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Caution

• 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 following items to the Diagnostic Table for Determining Malfunctioning Part, and then verify the reference to the malfunctioning location.

• Communication error DTCs

• Malfunctioning module

• Display status of the air conditioner/audio control on the multi information display when the climate control unit, or either the audio unit is operated.

Note

• A hyphen (-) in the DTC output pattern cell indicates that the DTC may or may not be displayed depending on the malfunction detection conditions. If it is not displayed, the malfunctioning location can be determined by checking the crosses (×).

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

4.Perform the DTC inspection after the repair procedure.

• If any DTC is displayed, return to FOREWORD [MULTIPLEX COMMUNICATION SYSTEM (R.H.D. (MZR-CD 2.2))].

Diagnostic Table for Determining Malfunctioning Part

Cross (×): DisplayedHyphen (-): May or may not be displayed

A

Possible cause

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

• Open circuit in wiring harness between instrument cluster and branch A

• Instrument cluster malfunction

System wiring diagram

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Inspection item

• Instrument cluster connector

• Wiring harness between instrument cluster terminal 2V and branch A

• Wiring harness between instrument cluster terminal 2X and branch A

• Instrument cluster

B

Possible cause

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

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

• Open circuit in wiring harness between connector C-04 and connector C-15

• Open circuit in wiring harness between connector C-15 and branch B

• Connector C-04 malfunction

• Connector C-15 malfunction

System wiring diagram

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Inspection item

• Connector C-04

• Connector C-15

• Wiring harness between branch A and connector C-04

• Wiring harness between connector C-04 and connector C-15

• Wiring harness between connector C-15 and branch B

C

Possible cause

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

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

• Connector C-04 malfunction

• Bluetooth unit malfunction

System wiring diagram

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Inspection item

• Bluetooth unit connector

• Connector C-04

• Wiring harness between Bluetooth unit terminal Y and connector C-04

• Wiring harness between Bluetooth unit terminal Z and connector C-04

• Bluetooth unit

D

Possible cause

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

• Open circuit in wiring harness between audio amplifier and branch B

• Audio amplifier malfunction

System wiring diagram

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Inspection item

• Audio amplifier connector

• Wiring harness between audio amplifier terminal 2O and branch B

• Wiring harness between audio amplifier terminal 2P and branch B

• Audio amplifier

E

Possible cause

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

• Open circuit in wiring harness between branch B and connector C-05

• Open circuit in wiring harness between connector C-05 and branch C

• Connector C-05 malfunction

System wiring diagram

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Inspection item

• Connector C-05

• Wiring harness between branch B and connector C-05

• Wiring harness between connector C-05 and branch C

F

Possible cause

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

• Open circuit in wiring harness between climate control unit and branch C

• Climate control unit malfunction

System wiring diagram

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Inspection item

• Climate control unit connector

• Wiring harness between climate control unit terminal 1B and branch C

• Wiring harness between climate control unit terminal 1A and branch C

• Climate control unit

G

Possible cause

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

• Open circuit in wiring harness between audio/car-navigation unit and branch C

• Audio/car-navigation unit malfunction

System wiring diagram

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Inspection item

• Audio/car-navigation unit connector

• Wiring harness between audio/car-navigation unit terminal 1O and branch C

• Wiring harness between audio/car-navigation unit terminal 1Q and branch C

• Audio/car-navigation unit

H

Possible cause

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

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

• Open circuit in wiring harness between multi information display and connector C-23

• Connector C-23 malfunction

• Multi information display malfunction

System wiring diagram

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Inspection item

• Connector C-23

• Multi information display connector

• Wiring harness between branch C and connector C-23

• Wiring harness between multi information display terminal 1V and connector C-23

• Wiring harness between multi information display terminal 1X and connector C-23

• Multi information display