rear body control module (RBCM) detects a short to ground in the front door lock-link switch (LH) lock circuit with the front door lock-link switch (LH) unlocked.
B126A:13	Front door lock-link switch (LH) lock circuit malfunction	Rear body control module (RBCM) detects an open circuit in the front door lock-link switch (LH) lock circuit with the front door lock-link switch (LH) locked.
C0023:14	Brake light circuit malfunction	Without Mazda Radar Cruise Control (MRCC) System Rear body control module (RBCM) detects any of the following conditions: Brake lights/high-mount brake light illuminated even though driver or system does not illuminate brake lights/high-mount brake lights. Brake lights/high-mount brake light not illuminated even though driver depresses brake pedal. Brake lights/high-mount brake light not illuminated even though system illuminates brake lights/high-mount brake light. With Mazda Radar Cruise Control (MRCC) System Rear body control module (RBCM) detects any of the following conditions: Brake lights/high-mount brake light illuminated even though driver or system does not illuminate brake lights/high-mount brake lights. Brake lights/high-mount brake light not illuminated even though driver depresses brake pedal. Brake lights/high-mount brake light not illuminated even though system illuminates brake lights/high-mount brake light.
U0010:88	Unit communication error (MS-CAN)	Rear body control module (RBCM) detects a CAN communication line (MS-CAN) error with the ignition switched ON (engine off or on).
U0155:00	Communication error with instrument cluster	Rear body control module (RBCM) cannot receive the CAN signals from the instrument cluster for 5 s or more with the ignition switched ON (engine off or on).
U2100:00	Rear body control module (RBCM) configuration error	Rear body control module (RBCM) configuration error (no configuration) detected.
U3000:49	Rear body control module (RBCM) internal malfunction	Rear body control module (RBCM) detects the internal malfunction.
U3003:16	Rear body control module (RBCM) power supply voltage low input	Rear body control module (RBCM) power supply circuit voltage of 5 V or more, less than 9 V is detected for 10 s or more.

Snapshot data

The rear body control module (RBCM) stores the following two types of snapshot data (vehicle information) when a DTC is detected and displays them in the Mazda Modular Diagnostic System (M-MDS).

Vehicle information detected by rear body control module (RBCM)

Vehicle information detected by instrument cluster and received by rear body control module (RBCM) via CAN signal

