DETERMINING OPEN CIRCUIT LOCATION (CAN-BUS No.3) [R.H.D.]

id100226002500

Caution

• Perform the following malfunction diagnosis only when it is diagnosed with a open circuit by CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [R.H.D.].)

• If the malfunctioning part is detected in the communication line, before disconnecting the related connector for inspection, press the connector in the connection direction to verify that there is no looseness or disconnection.

• When disconnecting the connector, verify that there is no damage, deformation, or corrosion of the connector terminals.

Warning

<<High voltage>>

• Always observe the following thoroughly to ensure safety when inspecting or removing/installing parts in the motor compartment. Otherwise, the high voltage circuit may operate on the vehicle regardless of whether or not the main power is switched OFF or ON (READY off or on). If this occurs, it could cause electrical shock and result in serious injury or, in the worst case, death.

― Do not select high voltage battery cooling on center display after EV system stops

― Do not open/close doors frequently with main power switched OFF

― Do not perform normal charging or quick charging

― Switch to connected vehicle maintenance mode (MyMazda App connected vehicle)

― Cancel climate control timer

― Operate center display and turn off battery heater operation

Warning

• The cooling fan may suddenly start operating regardless of the main power switch position. Keep hands and tools away from the cooling fan even if the cooling fan is not operating to prevent injury, or damage to the cooling fan. When servicing the cooling fan or parts near the cooling fan, ensure the following.

― Do not perform normal charging or quick charging

― Do not select high voltage battery cooling on center display after EV system stops

― Do not open/close doors frequently with main power switched OFF

― Switch to connected vehicle maintenance mode (MyMazda App connected vehicle)

― Cancel climate control timer

― Operate center display and turn off battery heater operation

1. Verify the CAN system-related module DTCs and the module displayed in red or blue on the M-MDS screen.

2. Apply the communication error DTC and the module displayed in red or blue to the DTC output pattern and malfunctioning location, and select the possible cause for the diagnostic result and the reference for the inspection item. (See DTC Output Pattern And Malfunctioning Location)

Note

• The open circuit location can be determined by the DTC indicated in the DTC output pattern and malfunctioning location chart. DTCs not listed in the chart are not used for the determination of the open circuit location. (See DTC Output Pattern And Malfunctioning Location.)

• The module may be displayed in red or blue on the M-MDS screen even if there is no malfunction depending on the vehicle specification.

