DETERMINING OPEN CIRCUIT LOCATION (CAN-BUS No.5)
id100200003300
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Caution
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• 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.)
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Note
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• 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
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M-MDS display
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DTC
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DTC output pattern and malfunctioning location
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DTC output module
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PCM
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U0100:00
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U0103:00
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U0121:00
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U0129:00
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U0131:00
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U0140:00
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×
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U0151:00
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U0155:00
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U0164:00
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U01BA:00
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U0291:00
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U102D:00
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U2121:00
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U212E:00
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U2131:00
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U2133:00
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EPS control module
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U0100:00
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U0121:00
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U0140:00
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×
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U2121:00
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Electronically controlled brake unit
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U0100:00
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U0101:00
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U0131:00
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U0140:00
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×
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U0151:00
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U0155:00
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U0164:00
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U2121:00
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U212E:00
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U2131:00
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Vehicle control module (VCM)
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U0100:00
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U0101:00
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U0121:00
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U0126:00
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U0131:00
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U0140:00
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×
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U0151:00
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U0155:00
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U0156:00
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U0164:00
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U2120:00
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×
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×
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×
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U2122:00
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U2123:00
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U2125:00
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×
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×
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×
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U2126:00
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U212E:00
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U2131:00
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U2132:00
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×
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×
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U2133:00
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U2139:00
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U213A:00
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Body control module (BCM)
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U0100:00
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U0101:00
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U0103:00
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U0103:87
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U0111:00
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U0115:00
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U0120:00
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U0121:00
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U0121:87
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U0126:00
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U0131:00
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U0151:00
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U0155:00
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U0156:00
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U0158:00
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U0164:00
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U0182:00
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U01BA:00
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U0316:82
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U2121:49
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U212A:00
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U212D:00
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U212E:00
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U2130:00
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U2131:00
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U2133:00
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U213A:00
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U213B:00
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U213C:00
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Connectivity master unit (CMU)
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U0101:00
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U0131:00
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U0140:00
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×
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U0151:00
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U0155:00
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U2121:00
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U213C:00
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U213E:00
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Auto leveling control module
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U0122:87
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U212A:87
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U212B:87
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×
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U212D:87
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Adaptive LED headlights control module
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U0122:87
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U0126:87
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U0155:87
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U2121:87
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U212A:87
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U212B:87
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×
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U212D:87
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Dash-electrical supply unit
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U0100:00
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U0121:00
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U0151:00
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U212B:00
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×
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U212E:00
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U2131:00
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U2133:00
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U213A:00
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SAS control module
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U0140:00
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×
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U0155:00
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U0156:00
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TCM [ET6A-EL, ET6AX-EL]
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U0100:00
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U0121:00
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U0131:00
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U0140:00
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×
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U0155:00