Snapshot data table—: Not applicable


Snapshot data item	Unit		Data contents	Data read/use method	Corresponding data monitor items
AAT	°C	°F	Ambient temperature	—	—
APP_STATUS	Accelerator Pedal Off/Under20%/Over20%/FAIL		Accelerator pedal position status	—	—
CFG_STATUS	Config Complete/Not Configured/Config Error		Instrument cluster configuration status	—	—
ECT_STATUS	Under 0 degrees C/0 - Under 80 degrees C/Over 80 degrees C/FAIL		Engine coolant temperature status	—	—
IC_VPWR	V		Instrument cluster power supply voltage	The rear body control module (RBCM) constantly receives the power supply voltage value of the instrument cluster sent via CAN signal from the instrument cluster. If a DTC is detected, the rear body control module (RBCM) records the power supply voltage of the instrument cluster when the DTC was detected, and it is displayed in the M-MDS.	VPWR
IG-ON_TIMER	hh:mm:ss		Elapsed time since ignition was switched ON (engine off or on) NOTE: The instrument cluster records the elapsed time since the ignition was switched ON (engine off or on).	The rear body control module (RBCM) constantly receives the elapsed time since the ignition was switched ON (engine off or on) sent via CAN signal from the instrument cluster. If a DTC is detected, the rear body control module (RBCM) records the elapsed time since the ignition was switched ON (engine off or on) when the DTC was detected, and it is displayed in the M-MDS.	—
PWR_MODE_KEY	Key Out/Key Recently Out (Position 0)/Accessory (Position 1)/Post Ignition (Position 2)/Ignition On (Position 2)/Running (Position 2)/Running - Starting		Key Out: Ignition switched off Key Recently Out (Position 0): Elapsed time within 3 s since ignition was switched off Accessory (Position 1): Ignition is switched to ACC Post Ignition (Position 2): Elapsed time within 3 s since ignition was switched ON (engine off or on) Ignition On (Position 2): Ignition switched ON (engine off) Running (Position 2): Ignition switched ON (engine on) Running - Starting: Cranking condition	The rear body control module (RBCM) constantly receives the ignition switch status sent via CAN signal from the instrument cluster. If a DTC is detected, the rear body control module (RBCM) records the ignition switch status when the DTC was detected, and it is displayed in the M-MDS.	—
RPM_STATUS	Engine Stop/Under1500rpm/Over1500rpm/FAIL		Engine speed status	The rear body control module (RBCM) constantly receives the engine speed sent via CAN signal from the instrument cluster. If a DTC is detected, the rear body control module (RBCM) records the engine speed when the DTC was detected, and it is displayed in the M-MDS.	TACHOMTR
SHIFT_STATUS	P/N/D/R/FAIL		Selector lever position status	The rear body control module (RBCM) constantly receives the selector lever position sent via CAN signal from the instrument cluster. If a DTC is detected, the rear body control module (RBCM) records the selector lever position when the DTC was detected, and it is displayed in the M-MDS.	—
TOTAL_DIST	km	Miles	Accumulated total traveled distance from completion of vehicle until rear body control module (RBCM) detects DTC (Odometer value in instrument cluster)	The total traveled distance from which the rear body control module (RBCM) detects DTCs to the present can be calculated by performing the following procedure. Verify the odometer value in the instrument cluster. Verify the snapshot data item TOTAL_DIST. Subtract 2 from 1.	—
TOTAL_TIME	hh:mm:ss		Accumulated total elapsed time since vehicle completion until rear body control module (RBCM) detects a DTC NOTE: When the ROOM fuse is removed, and the ignition is switched off, the time is not included in the elapsed time.	The elapsed time from which the rear body control module (RBCM) detects DTCs to the present can be calculated by performing the following procedure. Verify the instrument cluster PID item TOTAL_TIME. Verify the snapshot data item TOTAL_TIME. Subtract 2 from 1.	TOTAL_TIME
VPWR	V		Rear body control module (RBCM) power supply voltage	—	VPWR_IG1
VSPD_STATUS	Stop/0-10km/h/Over10km/h/FAIL		Vehicle speed status	The rear body control module (RBCM) constantly receives the vehicle speed sent via CAN signal from the instrument cluster. If a DTC is detected, the rear body control module (RBCM) records the vehicle speed when the DTC was detected, and it is displayed in the M-MDS.	SPEEDOMTR

Data monitor function

With the PID/data monitor function, input/output signal monitor items set in the rear body control module (RBCM) can be selected and read out in real-time.

