2014 - Mazda6 - Multiplex Communication System

DETERMINING OPEN CIRCUIT LOCATION (MS-CAN)

CAUTION:

• Perform the following malfunction diagnosis only when it is diagnosed with a open circuit by 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 DTCs of the modules related to the CAN system.

2. Apply the communication error DTC and the failed module to DTC output pattern and malfunctioning location, and select the possible cause for the diagnostic result and the reference for the inspection item.

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.

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

4. After repairs, return to CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW, and verify that the repairs have been completed.

DTC output pattern and malfunctioning location

*1

With Bluetooth system

*2

With BSM system

*3

With manual air conditioner

*4

With full-auto air conditioner

A

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-35

• Connector C-35 malfunction

• Instrument cluster malfunction

System wiring diagram

Inspection item

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

• Instrument cluster body ground related wiring harness

• Instrument cluster connector

• Connector C-35

• Wiring harness between instrument cluster terminal C and connector C-35

• Wiring harness between instrument cluster terminal E and connector C-35

• Instrument cluster

B

Possible cause

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

• Audio unit power supply voltage or body ground malfunction

• Open circuit in wiring harness between audio unit and connector C-35

• Connector C-35 malfunction

• Audio unit malfunction

System wiring diagram

Inspection item

• Audio unit power supply voltage-related wiring harness and fuse

• Audio unit body ground related wiring harness

• Audio unit connector

• Connector C-35

• Wiring harness between audio unit terminal 1O and connector C-35

• Wiring harness between audio unit terminal 1Q and connector C-35

• Audio unit

C

With full-auto air conditioner

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 component and connector C-35

• Connector C-35 malfunction

• Climate control unit malfunction

System wiring diagram

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-35

• Wiring harness between climate control unit terminal 1S and connector C-35

• Wiring harness between climate control unit terminal 1U and connector C-35

• Climate control unit

With manual air conditioner

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-34

• Connector C-34 malfunction

• Climate control unit malfunction

System wiring diagram

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-34

• Wiring harness between climate control unit terminal U and connector C-34

• Wiring harness between climate control unit terminal W and connector C-34

• Climate control unit

D

Possible cause

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

• SIRIUS satellite radio unit power supply voltage or body ground malfunction

• Open circuit in wiring harness between SIRIUS satellite radio unit and connector C-35

• Connector C-35 malfunction

• SIRIUS satellite radio unit malfunction

System wiring diagram

Inspection item

• SIRIUS satellite radio unit power supply voltage-related wiring harness and fuse

• SIRIUS satellite radio unit body ground related wiring harness

• SIRIUS satellite radio unit connector

• Connector C-35

• Wiring harness between SIRIUS satellite radio unit terminal L and connector C-35

• Wiring harness between SIRIUS satellite radio unit terminal K and connector C-35

• SIRIUS satellite radio unit

E

Possible cause

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

• Open circuit in wiring harness between connector C-35 and connector C-34

• Connector C-35 malfunction

• Connector C-34 malfunction

System wiring diagram

Inspection item

• Connector C-35

• Connector C-34

• Wiring harness between connector C-35 and connector C-34

F

Possible cause

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

• Open circuit in wiring harness between connector C-34 and connector C-08

• Open circuit in wiring harness between connector C-08 and rear body control module (RBCM)

• CAN circuit in rear body control module (RBCM) malfunction

System wiring diagram

Inspection item

• Rear body control module (RBCM) connector

• Connector C-34

• Connector C-08

• Wiring harness between connector C-34 and connector C-08

• Wiring harness between connector C-08 and rear body control module (RBCM) terminal 3E

• Wiring harness between connector C-08 and rear body control module (RBCM) terminal 3G

• Rear body control module (RBCM)

• Between rear body control module (RBCM) terminal 3E and rear body control module (RBCM) terminal 4I

• Between rear body control module (RBCM) terminal 3G and rear body control module (RBCM) terminal 4L

G

Possible cause

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

• BSM control module (LH) power supply voltage or body ground malfunction

• Open circuit in wiring harness between BSM control module (LH) and connector C-23

• Open circuit in wiring harness between connector C-23 and rear body control module (RBCM)

• Connector C-23 malfunction

• BSM control module (LH) malfunction

• CAN circuit in rear body control module (RBCM) malfunction

System wiring diagram

Inspection item

• BSM control module (LH) power supply voltage-related wiring harness and fuse

• BSM control module (LH) body ground related wiring harness

• Rear body control module (RBCM) connector

• BSM control module (LH) connector

• Connector C-23

• Wiring harness between BSM control module (LH) terminal C and connector C-23

• Wiring harness between BSM control module (LH) terminal D and connector C-23

• Wiring harness between connector C-23 and rear body control module (RBCM) terminal 4I

• Wiring harness between connector C-23 and rear body control module (RBCM) terminal 4L

• BSM control module (LH)

• Rear body control module (RBCM)

• Between rear body control module (RBCM) terminal 3E and rear body control module (RBCM) terminal 4I

• Between rear body control module (RBCM) terminal 3G and rear body control module (RBCM) terminal 4L

H

Possible cause

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

• Rear body control module (RBCM) power supply voltage or body ground malfunction

• Rear body control module (RBCM) malfunction

System wiring diagram

Inspection item

• Rear body control module (RBCM) power supply voltage-related wiring harness and fuse

• Rear body control module (RBCM) body ground related wiring harness

• Rear body control module (RBCM)

I

1. Perform the clock input/output check mode. (See CLOCK INPUT/OUTPUT CHECK MODE.)

• "2:Er is displayed, inspect the inspection items in the possible causes for Clock Circuit Malfunction.

Clock Circuit Malfunction

Possible cause

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

• Clock component power supply voltage or body ground malfunction

• Open circuit in wiring harness between clock component and connector C-35

• Connector C-35 malfunction

• Clock component malfunction

System wiring diagram

Inspection item

• Clock component power supply voltage-related wiring harness and fuse

• Clock component body ground related wiring harness

• Clock component connector

• Connector C-35

• Wiring harness between clock component terminal E and connector C-35

• Wiring harness between clock component terminal G and connector C-35

• Clock component