Determining Open Circuit Location (MS-CAN) - Multiplex Communication System
DETERMINING OPEN CIRCUIT LOCATION (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 DTCs of the modules related to the CAN system.
2. Apply the following items to the DTC output pattern and the malfunctioning location, and then verify the reference to the malfunctioning location.
- Communication error DTCs
- Display status of the air conditioner/audio control on the information display when the climate control unit, or either the audio unit or the car-navigation unit is operated.
- The operation condition of the SIRIUS satellite radio system and the hands-free telephone system.
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. 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 Initial Inspection and Diagnostic Overview.
DTC Output Pattern and Malfunctioning Location
Cross (x): Communication error DTCHyphen (-): Communication error DTC (may or may not be displayed)Asterisk (*): No display or no operation
*1
If "None ACU" is displayed on the information display, no DTC is displayed.
*2
If "None EATC" is displayed on the information display, no DTC is displayed.
A
Possible cause
- Connector terminal disconnection, poor contact, damage, deformation, corrosion
- Open circuit in wiring harness between information display and branch A
- Information display malfunction
System wiring diagram
Inspection item
- Information display connector
- Wiring harness between information display terminal J and branch A
- Wiring harness between information display terminal L and branch A
- Information display
B
Possible cause
- Connector terminal disconnection, poor contact, damage, deformation, corrosion
- Open circuit in wiring harness between audio unit/car-navigation unit and branch A
- Audio unit/car-navigation unit malfunction
System wiring diagram
Inspection item
- Audio unit/car-navigation unit connector
- Wiring harness between audio unit/car-navigation unit terminal 1O and branch A
- Wiring harness between audio unit/car-navigation unit terminal 1Q and branch A
- Audio unit/car-navigation unit
C
With SIRIUS satellite radio system
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 branch B and SIRIUS satellite radio unit terminal 2L
- Wiring harness between branch B and SIRIUS satellite radio unit terminal 2K
- SIRIUS satellite radio unit
With SIRIUS satellite radio system and hands-free telephone system
Possible cause
- Connector terminal disconnection, poor contact, damage, deformation, corrosion
- Open circuit in wiring harness between branch B and SIRIUS satellite unit
- SIRIUS satellite radio unit malfunction
System wiring diagram
Inspection item
- SIRIUS satellite radio unit connector
- Wiring harness between branch B and SIRIUS satellite radio unit terminal 2L
- Wiring harness between branch B and SIRIUS satellite radio unit terminal 2K
- SIRIUS satellite radio unit
D
Possible cause
- Connector terminal disconnection, poor contact, damage, deformation, corrosion
- Open circuit in wiring harness between branch A and connector C-10
- Open circuit in wiring harness between connector C-10 and branch B
- Connector C-10 malfunction
System wiring diagram
Inspection item
- Connector C-10
- Wiring harness between branch A and connector C-10
- Wiring harness between connector C-10 and branch B
E
With SIRIUS satellite radio system and hands-free telephone system
Possible cause
- Open circuit in wiring harness between branch B and branch C
System wiring diagram
Inspection item
- Wiring harness between branch B and branch C
Without SIRIUS satellite radio system
Possible cause
- Connector terminal disconnection, poor contact, damage, deformation, corrosion
- Open circuit in wiring harness between branch A and connector C-9
- Open circuit in wiring harness between connector C-9 and branch B
- Connector C-9 malfunction
System wiring diagram
Inspection item
- Connector C-9
- Wiring harness between branch A and connector C-9
- Wiring harness between connector C-9 and branch B
F
Without SIRIUS satellite radio system and hands-free telephone system
Possible cause
- Connector terminal disconnection, poor contact, damage, deformation, corrosion
- Open circuit in wiring harness between climate control unit and branch A
- Climate control unit malfunction
System wiring diagram
Inspection item
- Climate control unit connector
- Wiring harness between branch A and climate control unit terminal J
- Wiring harness between branch A and climate control unit terminal L
- Climate control unit
With SIRIUS satellite radio system
Possible cause
- Connector terminal disconnection, poor contact, damage, deformation, corrosion
- Open circuit in wiring harness between branch B and connector C-10
- Open circuit in wiring harness between connector C-10 and climate control unit
- Climate control unit malfunction
System wiring diagram
Inspection item
- Climate control unit connector
- Wiring harness between connector C-10 and branch B
- Wiring harness between connector C-10 and climate control unit terminal J
- Wiring harness between connector C-10 and climate control unit terminal L
- Climate control unit
With hands-free telephone system
Possible cause
- Connector terminal disconnection, poor contact, damage, deformation, corrosion
- Open circuit in wiring harness between connector C-9 and branch B
- Open circuit in wiring harness between climate control unit and connector C-9
- Climate control unit malfunction
System wiring diagram
Inspection item
- Climate control unit connector
- Wiring harness between branch B and connector C-9
- Wiring harness between climate control unit terminal J and connector C-9
- Wiring harness between climate control unit terminal L and connector C-9
- Climate control unit
With SIRIUS satellite radio system and hands-free telephone system
Possible cause
- Connector terminal disconnection, poor contact, damage, deformation, corrosion
- Open circuit in wiring harness between branch C and connector C-9
- Open circuit in wiring harness between connector C-9 and climate control unit
- Climate control unit malfunction
System wiring diagram
Inspection item
- Climate control unit connector
- Wiring harness between branch C and connector C-9
- Wiring harness between climate control unit terminal J and connector C-9
- Wiring harness between climate control unit terminal L and connector C-9
- Climate control unit