PID/data monitor table

—: Not applicable


PID	Unit/Operation	Data contents	Data read/use method	Inspection item(s)
AT_DL_IG	Off/On	Off: Door lock actuator does not operate to unlock in conjunction with ignition off. On: Door lock actuator operates to unlock in conjunction with ignition off.	—	Door lock actuator
AT_DL_SHIFT	Off/On	Off: Door lock actuator does not operate to lock or unlock in conjunction with shifting. On: Door lock actuator operate to lock or unlock in conjunction with shifting.	—	Door lock actuator
AT_DL_VSPD	Off/On	Off: Door lock actuator does not operate to lock in conjunction with vehicle speed. On: Door lock actuator operates to lock in conjunction with vehicle speed.	—	Door lock actuator
BG_HORN_RLY^*1	Off/On	Off: Theft-deterrent horn relay is off. On: Theft-deterrent horn relay is on.	—	Theft-deterrent horn relay Rear body control module (RBCM)
BRAKE_SW^*2	Off/On	Off: Brake switch (No.1 signal) is off (brake pedal is not depressed). On: Brake switch (No.1 signal) is on (brake pedal is depressed).	—	Brake switch
C_DL_SW_LK	Off/On	Off: Door lock switch is not in lock. On: Door lock switch is in lock.	—	Door lock switch
C_DL_SW_UNL	Off/On	Off: Door lock switch is not in unlock. On: Door lock switch is in unlock.	—	Door lock switch
CNT_S_COMM	—	The rear body control module (RBCM) counts the lock/unlock request signal (serial transmission) received from the start stop unit. NOTE: If number of times exceeds 15, display returns to 0.	If the lock/unlock operation is performed by the remote transmitter or request switch, the start stop unit sends the lock/unlock request signal to the rear body control module (RBCM). If the lock/unlock request signal is received normally, the rear body control module (RBCM) increases the counter by one for the PID. When monitoring PID item CNT_S_COMM, switch the ignition off because the start stop unit does not output the lock/unlock signal when the ignition is switched ON.	Start stop unit
DL_MT_A_LK	Off/On	Off: All door lock actuators are not operated to lock. On: All door lock actuators are operated to lock.	—	Door lock actuator
DL_MT_A_UNL	Off/On	Off: All door lock actuators are not operated to unlock. On: All door lock actuators are operated to unlock.	—	Door lock actuator
DL_MT_D_UNL	Off/On	Off: Front door lock actuator (LH) is not operated to unlock. On: Front door lock actuator (LH) is operated to unlock.	—	Front door lock actuator (LH)
DL_MT_S-LK	NOTE: Displays in the M-MDS but it does not operate.
DOOR_ALL	Close/OPEN	Close: All doors are closed. OPEN: Any door is open.	—	Door latch switch
DOOR_D	Close/OPEN	Close: Front door (LH) is closed. OPEN: Front door (LH) is open.	—	Front door latch switch (LH)
ELAT_MT_RLY	Off/On	Off: Trunk lid latch is not operated to unlock. On: Trunk lid latch is operated to unlock.	—	Trunk lid latch and release actuator
ELAT_UNL	Off/On	Off: Trunk lid latch is not operated to unlock. On: Trunk lid latch is operated to unlock.	—	Trunk lid latch and release actuator
FUEL_SEN_M	V	Displays input voltage of fuel gauge sender unit input from rear body control module (RBCM)	If the fuel tank level is low, the rear body control module (RBCM) input voltage increases because the fuel gauge sender unit resistance decreases.	Fuel gauge sender unit
FUEL_SEN_S	V	Displays fuel gauge sender unit (SUB) input voltage input from rear body control module (RBCM)	If there is no fuel gauge sender unit (SUB), a constant 5 V is output.	—
FUEL_SEN_SV	V	Displays power voltage supplied to fuel gauge sender unit from rear body control module (RBCM) CAUTION: The battery voltage is supplied to the fuel gauge sender unit from the rear body control module (RBCM), however display of the PID item is controlled by the microcomputer and therefore 5 V is displayed. Accordingly, even if the actual terminal voltage differs from the PID item display, this does not indicate an abnormality.	After switching the ignition off, supply of the battery voltage to the fuel gauge sender unit from the rear body control module (RBCM) continues until the CAN communication is in the sleep mode.	Fuel gauge sender unit
HOOD^*1	Close/OPEN	Close: Hood is closed. OPEN: Hood is open.	—	Hood latch switch
IG1_SW	Off/On	Displays power input condition of rear body control module (RBCM) Off: IG1 power is not input to rear body control module (RBCM) On: IG1 power is input to rear body control module (RBCM)	If there is a malfunction in the IG1 power supply input to the rear body control module (RBCM), the door lock and interior light controls, which the rear body control module (RBCM) controls, do not operate normally because PID item IG1_SW is used for determining ignition on/off for the rear body control module (RBCM).	IG1 relay
KC_SW_D_LK	Off/On	Off: Front door key cylinder switch is not in lock. On: Front door key cylinder switch is in lock.	—	Front door key cylinder switch
KC_SW_D_UNL	Off/On	Off: Front door key cylinder switch is not in unlock. On: Front door key cylinder switch is in unlock.	—	Front door key cylinder switch
LL_P/R^*1	Unlock/Other	Unlock: Front door lock-link switch (RH), rear door lock-link switch (LH), rear door lock-link switch (RH) are in unlock. Other: Front door lock-link switch (RH), rear door lock-link switch (LH), rear door lock-link switch (RH) are in other than unlock.	—	Front door lock-link switch (RH) Rear door lock-link switch (LH) Rear door lock-link switch (RH)
LL_SW_D_LK	Off/On	Off: Front door lock-link switch (LH) is in unlock. On: Front door lock-link switch (LH) is in lock.	—	Front door lock-link switch (LH)
LL_SW_D_UNL	Off/On	Off: Front door lock-link switch (LH) is in lock. On: Front door lock-link switch (LH) is in unlock.	—	Front door lock-link switch (LH)
R_FOG_L_CS	NOTE: Displays in the M-MDS but it does not operate.
R_FOG_LMP	NOTE: Displays in the M-MDS but it does not operate.
R_LMP	Off/On	Off: Back-up light is turned off. On: Back-up light is turned on.	—	Back-up light
R_LMP_CS	Off/On/Unknown/Fault	Off: Back-up light off signal is received. On: Back-up light on signal is received. Unknown: Back-up light control signal not determined Fault: Communication with instrument cluster is failed.	—	Instrument cluster Back-up light
R_WIP_MT_LO	NOTE: Displays in the M-MDS but it does not operate.
ROOM_LMP	Off/On	Off: Front map light is turned off. On: Front map light is turned on.	—	Front map light
SEAT_B_2C	NOTE: Displays in the M-MDS but it does not operate.
SEAT_B_2L	NOTE: Displays in the M-MDS but it does not operate.
SEAT_B_2R	NOTE: Displays in the M-MDS but it does not operate.
SEAT_B_3C	NOTE: Displays in the M-MDS but it does not operate.
SEAT_B_3L	NOTE: Displays in the M-MDS but it does not operate.
SEAT_B_3R	NOTE: Displays in the M-MDS but it does not operate.
STOP_LMP^*2	Off/On	Off: Brake light is turned off. On: Brake light is turned on.	—	Brake light
STOP_LMP_CS^*2	Off/On	Off: Brake light off signal is received. On: Brake light on signal is received.	—	Instrument cluster Brake light
T_ROOM_LMP	Off/On	Off: Trunk compartment light is turned off. On: Trunk compartment light is turned on.	—	Trunk compartment light
T_UNL_SW^*3	Off/On	Off: Trunk lid opener switch (exterior) is not pressed. On: Trunk lid opener switch (exterior) is pressed.	—	Trunk lid opener switch (exterior)
T_UNL_SW_IP	Off/On	Off: Trunk lid opener switch (interior) is not pressed. On: Trunk lid opener switch (interior) is pressed.	—	Trunk lid opener switch (interior)
TRUNK	Close/OPEN	Close: Trunk is closed. OPEN: Trunk is open.	—	Trunk lid latch switch
VPWR_B_R	V	Displays voltage at rear body control module (RBCM) terminal 2P (power supply)	—	Battery
VPWR_IG1	V	Displays voltage at rear body control module (RBCM) terminal 2I (ignition power supply)	—	IG1 relay Battery