3. Inspect the possible cause and inspection item of the applicable malfunctioning part.

DTC Output Pattern And Malfunctioning Location

Cross (×): Communication error-related DTC

M-MDS display	DTC	DTC output pattern and malfunctioning location
DTC output module	DTC	DTC output pattern and malfunctioning location
PCM (e-SKYACTIV)	U0100:00
	U0103:00
	U0121:00
	U0129:00
	U0131:00
	U0140:00																					×
	U0151:00
	U0155:00														×	×		×		×		×
	U0156:00
	U0164:00		×		×			×			×			×		×		×		×		×
	U016B:00																×	×		×		×
	U01BA:00
	U0291:00
	U102D:00
	U2121:00
	U212E:00						×	×			×			×		×		×		×		×
	U2131:00	×			×			×			×			×		×		×		×		×
	U2133:00											×		×		×		×		×		×
Parking lock actuator	U0100:00
	U0115:00
	U0100:41
	U0100:82
Electronically controlled brake unit	U0100:00
	U0131:00
	U0140:00																					×
	U0151:00
	U0155:00														×	×		×		×		×
	U0164:00		×		×			×			×			×		×		×		×		×
	U2121:00
	U212E:00						×	×			×			×		×		×		×		×
	U2131:00	×			×			×			×			×		×		×		×		×
SAS control module	U0140:00																					×
	U0155:00														×	×		×		×		×
	U0155:41														×	×		×		×		×
	U0155:82														×	×		×		×		×
	U0156:00														×	×		×		×		×
	U0156:41														×	×		×		×		×
	U0156:82														×	×		×		×		×
Auto leveling control module	U0122:87
	U212A:87																				×	×
	U212B:87																					×
	U212D:87																		×	×		×
Adaptive LED headlights control module	U0122:87
	U0126:87								×		×			×		×		×		×		×
	U0155:87														×	×		×		×		×
	U2121:87
	U212A:87																				×	×
	U212B:87																					×
	U212D:87																		×	×		×
Selector lever	U0100:00
	U0121:00
	U0140:00																					×
	U212B:00																					×
EPS control module	U0100:00
	U0121:00
	U0140:00																					×
	U2121:00																					×
Vehicle control module (VCM)	U0100:00
	U0101:00
	U0121:00
	U0126:00								×		×			×		×		×		×		×
	U0131:00
	U0140:00																					×
	U0151:00
	U0155:00														×	×		×		×		×
	U0156:00
	U0164:00		×		×			×			×			×		×		×		×		×
	U2120:00
	U2122:00
	U2123:00
	U2125:00
	U2126:00
	U212E:00						×	×			×			×		×		×		×		×
	U2131:00	×			×			×			×			×		×		×		×		×
	U2132:00
	U2133:00											×		×		×		×		×		×
	U2139:00
	U213A:00			×	×			×			×			×		×		×		×		×
Body control module (BCM)	U0100:00
	U0101:00
	U0103:00
	U0103:87
	U0111:00
	U0115:00
	U0121:00
	U0121:87
	U0126:00								×		×			×		×		×		×		×
	U0131:00
	U0151:00
	U0155:00														×	×		×		×		×
	U0156:00
	U0158:00									×	×			×		×		×		×		×
	U0164:00		×		×			×			×			×		×		×		×		×
	U016B:00																×	×		×		×
	U0182:00
	U0198:00
	U01BA:00
	U2121:49
	U212A:00																					×
	U212D:00																		×
	U212E:00						×	×			×			×		×		×		×		×
	U2131:00	×			×			×			×			×		×		×		×		×
	U2133:00											×		×		×		×		×		×
	U2135:00
	U213A:00			×	×			×			×			×		×		×		×		×
	U213B:00					×		×			×			×		×		×		×		×
	U213C:00
	U2147:00
Dash-electrical supply unit	U0100:00
	U0121:00
	U0140:00																					×
	U0151:00
	U0156:00
	U016B:00																×
	U212E:00						×
	U2131:00	×
	U2133:00											×
	U213A:00			×
Heat pump control unit	U2133:00											×		×		×		×		×		×
	U0140:00																					×
	U0164:00		×		×			×			×			×		×
Connectivity master unit (CMU)	U0101:00
	U0131:00
	U0140:00																					×
	U0151:00
	U0155:00														×	×		×		×		×
	U0198:00
	U2121:00
	U213C:00
	U213E:00
Emergency call unit	U0140:00																					×
	U0151:00
	U0164:00		×		×			×			×			×		×		×		×		×
	U213C:00
Approaching vehicle audible system device	U0101:00
Approaching vehicle audible system device	U0121:00
M-MDS display module		Module displayed in red or blue
Electrical supply unit (ESU)		×			×			×			×			×		×		×		×		×
Dash-electrical supply unit			×		×			×			×			×		×		×		×		×
Door-electrical supply unit (passenger's side)				×	×			×			×			×		×		×		×		×
LF control unit						×		×			×			×		×		×		×		×
Door-electrical supply unit (driver's side)							×	×			×			×		×		×		×		×
Steering angle sensor									×		×			×		×		×		×		×
Active driving display										×	×			×		×		×		×		×
Climate control unit												×		×		×		×		×		×
Steering lock unit													×	×		×		×		×		×
Instrument cluster															×	×		×		×		×
Heat pump control unit																	×	×		×		×
Front combination light (RH)																			×	×		×
Front combination light (LH)																					×	×
Diagnostic result
Possible cause and inspection item		A	B	C	D	E	F	G	H	I	J	K	L	M	N	O	P	Q	R	S	T	U

