Determining Malfunctioning Part (HS-CAN) - Multiplex Communication System
DETERMINING MALFUNCTIONING PART (HS-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 CAN system-related module DTCs and the failed module using the M-MDS.
2. Look for a DTC display pattern and failed module display pattern in tandem which match.
NOTE:
- A hyphen " - " in the DTC output pattern table indicates that the DTC may be displayed depending on the malfunction detection conditions. If only an " x " is indicated, it means the DTC will not be displayed.
- If any of the following DTCs is displayed alone, perform the applicable DTC inspection. Multiplex Communication System - DTC Table
- ABS HU/CM: U2023
- DSC HU/CM: U2023
- Keyless control module: U2023
- Instrument cluster: U2023
3. Refer to the matching tandem diagnostic results (A to J) 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 displayed
*1
AT
*2
Vehicles with ABS
*3
Vehicles with DSC
*4
Vehicles with power retractable hardtop system
*5
Vehicles with advanced keyless and start system
A
Possible cause
- Connector terminal disconnection, poor contact, damage, deformation, corrosion
- Open circuit in wiring harness between PCM and branch A
- PCM malfunction
System wiring diagram
Inspection item
- PCM connector
- Wiring harness between PCM terminal 1AM and branch A
- Wiring harness between PCM terminal 1AI and branch A
- PCM
B
Possible cause
- Connector terminal disconnection, poor contact, damage, deformation, corrosion
- Open circuit in wiring harness between TCM and branch A
- TCM malfunction
System wiring diagram
Inspection item
- TCM connector
- Wiring harness between TCM terminal 1G and branch A
- Wiring harness between TCM terminal 1C and branch A
- TCM
C
Possible cause
- Connector terminal disconnection, poor contact, damage, deformation, corrosion
- Open circuit in wiring harness between ABS HU/CM and branch A
- ABS HU/CM malfunction
System wiring diagram
Inspection item
- ABS HU/CM connector
- Wiring harness between ABS HU/CM terminal Z and branch A
- Wiring harness between ABS HU/CM terminal Y and branch A
- ABS HU/CM
D
Possible cause
- Connector terminal disconnection, poor contact, damage, deformation, corrosion
- Open circuit in wiring harness between DSC HU/CM and branch A
- DSC HU/CM malfunction
System wiring diagram
Inspection item
- DSC HU/CM connector
- Wiring harness between DSC HU/CM terminal X and branch A
- Wiring harness between DSC HU/CM terminal W and branch A
- DSC HU/CM
E
Possible cause
- Connector terminal disconnection, poor contact, damage, deformation, corrosion
- Open circuit in wiring branch A and connector C-08
- Open circuit in wiring connector C-08 and branch B
- Connector C-08 malfunction
System wiring diagram
Inspection item
- Connector C-08
- Wiring harness between branch A and connector C-08
- Wiring harness between connector C-08 and branch B
F
Possible cause
- Connector terminal disconnection, poor contact, damage, deformation, corrosion
- Open circuit in wiring power retractable hardtop control module and branch B
- Power retractable hardtop control module malfunction
System wiring diagram
Inspection item
- Power retractable hardtop control module connector
- Wiring harness between power retractable hardtop control module terminal 1S and branch B
- Wiring harness between power retractable hardtop control module terminal 1U and branch B
- Power retractable hardtop control module
G
Possible cause
- Connector terminal disconnection, poor contact, damage, deformation, corrosion
- Open circuit in wiring harness between branch B and connector C-08
- Open circuit in wiring harness between connector C-08 and connector C-05
- Open circuit in wiring harness between connector C-05 and branch C
- Connector C-08 malfunction
- Connector C-05 malfunction
System wiring diagram
Inspection item
- Connector C-08
- Connector C-05
- Wiring harness between branch B and connector C-08
- Wiring harness between connector C-08 and connector C-05
- Wiring harness between connector C-08 and branch C
H
Possible cause
- Connector terminal disconnection, poor contact, damage, deformation, corrosion
- Open circuit in wiring harness between keyless control module and branch C
- Keyless control module malfunction
System wiring diagram
Inspection item
- Keyless control module connector
- Wiring harness between keyless control module terminal 4AA and branch C
- Wiring harness between keyless control module terminal 4Z and branch C
- Keyless control module
I
Possible cause
- Connector terminal disconnection, poor contact, damage, deformation, corrosion
- Open circuit in wiring harness between branch C and connector C-11
- Open circuit in wiring harness between connector C-11 and branch D
- Connector C-11 malfunction
System wiring diagram
Inspection item
- Connector C-11
- Wiring harness between branch C and connector C-11
- Wiring harness between connector C-11 and branch D
J
Possible cause
- Connector terminal disconnection, poor contact, damage, deformation, corrosion
- Open circuit in wiring harness between instrument cluster and branch D
- Instrument cluster malfunction
System wiring diagram
Inspection item
- Instrument cluster connector
- Wiring harness between instrument cluster terminal 1J and branch D
- Wiring harness between instrument cluster terminal 1L and branch D
- Instrument cluster