CAN Communication Circuit Inspection

Item	Normal Value	Prerequisite Condition	(-) Probe	<->	(-) Probe
C-CAN High Open/Short: Voltage	Below 5V (1.5V~3.5V)	IG key "ON", Engine "OFF" Unit/Module connector: Connect	HUD*_"C-CAN High"	<->	Chassis Ground
C-CAN Low Open/Short: Voltage	Below 5V (1.5V~3.5V)	IG key "ON", Engine "OFF" Unit/Module connector: Connect	HUD*_"C-CAN Low"	<->	Chassis Ground

Is the voltage within specification?
YES
- Disconnect B-CAN communication unit/module one by one and monitor DTC to find the cause.
  → If the DTC erase, substitute the unit/module with an usable one, and check for proper operation.
  
  → Repair or replace the harness/connector as necessary, and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
NO
- If the measured value is Battery Voltage Level (12V),
  → Repair Short between the harness/connector and Battery Power.
- If the measured value is Ground Level (0V),
  → Repair Short between "C-CAN High" line and "C-CAN Low" line.
  
  → Repair Open/Poor Connection in the harness/connector.
  
  → Repair Short between the harness/connector and Chassis Ground.

NOTE: HUD*: "HEAD UP DISPLAY"