ON-BOARD DIAGNOSTIC FUNCTION

• The on-board diagnostic system consists of a malfunction detection system that detects abnormalities in input/output signals, a data monitor function that reads out specified input/output signals.

• The data link connector 2 (DLC-2), which groups together all the connectors used for malfunction diagnosis and detecting/repair into a single location, has been adopted, thereby improving serviceability. Diagnosis is performed by connecting the Mazda Modular Diagnostic System (M-MDS) to the DLC-2.

• In addition to DTC read-out, the Mazda Modular Diagnostic System (M-MDS) is used to clear DTCs using the display screen of the diagnostic tester, and to access the PID/data monitor function, providing enhanced malfunction diagnosis and improved serviceability.

• The malfunction detection function detects malfunctions in the input/output signal system of the BCM.

DTC No.	Description	Detection condition
B1C53:13	Windshield wiper switch circuit malfunction	• Open circuit in windshield wiper switch INT/AUTO circuit.
B1D06:11	Turn light (LH) circuit malfunction	• Short to ground in wiring harness between turn light (LH) and BCM.
B1D06:15	Turn light (LH) circuit malfunction	• Open circuit or short to power supply in wiring harness between turn light (LH) and BCM.
B1D07:11	Turn light (RH) circuit malfunction	• Short to ground in wiring harness between turn light (RH) and BCM.
B1D07:15	Turn light (RH) circuit malfunction	• Open circuit or short to power supply in wiring harness between turn light (RH) and BCM.
B1D13:12	Interior light circuit malfunction	• Short to power supply in wiring harness between interior light and BCM.
B1D35:11	Hazard warning switch circuit malfunction	• Short to ground in wiring harness between hazard warning switch and BCM.
B1D36:92	Turn switch circuit malfunction	• Short to ground in wiring harness between turn switch and BCM.
B10A6:92^*2	Light switch circuit malfunction	• Short to ground in wiring harness between light switch and BCM for 2 s or more.
B1008:11	Windshield wiper switch circuit malfunction	• Short to ground in wiring harness between windshield wiper INT/AUTO circuit and BCM.
B1013:23	Rear window defroster switch circuit malfunction	• Rear window defroster switch is in a pressed condition for 2 min or more (rear defroster switch stuck).
B1172:92	Door lock-link (driver-side) switch circuit malfunction	• Lock/unlock signals are input simultaneously for 6 s or more.
B1175:13	Front door latch switch (driver-side) circuit malfunction	• Open circuit in wiring harness between front door latch switch (driver-side) and BCM.
B1176:13	Front door latch switch (passenger-side) circuit malfunction	• Open circuit in wiring harness between front door latch switch (passenger-side) and BCM.
B1178:11	Liftgate latch switch circuit malfunction	• Short to ground in wiring harness between liftgate latch switch and BCM.
U0001:88	CAN system communication error (HS-CAN)	• BCM CAN system error.
U0028:81	Vehicles with advanced keyless and start system • Communication error with keyless control module Vehicles with keyless entry system • Communication error with keyless receiver	Vehicles with advanced keyless and start system • Communication error between keyless control module and BCM. Vehicles with keyless entry system • Communication error between keyless receiver and BCM.
U0028:83	Vehicles with advanced keyless and start system • Error signal from keyless control module Vehicles with keyless entry system • Error signal from keyless receiver
U0028:87	Vehicles with advanced keyless and start system • No response from keyless control module Vehicles with keyless entry system • No response from keyless receiver
U0100:00	Communication error to PCM	• Communication error between PCM and BCM.
U0101:00^*1	Communication error to TCM	• Communication error between TCM and BCM.
U0121:00	Communication error to ABS HU/CM or DSC HU/CM	• Communication error between ABS HU/CM or DSC HU/CM.
U0415:68	Error signal from ABS HU/CM or DSC HU/CM	• Correct data cannot be received from ABS HU/CM or DSC HU/CM.
U2100:00	BCM configuration not implemented	• BCM configuration setting not done correctly.
U3000:44	BCM configuration setting invalid
U3003:16	BCM power supply voltage low (less than 10 V)	• BCM power supply voltage less than 10 V for 20 s or more.
U3003:17	BCM power supply voltage high (16 V or more)	• BCM power supply voltage 16 V or more for 10 s or more.

DTC No.

