DETERMINING OPEN CIRCUIT LOCATION (CAN-BUS No.6)

id100200003700

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
Vehicle control module (VCM)		×
Front radar sensor			×		×
Front side radar sensor (LH)				×	×
Body control module (BCM)					×
Diagnostic result
Possible cause and inspection item		A	B	C	D

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-06

• Open circuit in wiring harness between connector C-06 and connector C-10

• Connector C-06 malfunction

• Connector C-10 malfunction

• Body control module (BCM) malfunction

System wiring diagram

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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

• Wiring harness between body control module (BCM) terminal 4N and connector C-06

• Wiring harness between body control module (BCM) terminal 4M and connector C-06

• Wiring harness between connector C-06 and connector C-10

• Connector C-06

• Connector C-10

• Body control module (BCM)

Possible cause

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

• Front radar sensor power supply voltage or body ground malfunction

• Open circuit in wiring harness between front radar sensor and connector C-10

• Connector C-10 malfunction

• Front radar sensor malfunction

System wiring diagram

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Inspection item

• Front radar sensor power supply voltage-related wiring harness and fuse

• Front radar sensor body ground related wiring harness

• Front radar sensor connector

• Wiring harness between front radar sensor terminal E and connector C-10

• Wiring harness between front radar sensor terminal C and connector C-10

• Front radar sensor

Possible cause

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

• Front side radar sensor (LH) power supply voltage or body ground malfunction

• Open circuit in wiring harness between front side radar sensor (LH) and connector C-10

• Connector C-10 malfunction

• Front side radar sensor (LH) malfunction

System wiring diagram

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Inspection item

• Front side radar sensor (LH) power supply voltage-related wiring harness and fuse

• Front side radar sensor (LH) body ground related wiring harness

• Front side radar sensor (LH) connector

• Connector C-10

• Wiring harness between front side radar sensor (LH) terminal C and connector C-10

• Wiring harness between front side radar sensor (LH) terminal D and connector C-10

• Front side radar sensor (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-10

• Connector C-10 malfunction

• Body control module (BCM) malfunction

System wiring diagram

a30zzw00001163

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

• Wiring harness between body control module (BCM) terminal 2A and connector C-10

• Wiring harness between body control module (BCM) terminal 2C and connector C-10

• Connector C-10

• Body control module (BCM)