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

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

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
- The operation condition of the hands-free telephone (HF/TEL) system.
- The operation condition of the SIRIUS satellite radio system.

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 C) 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 operation





A

Possible cause

- Connector terminal disconnection, poor contact, damage, deformation, corrosion
- Open circuit in wiring harness between audio unit and branch A
- Open circuit in wiring harness between branch A and connector C-14
- Open circuit in wiring harness between connector C-14 and branch B
- Audio unit malfunction

System wiring diagram





Inspection item

- Audio unit connector
- Connector C-14
- Wiring harness between audio unit terminal 1O and branch A
- Wiring harness between audio unit terminal 1Q and branch A
- Wiring harness between branch A and connector C-14
- Wiring harness between connector C-14 and branch B
- Audio unit

B

Possible cause

- Connector terminal disconnection, poor contact, damage, deformation, corrosion
- Open circuit in wiring harness between HF/TEL unit and branch B
- HF/TEL unit malfunction

System wiring diagram





Inspection item

- HF/TEL unit connector
- Wiring harness between HF/TEL unit terminal Q and branch B
- Wiring harness between HF/TEL unit terminal R and branch B
- HF/TEL unit

C

Possible cause

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

System wiring diagram





Inspection item

- SIRIUS satellite radio unit connector
- Wiring harness between SIRIUS satellite radio unit terminal 2L and branch B
- Wiring harness between SIRIUS satellite radio unit terminal 2K and branch B
- SIRIUS satellite radio unit