Description

Detection condition

B1C53:13

Windshield wiper switch circuit malfunction

• Open circuit in windshield wiper switch INT/AUTO circuit.

B1D06:11

Turn light (LH) circuit malfunction

• Short to ground in wiring harness between turn light (LH) and BCM.

B1D06:15

Turn light (LH) circuit malfunction

• Open circuit or short to power supply in wiring harness between turn light (LH) and BCM.

B1D07:11

Turn light (RH) circuit malfunction

• Short to ground in wiring harness between turn light (RH) and BCM.

B1D07:15

Turn light (RH) circuit malfunction

• Open circuit or short to power supply in wiring harness between turn light (RH) and BCM.

B1D13:12

Interior light circuit malfunction

• Short to power supply in wiring harness between interior light and BCM.

B1D35:11

Hazard warning switch circuit malfunction

• Short to ground in wiring harness between hazard warning switch and BCM.

B1D36:92

Turn switch circuit malfunction

• Short to ground in wiring harness between turn switch and BCM.

B10A6:92^*2

Light switch circuit malfunction

• Short to ground in wiring harness between light switch and BCM for 2 s or more.

B1008:11

Windshield wiper switch circuit malfunction

• Short to ground in wiring harness between windshield wiper INT/AUTO circuit and BCM.

B1013:23

Rear window defroster switch circuit malfunction

• Rear window defroster switch is in a pressed condition for 2 min or more (rear defroster switch stuck).

B1172:92

Door lock-link (driver-side) switch circuit malfunction

• Lock/unlock signals are input simultaneously for 6 s or more.

B1175:13

Front door latch switch (driver-side) circuit malfunction

• Open circuit in wiring harness between front door latch switch (driver-side) and BCM.

B1176:13

Front door latch switch (passenger-side) circuit malfunction

• Open circuit in wiring harness between front door latch switch (passenger-side) and BCM.

B1178:11

Liftgate latch switch circuit malfunction

• Short to ground in wiring harness between liftgate latch switch and BCM.

U0001:88

CAN system communication error (HS-CAN)

• BCM CAN system error.

U0028:81

Vehicles with advanced keyless and start system

• Communication error with keyless control module

Vehicles with keyless entry system

• Communication error with keyless receiver

Vehicles with advanced keyless and start system

• Communication error between keyless control module and BCM.

Vehicles with keyless entry system

• Communication error between keyless receiver and BCM.

U0028:83

Vehicles with advanced keyless and start system

• Error signal from keyless control module

Vehicles with keyless entry system

• Error signal from keyless receiver

U0028:87

Vehicles with advanced keyless and start system

• No response from keyless control module

Vehicles with keyless entry system

• No response from keyless receiver

U0100:00

Communication error to PCM

• Communication error between PCM and BCM.

U0101:00^*1

Communication error to TCM

• Communication error between TCM and BCM.

U0121:00

Communication error to ABS HU/CM or DSC HU/CM

• Communication error between ABS HU/CM or DSC HU/CM.

U0415:68

Error signal from ABS HU/CM or DSC HU/CM

• Correct data cannot be received from ABS HU/CM or DSC HU/CM.

U2100:00

BCM configuration not implemented

• BCM configuration setting not done correctly.

U3000:44

BCM configuration setting invalid

U3003:16

BCM power supply voltage low (less than 10 V)

• BCM power supply voltage less than 10 V for 20 s or more.

U3003:17

BCM power supply voltage high (16 V or more)

• BCM power supply voltage 16 V or more for 10 s or more.

• The PID/data monitor function is used for optionally selecting input/output signal monitor items preset in the BCM and reading them out in real-time.

