CAN Communication Circuit Inspection
WARNING: This page is about a different car, the 2021 Hyundai Kona. However, it is still accessible from the selected car via links, so may be relevant.
| Item | Normal Value | Prerequisite condition | (+) Probe | <-> | (-) Probe |
|---|---|---|---|---|---|
| B-CAN High Open/Short: Voltage | Below 5V (1.5V~3.5V) |
|
BCM*_"B-CAN High" | <-> | Chassis Ground |
| B-CAN Low Open/Short: Voltage | 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/connector 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 Connection in the harness/connector.
→ Repair Short between the harness/connector and Chassis Ground.
- Disconnect B-CAN communication unit/module one by one and monitor DTC to find the cause.
NOTE:
BCM*: "BCM"