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• Electrical supply unit (ESU) power supply voltage or body ground malfunction

• Open circuit in wiring harness between electrical supply unit (ESU) and connector C-40

• Connector C-40 malfunction

• Electrical supply unit (ESU) malfunction

System wiring diagram

a30zzw00006561

Inspection item

• Electrical supply unit (ESU) power supply voltage-related wiring harness and fuse

• Electrical supply unit (ESU) body ground related wiring harness

• Electrical supply unit (ESU) connector

• Connector C-40

• Wiring harness between electrical supply unit (ESU) terminal 3A and connector C-40

• Wiring harness between electrical supply unit (ESU) terminal 3C and connector C-40

• Electrical supply unit (ESU)

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• Dash-electrical supply unit power supply voltage or body ground malfunction

• Open circuit in wiring harness between connector C-40 and dash-electrical supply unit

• Connector C-40 malfunction

• Dash-electrical supply unit malfunction

System wiring diagram

a30zzw00006562

Inspection item

• Dash-electrical supply unit power supply voltage-related wiring harness and fuse

• Dash-electrical supply unit body ground related wiring harness

• Dash-electrical supply unit connector

• Connector C-40

• Wiring harness between dash-electrical supply unit terminal 1K and connector C-40

• Wiring harness between dash-electrical supply unit terminal 1I and connector C-40

• Dash-electrical supply unit

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• Door-electrical supply unit (passenger's side) power supply voltage or body ground malfunction

• Open circuit in wiring harness between door-electrical supply unit (passenger's side) and connector C-22

• Open circuit in wiring harness between connector C-22 and connector C-40

• Connector C-22 malfunction

• Connector C-40 malfunction

• Door-electrical supply unit (passenger's side) malfunction

System wiring diagram

a30zzw00006563

Inspection item

• Door-electrical supply unit (passenger's side) power supply voltage-related wiring harness and fuse

• Door-electrical supply unit (passenger's side) body ground related wiring harness

• Door-electrical supply unit (passenger's side) connector

• Connector C-22

• Connector C-40

• Wiring harness between connector C-22 and connector C-40

• Wiring harness between door-electrical supply unit (passenger's side) terminal 1A and connector C-22

• Wiring harness between door-electrical supply unit (passenger's side) terminal 1B and connector C-22

• Door-electrical supply unit (passenger's side)

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• Open circuit in wiring harness between connector C-40 and connectors C-78, C-79

• Connector C-40 malfunction

• Connectors C-78, C-79 malfunction

System wiring diagram

a30zzw00006564

Inspection item

• Connector C-40

• Connectors C-78, C-79

• Wiring harness between connector C-40 and connectors C-78, C-79

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• LF control unit power supply voltage or body ground malfunction

• Open circuit in wiring harness between LF control unit and connectors C-78, C-79

• Connectors C-78, C-79 malfunction

• LF control unit malfunction

System wiring diagram

a30zzw00006565

Inspection item

• LF control unit power supply voltage-related wiring harness and fuse

• LF control unit body ground related wiring harness

• LF control unit connector

• Connectors C-78, C-79

• Wiring harness between LF control unit terminal M and connectors C-78, C-79

• Wiring harness between LF control unit terminal P and connectors C-78, C-79

• LF control unit

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• Door-electrical supply unit (driver's side) power supply voltage or body ground malfunction

• Open circuit in wiring harness between door-electrical supply unit (driver's side) and connector C-23

• Open circuit in wiring harness between connector C-23 and connectors C-78, C-79

• Connector C-23 malfunction

• Connectors C-78, C-79 malfunction

• Door-electrical supply unit (driver's side) malfunction

System wiring diagram

a30zzw00006566

Inspection item

• Door-electrical supply unit (driver's side) power supply voltage-related wiring harness and fuse