PID/DATA monitor item	Unit/Condition	Operation condition	Inspection item (s)
BRK_FLUID	Normal/Low	• Normal: Brake fluid level above MIN. • Low: Brake fluid level less than MIN.	Brake fluid level sensor
DR_LOCK_ACT	Off/Lock	• Off: Front door (driver-side) lock knob unlocked. • Lock: Front door (driver-side) lock knob locked.	Front door lock actuator (driver-side)
DRSW_D	Close/OPEN	• Close: Front door (driver-side) closed. • OPEN: Front door (driver-side) opened.	Front door latch switch (driver-side)
DRSW_LR	Close/OPEN	• Close: Rear door (LH) closed. • OPEN: Rear door (LH) opened.	Rear Door latch switch (LH)
DRSW_P	Close/OPEN	• Close: Front door (passenger-side) closed. • OPEN: Front door (passenger-side) opened.	Front door latch switch (passenger-side)
DRSW_RR	Close/OPEN	• Close: Rear door (RH) closed. • OPEN: Rear door (RH) opened.	Rear Door latch switch (RH)
FOG_F_RLY^*1	Off/On	• Off: Light switch not at FRONT FOG position, lights off condition. • On: Light switch at FRONT FOG position, lights on condition.	Front fog light relay
FOG_F_SW^*1	Off/On	• Off: Front fog light switch in off position. • On: Front fog light switch in on position.	Light switch
FOG_R_SW^*2	Off/On	• Off: Rear fog light switch in off position. • On: Rear fog light switch in on position.	Light switch
H/L_HI_SW	Off/On	• Off: Light switch not at HI position. • On: Light switch at HI position.	Light switch
H/L_LO_RLY	Off/On	• Off: Light switch at OFF position. • On: Light switch at HEAD position.	Headlight relay (LO)
H/L_LO_SW	Off/On	• Off: Light switch not at LO position. • On: Light switch at LO position.	Light switch
HAZARD	Off/On	• Off: Hazard warning switch in off position. • On: Hazard warning switch in on position.	Hazard warning switch
IG_KEY_IN	Key-Out/Key-In	• Key-Out: Except below. • Key-In: Key inserted into key cylinder.	Key reminder switch
KEY_LOCK_SW	Off/Lock	• Off: Door key cylinder not at LOCK. • Lock: Door key cylinder at LOCK.	Front door key cylinder switch (driver-side)
KEY_UNLK_SW	Off/Unlock	• Off: Door key cylinder not at UNLOCK. • Unlock: Door key cylinder at UNLOCK.	Front door key cylinder switch (driver-side)
OIL_PRS_SW	Off/On	• Off: Engine stopped. • On: Engine running.	Oil pressure switch
PWR_IG1	Off/On	• Off: Ignition switch is off. • On: Ignition switch is ON.	Ignition switch
R_DEF	Off/On	• Off: Rear window defroster not operating. • On: Rear window defroster operating.	Filament
R_DEF_IND	Off/On	• Off: Rear window defroster indicator not illuminated. • On: Rear window defroster indicator illuminated.	Climate control unit (rear window defroster indicator)
R_DEF_SW	Off/On	• Off: Rear window defroster switch not pressed. • On: Rear window defroster switch pressed.	Climate control unit (rear window defroster switch)
R_GEAR_SW	Not_R/R	• ATX/CVT ― Not_R: Selector lever is not at R position. ― R: Selector lever is at R position. • MTX ― Not_R: Shift lever is not at R position. ― R: Shift lever is at R position.	TR switch (ATX/CVT)/Back-up light switch (MTX)
ROOM_LMP	%	• 100 %: Door opened • 0 %: Door closed	Interior light
TNS_SW	Off/On	• Off: Light switch not at TNS position. • On: Light switch at TNS position.	Light switch
TR/LG_SW	Close/OPEN	• Close: Liftgate closed. • OPEN: Liftgate opened.	Liftgate latch and lock actuator
TURN_L_L	Off/On	• Off: Turn light (LH) off. • On: Turn light (LH) flashing.	Turn light
TURN_L_R	Off/On	• Off: Turn light (RH) off. • On: Turn light (RH) flashing.	Turn light
TURN_SW_L	Off/On	• Off: Turn switch at off position. • On: Turn switch at LEFT position.	Turn switch (light switch)
TURN_SW_R	Off/On	• Off: Turn switch at off position. • On: Turn switch at RIGHT position.	Turn switch (light switch)
VPWR	V	• Indicates the BCM power supply voltage.	BCM
VSPD	KPH	• Vehicle stopped: 0 km/h (mph). • Vehicle driven: Displays vehicle speed.	—
WASHER_F	Off/On	• Off: Windshield washer switch is off. • On: Windshield washer switch is on.	Windshield washer switch
WASHER_R	Off/On	• Off: Rear washer switch is off. • On: Rear washer switch is on.	Rear washer switch
WIP_F_HI	Off/On	• Off: Windshield wiper switch not at HI position. • On: Windshield wiper switch at HI position.	Windshield wiper switch
WIP_F_INT	Off/On	• Off: Windshield wiper switch not at INT position. • On: Windshield wiper switch at INT position.	Windshield wiper switch
WIP_F_LO	Off/On	• Off: Windshield wiper switch not at LO position. • On: Windshield wiper switch at LO position.	Windshield wiper switch
WIP_F_PPOS	Off/On	• Off: Windshield wiper switch not operating. • On: Windshield wiper switch operating.	Windshield wiper switch
WIP_R_INT	Off/On	• Off: Rear wiper switch not at INT position. • On: Rear wiper switch at INT position.	Rear wiper switch
WIP_R_ON	Off/On	• Off: Rear wiper switch at OFF. • On: Rear wiper switch at ON.	Rear wiper switch
WPRLY_F_HI	Off/On	• Off: Windshield wiper operating in position except HI position. • On: Windshield wiper operating at HI position.	Windshield wiper motor
WPRLY_F_LO	Off/On	• Off: Windshield wiper operating in position except LO position. • On: Windshield wiper operating at LO position.	Windshield wiper motor
WPRLY_R	Off/On	• Off: Rear wiper not operating. • On: Rear wiper operating.	Rear wiper motor