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U212C:00
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Integrated starter generator (ISG)
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U0100:00
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Mazda M Hybrid battery
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U0100:00
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DC-DC Converter (Mazda M Hybrid)
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U0100:00
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U212B:00
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×
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Selector lever
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U0100:00
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U0101:00
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U0121:00
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U0140:00
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×
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U212B:00
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×
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Parking lock actuator
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U0100:00
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U0115:00
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U0100:41
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U0100:82
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M-MDS display module
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Module displayed in red or blue
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Forward sensing camera (FSC)
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×
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×
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×
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Driver monitoring camera unit
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×
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×
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×
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Parking assist unit (optical) / 360° view monitor control module
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×
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×
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Body control module (BCM)
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×
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Diagnostic result
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Possible cause and inspection item
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A
With driver monitoring (DM)
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Possible cause
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• Connector terminal disconnection, poor contact, damage, deformation, corrosion
• Forward sensing camera (FSC) power supply voltage or body ground malfunction
• Open circuit in wiring harness between forward sensing camera (FSC) and connector C-27
• Open circuit in wiring harness between connector C-27 and connector C-16
• Open circuit in wiring harness between connector C-16 and connector C-38
• Connector C-27 malfunction
• Connector C-16 malfunction
• Connector C-38 malfunction
• Forward sensing camera (FSC) malfunction
System wiring diagram
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Inspection item
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• Forward sensing camera (FSC) power supply voltage-related wiring harness and fuse
• Forward sensing camera (FSC) body ground related wiring harness
• Forward sensing camera (FSC) connector
• Connector C-27
• Connector C-16
• Connector C-38
• Wiring harness between forward sensing camera (FSC) terminal B and connector C-27
• Wiring harness between forward sensing camera (FSC) terminal A and connector C-27
• Wiring harness between connector C-27 and connector C-16
• Wiring harness between connector C-16 and connector C-38
• Forward sensing camera (FSC)
Without driver monitoring (DM)
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Possible cause
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• Connector terminal disconnection, poor contact, damage, deformation, corrosion
• Forward sensing camera (FSC) power supply voltage or body ground malfunction
• Open circuit in wiring harness between forward sensing camera (FSC) and connector C-27
• Open circuit in wiring harness between connector C-27 and connector C-16
• Open circuit in wiring harness between connector C-16 and connector C-13
• Connector C-27 malfunction
• Connector C-16 malfunction
• Connector C-13 malfunction
• Forward sensing camera (FSC) malfunction
System wiring diagram
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Inspection item
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• Forward sensing camera (FSC) power supply voltage-related wiring harness and fuse
• Forward sensing camera (FSC) body ground related wiring harness
• Forward sensing camera (FSC) connector
• Connector C-27
• Connector C-16
• Connector C-13
• Wiring harness between forward sensing camera (FSC) terminal B and connector C-27
• Wiring harness between forward sensing camera (FSC) terminal A and connector C-27
• Wiring harness between connector C-27 and connector C-16
• Wiring harness between connector C-16 and connector C-13
• Forward sensing camera (FSC)
B
Possible cause
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• Connector terminal disconnection, poor contact, damage, deformation, corrosion
• Driver monitoring camera unit power supply voltage or body ground malfunction
• Open circuit in wiring harness between driver monitoring camera unit and connector C-38
• Connector C-38 malfunction
• Driver monitoring camera unit malfunction
System wiring diagram
Inspection item
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• Driver monitoring camera unit power supply voltage-related wiring harness and fuse
• Driver monitoring camera unit body ground related wiring harness
• Driver monitoring camera unit connector
• Connector C-38
• Wiring harness between driver monitoring camera unit terminal 1F and connector C-38
• Wiring harness between driver monitoring camera unit terminal 1E and connector C-38
• Driver monitoring camera unit
C
With parking assist unit (optical) / 360°view monitor control module
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Possible cause
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• Connector terminal disconnection, poor contact, damage, deformation, corrosion
• Open circuit in wiring harness between connector C-38 and connector C-13
• Open circuit in wiring harness between connector C-13 and connector C-40
• Connector C-38 malfunction
• Connector C-13 malfunction
• Connector C-40 malfunction
System wiring diagram
Inspection item
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• Wiring harness between connector C-38 and connector C-13
• Wiring harness between connector C-13 and connector C-40
• Connector C-38
• Connector C-13
• Connector C-40
Without parking assist unit (optical) / 360°view monitor control module
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Possible cause
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• Connector terminal disconnection, poor contact, damage, deformation, corrosion
• Open circuit in wiring harness between connector C-38 and connector C-13
• Open circuit in wiring harness between connector C-13 and connector C-06
• Connector C-38 malfunction
• Connector C-13 malfunction
• Connector C-06 malfunction
System wiring diagram
Inspection item
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• Wiring harness between connector C-38 and connector C-13
• Wiring harness between connector C-13 and connector C-06
• Connector C-38
• Connector C-13
• Connector C-06
D
Possible cause
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• Connector terminal disconnection, poor contact, damage, deformation, corrosion
• Parking assist unit (optical) / 360° view monitor control module power supply voltage or body ground malfunction
• Open circuit in wiring harness between parking assist unit (optical) / 360° view monitor control module and connector C-40
• Connector C-40 malfunction
• Parking assist unit (optical) / 360° view monitor control module malfunction
System wiring diagram
Inspection item
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• Parking assist unit (optical) / 360° view monitor control module power supply voltage-related wiring harness and fuse
• Parking assist unit (optical) / 360° view monitor control module body ground related wiring harness
• Parking assist unit (optical) / 360° view monitor control module connector
• Wiring harness between parking assist unit (optical) / 360° view monitor control module terminal 1C and connector C-40
• Wiring harness between parking assist unit (optical) / 360° view monitor control module terminal 1A and connector C-40
• Connector C-40
• Parking assist unit (optical) / 360° view monitor control module
E
Possible cause
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• 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-40
• Connector C-06 malfunction
• Connector C-40 malfunction
• Body control module (BCM) malfunction
System wiring diagram
Inspection item
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• 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 2E and connector C-06
• Wiring harness between body control module (BCM) terminal 2G and connector C-06
• Wiring harness between connector C-06 and connector C-40
• Connector C-06
• Connector C-40
• Body control module (BCM)
