DETERMINING OPEN CIRCUIT LOCATION (CAN-BUS No.3)

id100200002500

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.)

• 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.

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	U0100:00
	U0103:00
	U0121:00
	U0129:00
	U0131:00
	U0140:00																			×
	U0151:00
	U0155:00														×	×		×		×
	U0164:00		×		×			×			×			×		×		×		×
	U01BA:00
	U0291:00
	U102D:00
	U2121:00
	U212E:00						×	×			×			×		×		×		×
	U2131:00	×			×			×			×			×		×		×		×
	U2133:00												×	×		×		×		×
EPS control module	U0100:00
	U0121:00
	U0140:00																			×
	U2121:00
Electronically controlled brake unit	U0100:00
	U0101:00
	U0131:00
	U0140:00																			×
	U0151:00
	U0155:00														×	×		×		×
	U0164:00		×		×			×			×			×		×		×		×
	U2121:00
	U212E:00						×	×			×			×		×		×		×
	U2131:00	×			×			×			×			×		×		×		×
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
	U0120:00
	U0121:00
	U0121:87
	U0126:00									×	×			×		×		×		×
	U0131:00
	U0151:00
	U0155:00														×	×		×		×
	U0156:00
	U0158:00								×		×			×		×		×		×
	U0164:00		×		×			×			×			×		×		×		×
	U0182:00
	U01BA:00
	U0316:82
	U2121:49
	U212A:00																		×	×
	U212D:00																×	×		×
	U212E:00						×	×			×			×		×		×		×
	U2130:00
	U2131:00	×			×			×			×			×		×		×		×
	U2133:00												×	×		×		×		×
	U213A:00			×	×			×			×			×		×		×		×
	U213B:00					×		×			×			×		×		×		×
	U213C:00
Connectivity master unit (CMU)	U0101:00
	U0131:00
	U0140:00																			×
	U0151:00
	U0155:00														×	×		×		×
	U2121:00
	U213C:00
	U213E:00
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																×	×		×
Dash-electrical supply unit	U0100:00
	U0121:00
	U0151:00
	U212B:00																			×
	U212E:00						×
	U2131:00	×
	U2133:00												×
	U213A:00			×
SAS control module	U0140:00																			×
	U0155:00														×	×		×		×
	U0156:00														×	×		×		×
TCM [ET6A-EL, ET6AX-EL]	U0100:00
	U0121:00
	U0131:00
	U0140:00																			×
	U0155:00														×	×		×		×
	U212C:00
Integrated starter generator (ISG)	U0100:00
Mazda M Hybrid battery	U0100:00
DC-DC Converter (Mazda M Hybrid)	U0100:00
DC-DC Converter (Mazda M Hybrid)	U212B:00																			×
Selector lever	U0100:00
	U0101:00
	U0121:00
	U0140:00																			×
	U212B:00																			×
Parking lock actuator	U0100:00
	U0115:00
	U0100:41
	U0100:82
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)							×	×			×			×		×		×		×
Active driving display									×		×			×		×		×		×
Steering angle sensor										×	×			×		×		×		×
Steering lock unit												×		×		×		×		×
Climate control unit													×	×		×		×		×
Instrument cluster															×	×		×		×
Heat pump control unit																	×	×		×
Front combination light (RH)																			×	×
Front combination light (LH)																			×	×
Body control module (BCM)																				×
Diagnostic result
Possible cause and inspection item		A	B	C	D	E	F	G	I	H	J	L	K	M	N	O	P	Q	P	Q

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

a30zzw00005440

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

a30zzw00005441

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 (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-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 (driver's side) malfunction

System wiring diagram

a30zzw00005442

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-22

• Connector C-40

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

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

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

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

Possible cause

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

• Open circuit in wiring harness between connector C-40 and connector C-41

• Connector C-40 malfunction

• Connector C-41 malfunction

System wiring diagram

a30zzw00005443

Inspection item

• Connector C-40

• Connector C-41

• Wiring harness between connector C-40 and connector C-41

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 connector C-41

• Connector C-41 malfunction

• LF control unit malfunction

System wiring diagram

a30zzw00005444

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

• Connector C-41

• Wiring harness between LF control unit terminal M and connector C-41

• Wiring harness between LF control unit terminal P and connector C-41

• LF control 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-23

• Open circuit in wiring harness between connector C-23 and connector C-41

• Connector C-23 malfunction

• Connector C-41 malfunction

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

System wiring diagram

a30zzw00005445

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-23

• Connector C-41

• Wiring harness between connector C-23 and connector C-41

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

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

• 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-41 and connector C-13

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

• Connector C-41 malfunction

• Connector C-13 malfunction

• Connector C-38 malfunction

System wiring diagram

a30zzw00005446

Inspection item

• Connector C-41

• Connector C-13

• Connector C-38

• Wiring harness between connector C-41 and connector C-13

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

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

a30zzw00005447

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

• 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

a30zzw00005448

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

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

• Connector C-38 malfunction

• Connector C-39 malfunction

System wiring diagram

a30zzw00005449

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

• 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

a30zzw00005450

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

• 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

a30zzw00005451

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

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

• Connector C-36 malfunction

• Connector C-39 malfunction

System wiring diagram

a30zzw00005452

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

a30zzw00005453

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-33

• Connector C-36 malfunction

• Connector C-04 malfunction

• Connector C-33 malfunction

System wiring diagram

a30zzw00005454

Inspection item

• Connector C-36

• Connector C-04

• Connector C-33

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

• Wiring harness between connector C-04 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

a30zzw00005455

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

a30zzw00005456

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

a30zzw00005457

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

a30zzw00005458

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)