PID/DATA monitor item

Unit/Condition

Operation condition

Inspection item (s)

BRK_FLUID

Normal/Low

• Normal: Brake fluid level above MIN.

• Low: Brake fluid level less than MIN.

Brake fluid level sensor

DR_LOCK_ACT

Off/Lock

• Off: Front door (driver-side) lock knob unlocked.

• Lock: Front door (driver-side) lock knob locked.

Front door lock actuator (driver-side)

DRSW_D

Close/OPEN

• Close: Front door (driver-side) closed.

• OPEN: Front door (driver-side) opened.

Front door latch switch (driver-side)

DRSW_LR

Close/OPEN

• Close: Rear door (LH) closed.

• OPEN: Rear door (LH) opened.

Rear Door latch switch (LH)

DRSW_P

Close/OPEN

• Close: Front door (passenger-side) closed.

• OPEN: Front door (passenger-side) opened.

Front door latch switch (passenger-side)

DRSW_RR

Close/OPEN

• Close: Rear door (RH) closed.

• OPEN: Rear door (RH) opened.

Rear Door latch switch (RH)

FOG_F_RLY^*1

Off/On

• Off: Light switch not at FRONT FOG position, lights off condition.

• On: Light switch at FRONT FOG position, lights on condition.

Front fog light relay

FOG_F_SW^*1

Off/On

• Off: Front fog light switch in off position.

• On: Front fog light switch in on position.

Light switch

FOG_R_SW^*2

Off/On

• Off: Rear fog light switch in off position.

• On: Rear fog light switch in on position.

Light switch

H/L_HI_SW

Off/On

• Off: Light switch not at HI position.

• On: Light switch at HI position.

Light switch

H/L_LO_RLY

Off/On

• Off: Light switch at OFF position.

• On: Light switch at HEAD position.

Headlight relay (LO)

H/L_LO_SW

Off/On

• Off: Light switch not at LO position.

• On: Light switch at LO position.

Light switch

HAZARD

Off/On

• Off: Hazard warning switch in off position.

• On: Hazard warning switch in on position.

Hazard warning switch

IG_KEY_IN

Key-Out/Key-In

• Key-Out: Except below.

• Key-In: Key inserted into key cylinder.

Key reminder switch

KEY_LOCK_SW

Off/Lock

• Off: Door key cylinder not at LOCK.

• Lock: Door key cylinder at LOCK.

Front door key cylinder switch (driver-side)

KEY_UNLK_SW

Off/Unlock

• Off: Door key cylinder not at UNLOCK.

• Unlock: Door key cylinder at UNLOCK.

Front door key cylinder switch (driver-side)

OIL_PRS_SW

Off/On

• Off: Engine stopped.

• On: Engine running.

Oil pressure switch

PWR_IG1

Off/On

• Off: Ignition switch is off.

• On: Ignition switch is ON.

Ignition switch

R_DEF

Off/On

• Off: Rear window defroster not operating.

• On: Rear window defroster operating.

Filament

R_DEF_IND

Off/On

• Off: Rear window defroster indicator not illuminated.

• On: Rear window defroster indicator illuminated.

Climate control unit (rear window defroster indicator)

R_DEF_SW

Off/On

• Off: Rear window defroster switch not pressed.