^*1: With theft-deterrent system
^*2: With smart city brake support (SCBS)
^*3: With advanced keyless entry system

Active Command Modes Function

The output parts set in the rear body control module (RBCM) can be operated regardless of the RBCM control condition.

Items which can be operated are as follows:


Simulation item	Unit/Operation	Data contents	Output part name
BG_HORN_RLY^*1	Off/On	Off: Stops theft-deterrent horn. On: Sounds the theft-deterrent horn.	Rear body control module (RBCM)
DL_MT_A	Lock/Unlock	Lock: Locks all of the doors. Unlock: Unlocks all of the doors.	Door lock actuator
ELAT_MT_RLY	Off/On	Off: Stops the trunk lid latch release operation. On: Releases the trunk lid latch.	Trunk lid latch and release actuator
ELAT_UNL	Off/On	Off: Stops the trunk lid latch release operation. On: Releases the trunk lid latch.	Trunk lid latch and release actuator
R_FOG_LMP	NOTE: Displays in the M-MDS but it does not operate.
R_LMP	Off/On	Off: Turns off back-up light. On: Illuminates back-up light.	Back-up light
R_WIP_MT_LO	NOTE: Displays in the M-MDS but it does not operate.
STOP_LMP_CS^*2	Off/On	Off: Turns off brake light. On: Illuminates brake light.	Brake light

^*1: With theft-deterrent horn
^*2: With smart city brake support (SCBS)

< Previous