• Door-electrical supply unit (driver's side) body ground related wiring harness

• Door-electrical supply unit (driver's side) connector

• Connector C-23

• Connectors C-78, C-79

• Wiring harness between connector C-23 and connectors C-78, C-79

• Wiring harness between door-electrical supply unit (driver's side) terminal 1A and connector C-23

• Wiring harness between door-electrical supply unit (driver's side) terminal 1B and connector C-23

• Door-electrical supply unit (driver's side)

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• Open circuit in wiring harness between connectors C-78, C-79 and connector C-13

• Open circuit in wiring harness between connector C-13 and connector C-38

• Connectors C-78, C-79 malfunction

• Connector C-13 malfunction

• Connector C-38 malfunction

System wiring diagram

a30zzw00006567

Inspection item

• Connectors C-78, C-79

• Connector C-13

• Connector C-38

• Wiring harness between connectors C-78, C-79 and connector C-13

• Wiring harness between connector C-13 and connector C-38

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• Steering angle sensor power supply voltage or body ground malfunction

• Open circuit in wiring harness between steering angle sensor and connector C-38

• Connector C-38 malfunction

• Steering angle sensor malfunction

System wiring diagram

a30zzw00006568

Inspection item

• Steering angle sensor power supply voltage-related wiring harness and fuse

• Steering angle sensor body ground related wiring harness

• Steering angle sensor connector

• Connector C-38

• Wiring harness between steering angle sensor terminal B and connector C-38

• Wiring harness between steering angle sensor terminal C and connector C-38

• Steering angle sensor

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• Active driving display power supply voltage or body ground malfunction

• Open circuit in wiring harness between active driving display and connector C-38

• Connector C-38 malfunction

• Active driving display malfunction

System wiring diagram

a30zzw00006569

Inspection item

• Active driving display power supply voltage-related wiring harness and fuse

• Active driving display body ground related wiring harness

• Active driving display connector

• Connector C-38

• Wiring harness between active driving display terminal I and connector C-38

• Wiring harness between active driving display terminal G and connector C-38

• Active driving display

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• Open circuit in wiring harness between connector C-38 and connector C-39

• Connector C-38 malfunction

• Connector C-39 malfunction

System wiring diagram

a30zzw00006570

Inspection item

• Connector C-38

• Connector C-39

• Wiring harness between connector C-38 and connector C-39

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• Climate control unit power supply voltage or body ground malfunction

• Open circuit in wiring harness between climate control unit and connector C-39

• Connector C-39 malfunction

• Climate control unit malfunction

System wiring diagram

a30zzw00006571

Inspection item

• Climate control unit power supply voltage-related wiring harness and fuse

• Climate control unit body ground related wiring harness

• Climate control unit connector

• Connector C-39

• Wiring harness between climate control unit terminal 1K and connector C-39

• Wiring harness between climate control unit terminal 1N and connector C-39

• Climate control unit

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• Steering lock unit power supply voltage or body ground malfunction

• Open circuit in wiring harness between steering lock unit and connector C-39

• Connector C-39 malfunction

• Steering lock unit malfunction

System wiring diagram

a30zzw00006572

Inspection item

• Steering lock unit power supply voltage-related wiring harness and fuse

• Steering lock unit body ground related wiring harness

• Steering lock unit connector

• Connector C-39

• Wiring harness between steering lock unit terminal B and connector C-39

• Wiring harness between steering lock unit terminal D and connector C-39

• Steering lock unit

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• Open circuit in wiring harness between connector C-39 and connector C-36

• Connector C-36 malfunction

• Connector C-39 malfunction

System wiring diagram

a30zzw00006573

Inspection item

• Connector C-39

• Connector C-36

• Wiring harness between connector C-36 and connector C-39

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• Instrument cluster power supply voltage or body ground malfunction

