CAN communication Circuit Inspection

WARNING: This page is about a different car, the 2018 Hyundai Accent. However, it is still accessible from the selected car via links, so may be relevant.

Connect all unit/module's connector.
IG key "ON", Engine "OFF".

Measure the voltage between the terminal of BCM* harness connector and Chassis Ground as below.

Item	Normal Value	Prerequisite condition	(+) Probe	↔	(-) Probe
B-CAN High Open/Short: Voltage	Below 5V (1.5V~3.5V)	Ignition switch: ON All unit/module's connector: Connect	BCM*_"B-CAN High"	↔	Chassis Ground
B-CAN Low Open/Short: Voltage	Below 5V (1.5V~3.5V)	Ignition switch: ON All unit/module's connector: Connect	BCM*_"B-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 and Battery Power.
- If the measured value is Ground Level (0V),
  → Repair Short between "B-CAN High" line and "B-CAN Low" line.
  
  → Repair Open/Poor Contact in the harness.
  
  → Repair Short between the harness and Chassis Ground.
NOTE: BCM*: "BCM"