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Determining Malfunctioning Part (MS-CAN) - Multiplex Communication System




DETERMINING MALFUNCTIONING PART (MS-CAN) [MULTIPLEX COMMUNICATION SYSTEM (L3 WITH TC)]

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 the following for the modules related to the CAN system.

- 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.
- The operation condition of the SIRIUS satellite radio system and the Bluetooth system and the audio amplifier.

2. Look for a DTC display pattern and system operation status in tandem which match.
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 (x) and asterisks (*).

3. Refer to the matching tandem diagnostic results (A to K) and inspect the possible cause and inspection item.

4. Perform the DTC inspection after the repair procedure.

- If any DTC is displayed, return to Initial Inspection and Diagnostic Overview.

Diagnostic Table for Determining Malfunctioning Part
Cross (x): DisplayedHyphen (-): May or may not be displayedAsterisk (*): No display or no operation





*1
The DTC is displayed on M-MDS.
*2
The DTC is displayed on the multi information display (display2).
*3
The DTC is displayed on the car-navigation unit.
*4
If "None ACU" is displayed on the multi information display (display2), no DTC is displayed.
*5
If "None EATC" is displayed on the multi information display (display2), no DTC is displayed.

A

Possible cause

- Connector terminal disconnection, poor contact, damage, deformation, corrosion
- Open circuit in wiring harness between instrument cluster 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 A
- Connector C-04 malfunction
- Connector C-15 malfunction
- Instrument cluster malfunction

System wiring diagram





Inspection item

- Instrument cluster connector
- Connector C-04
- Connector C-15
- Wiring harness between instrument cluster terminal 2V and connector C-04
- Wiring harness between instrument cluster terminal 2X and connector C-04
- Wiring harness between instrument connector C-04 and connector C-15
- Wiring harness between instrument connector C-15 and branch A
- Instrument cluster

B

Possible cause

- Connector terminal disconnection, poor contact, damage, deformation, corrosion
- Open circuit in wiring harness between audio amplifier and branch A
- Audio amplifier unit malfunction

System wiring diagram





Inspection item

- Audio amplifier connector
- Wiring harness between audio amplifier terminal 2O and branch A
- Wiring harness between audio amplifier terminal 2P and branch A
- Audio amplifier

C

Possible cause

- Connector terminal disconnection, poor contact, damage, deformation, corrosion
- Open circuit in wiring harness between branch A and connector C-15
- Open circuit in wiring harness between connector C-15 and branch B
- Connector C-15 malfunction

System wiring diagram





Inspection item

- Connector C-15
- Wiring harness between branch A and connector C-15
- Wiring harness between connector C-15 and branch B

D

Possible cause

- Connector terminal disconnection, poor contact, damage, deformation, corrosion
- Open circuit in wiring harness between branch B and SIRIUS satellite radio unit
- SIRIUS satellite radio unit malfunction

System wiring diagram





Inspection item

- SIRIUS satellite radio unit connector
- Wiring harness between SIRIUS satellite radio unit terminal L and branch B
- Wiring harness between SIRIUS satellite radio unit terminal K and branch B
- SIRIUS satellite radio unit

E

Possible cause

- Connector terminal disconnection, poor contact, damage, deformation, corrosion
- Open circuit in wiring harness between branch B and connector C-04
- Connector C-04 malfunction

System wiring diagram





Inspection item

- Connector C-04
- Wiring harness between branch B and connector C-04

F

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





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

G

Possible cause

- Connector terminal disconnection, poor contact, damage, deformation, corrosion
- Open circuit in wiring harness between connector C-04 and branch C
- Connector C-04 malfunction

System wiring diagram





Inspection item

- Connector C-04
- Wiring harness between connector C-04 and branch C

H

Possible cause

- Connector terminal disconnection, poor contact, damage, deformation, corrosion
- Open circuit in wiring harness between branch C and branch D

System wiring diagram





Inspection item

- Wiring harness between branch C and branch D

I

Possible cause

- Connector terminal disconnection, poor contact, damage, deformation, corrosion
- Open circuit in wiring harness between climate control unit and branch D
- Climate control unit malfunction

System wiring diagram





Inspection item

- Climate control unit connector
- Wiring harness between climate control unit terminal 1B and branch D
- Wiring harness between climate control unit terminal 1A and branch D
- Climate control unit

J

Possible cause

- Connector terminal disconnection, poor contact, damage, deformation, corrosion
- Open circuit in wiring harness between audio/car-navigation unit and branch D
- audio/car-navigation unit malfunction

System wiring diagram





Inspection item

- Audio/car-navigation unit connector
- Wiring harness between audio/car-navigation unit terminal 1O and branch D
- Wiring harness between audio/car-navigation unit terminal 1Q and branch D
- Audio/car-navigation unit

K

Possible cause

- Connector terminal disconnection, poor contact, damage, deformation, corrosion
- Open circuit in wiring harness between multi information display and branch D
- Multi information display malfunction

System wiring diagram





Inspection item

- Multi information display connector
- Wiring harness between multi information display terminal 1V and branch D
- Wiring harness between multi information display terminal 1X and branch D
- Multi information display

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