• Open circuit in wiring harness between instrument cluster and connector C-36

• Connector C-36 malfunction

• Instrument cluster malfunction

System wiring diagram

a30zzw00006574

Inspection item

• Instrument cluster power supply voltage-related wiring harness and fuse

• Instrument cluster body ground related wiring harness

• Instrument cluster connector

• Connector C-36

• Wiring harness between instrument cluster terminal AK and connector C-36

• Wiring harness between instrument cluster terminal AM and connector C-36

• Instrument cluster

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• Open circuit in wiring harness between connector C-04 and connector C-36

• Open circuit in wiring harness between connector C-04 and connector C-34

• Connector C-36 malfunction

• Connector C-04 malfunction

• Connector C-34 malfunction

System wiring diagram

a30zzw00006575

Inspection item

• Connector C-36

• Connector C-04

• Connector C-34

• Wiring harness between connector C-36 and connector C-04

• Wiring harness between connector C-04 and connector C-34

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• Heat pump control unit power supply voltage or body ground malfunction

• Open circuit in wiring harness between heat pump control unit and connector C-09

• Open circuit in wiring harness between connector C-09 and connector C-34

• Connector C-34 malfunction

• Connector C-09 malfunction

• Heat pump control unit malfunction

System wiring diagram

a30zzw00006576

Inspection item

• Heat pump control unit power supply voltage-related wiring harness and fuse

• Heat pump control unit body ground related wiring harness

• Heat pump control unit connector

• Wiring harness between connector C-09 and connector C-34

• Wiring harness between heat pump control unit terminal C and connector C-09

• Wiring harness between heat pump control unit terminal E and connector C-09

• Connector C-34

• Connector C-09

• Heat pump control unit

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• Open circuit in wiring harness between connector C-34 and connector C-33

• Connector C-34 malfunction

• Connector C-33 malfunction

System wiring diagram

a30zzw00006577

Inspection item

• Connector C-34

• Connector C-33

• Wiring harness between connector C-34 and connector C-33

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• Front combination light (RH) power supply voltage or body ground malfunction

• Open circuit in wiring harness between front combination light (RH) and connector C-33

• Connector C-33 malfunction

• Front combination light (RH) malfunction

System wiring diagram

a30zzw00006578

Inspection item

• Front combination light (RH) power supply voltage-related wiring harness and fuse

• Front combination light (RH) body ground related wiring harness

• Front combination light (RH) connector

• Connector C-33

• Wiring harness between front combination light (RH) terminal D and connector C-33

• Wiring harness between front combination light (RH) terminal E and connector C-33

• Front combination light (RH)

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• Open circuit in wiring harness between connector C-31 and connector C-33

• Connector C-31 malfunction

• Connector C-33 malfunction

System wiring diagram

a30zzw00006579

Inspection item

• Connector C-31

• Connector C-33

• Wiring harness between connector C-31 and connector C-33

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• Front combination light (LH) power supply voltage or body ground malfunction

• Open circuit in wiring harness between front combination light (LH) and connector C-31

• Connector C-31 malfunction

• Front combination light (LH) malfunction

System wiring diagram

a30zzw00006580

Inspection item

• Front combination light (LH) power supply voltage-related wiring harness and fuse

• Front combination light (LH) body ground related wiring harness

• Front combination light (LH) connector

• Connector C-31

• Wiring harness between front combination light (LH) terminal D and connector C-31

• Wiring harness between front combination light (LH) terminal E and connector C-31

• Front combination light (LH)

Possible cause

• Connector terminal disconnection, poor contact, damage, deformation, corrosion

• Body control module (BCM) power supply voltage or body ground malfunction

• Open circuit in wiring harness between body control module (BCM) and connector C-31

• Connector C-31 malfunction

• Body control module (BCM) malfunction

System wiring diagram

a30zzw00006581

Inspection item

• Body control module (BCM) power supply voltage-related wiring harness and fuse

• Body control module (BCM) body ground related wiring harness

• Body control module (BCM) connector

• Connector C-31

• Wiring harness between Body control module (BCM) terminal 2L and connector C-31

• Wiring harness between Body control module (BCM) terminal 2J and connector C-31

• Body control module (BCM)