• On: Rear window defroster switch pressed.

Climate control unit (rear window defroster switch)

R_GEAR_SW

Not_R/R

• ATX/CVT

― Not_R: Selector lever is not at R position.

― R: Selector lever is at R position.

• MTX

― Not_R: Shift lever is not at R position.

― R: Shift lever is at R position.

TR switch (ATX/CVT)/Back-up light switch (MTX)

ROOM_LMP

• 100 %: Door opened

• 0 %: Door closed

Interior light

TNS_SW

Off/On

• Off: Light switch not at TNS position.

• On: Light switch at TNS position.

Light switch

TR/LG_SW

Close/OPEN

• Close: Liftgate closed.

• OPEN: Liftgate opened.

Liftgate latch and lock actuator

TURN_L_L

Off/On

• Off: Turn light (LH) off.

• On: Turn light (LH) flashing.

Turn light

TURN_L_R

Off/On

• Off: Turn light (RH) off.

• On: Turn light (RH) flashing.

Turn light

TURN_SW_L

Off/On

• Off: Turn switch at off position.

• On: Turn switch at LEFT position.

Turn switch (light switch)

TURN_SW_R

Off/On

• Off: Turn switch at off position.

• On: Turn switch at RIGHT position.

Turn switch (light switch)

VPWR

• Indicates the BCM power supply voltage.

BCM

VSPD

KPH

• Vehicle stopped: 0 km/h (mph).

• Vehicle driven: Displays vehicle speed.

—

WASHER_F

Off/On

• Off: Windshield washer switch is off.

• On: Windshield washer switch is on.

Windshield washer switch

WASHER_R

Off/On

• Off: Rear washer switch is off.

• On: Rear washer switch is on.

Rear washer switch

WIP_F_HI

Off/On

• Off: Windshield wiper switch not at HI position.

• On: Windshield wiper switch at HI position.

Windshield wiper switch

WIP_F_INT

Off/On

• Off: Windshield wiper switch not at INT position.

• On: Windshield wiper switch at INT position.

Windshield wiper switch

WIP_F_LO

Off/On

• Off: Windshield wiper switch not at LO position.

• On: Windshield wiper switch at LO position.

Windshield wiper switch

WIP_F_PPOS

Off/On

• Off: Windshield wiper switch not operating.

• On: Windshield wiper switch operating.

Windshield wiper switch

WIP_R_INT

Off/On

• Off: Rear wiper switch not at INT position.

• On: Rear wiper switch at INT position.

Rear wiper switch

WIP_R_ON

Off/On

• Off: Rear wiper switch at OFF.

• On: Rear wiper switch at ON.

Rear wiper switch

WPRLY_F_HI

Off/On

• Off: Windshield wiper operating in position except HI position.

• On: Windshield wiper operating at HI position.

Windshield wiper motor

WPRLY_F_LO

Off/On

• Off: Windshield wiper operating in position except LO position.

• On: Windshield wiper operating at LO position.

Windshield wiper motor

WPRLY_R

Off/On

• Off: Rear wiper not operating.

• On: Rear wiper operating.

Rear wiper motor

• The active command modes function is used for optionally selecting active command items of output parts preset in the BCM, and to operate them regardless of BCM control.

Command name	Unit/Operation	Operation condition	Output part name
FOG_F_RLY^*1	Off/On	• Off : Front fog lights not illuminated. • On : Front fog lights illuminated.	Front fog light relay
H/L_LO_RLY	Off/On	• Off : Headlights (LO) not illuminated. • On : Headlights (LO) illuminated.	Headlight relay (LO)
TURN_L_L	Off/On	• Off : Turn light (LH) does not flashe. • On : Turn light (LH) flashes.	Turn light (LH)
TURN_L_R	Off/On	• Off : Turn light (RH) does not flashe. • On : Turn light (RH) flashes.	Turn light (RH)
WPRLY_F_HI^*2	Off/On	• Off : Windshield wiper (HI) not operation. • On : Windshield wiper (HI) operation.	Windshield wiper motor
WPRLY_F_LO	Off/On	• Off : Windshield wiper (LO) not operation. • On : Windshield wiper (LO) operation.	Windshield wiper motor
WPRLY_R	Off/On	• Off : Rear wiper not operation. • On : Rear wiper operation.	Rear wiper motor