How to Fault Find Canbus Issues
Check each vehicle function separately
Record the decoder label, registered protocol/version and exact original vehicle equipment. Door data or reverse activation working does not prove steering, climate, parking audio or factory settings are supported.
Do not choose a protocol from a similarly named vehicle as a general fix. If a change only works briefly, record the recurrence and contact support. Registration confirms communication information; it does not certify every factory feature is retained.
The most common issue is that the C port is not plugged in or plugged in but not seated correctly. Sometimes a simple swipe down on the screen and selecting "reboot" will rectify the issue.
The second most common issue is that some people go into "Enter TEYES APP" instead of "Enter CANBUS settings"
The third most common issue is that even if correctly going into "Enter CANBUS Settings" setting the incorrect canbus will not work and also in a few situations, show the canbus registration as "no protocol". Once setting the correct setting, it will show as registering.
1) Make sure this connection is made and properly fitted with the canbus connected.
- Take special note to check the related wires for any loose connections or bent pins. You can very gently pull on the wires to make sure they are terminated securely
2) Next check that the canbus is registering on the device
3) You can also enable the canbus protocol print to see the read out from the canbus. When you press your steering controls you should see unique data changing which means data is being transmitted.
Go to Settings --> Factory Settings --> Enter 168 --> Original Car Agreement --> Protocol Print
4) If all the above checks out but your steering or A/C controls are not working. Most of the time there is a bug blocking it. It can be cleared by doing a factory reset.
Vehicle-specific confirmed outcomes
These outcomes were confirmed by customers for the installations described. Check the vehicle, decoder and head-unit details before applying a setting or replacing a part.
Honda Jazz (2016), CC3 2K: steering controls and dynamic lines
Symptom: Steering controls did not register for learning and reverse guidelines stayed static.
Confirmed outcome: The customer confirmed that updating the CAN settings through the TEYES app restored steering controls and moving reverse guidelines.
What to check: Have support check the CAN configuration for your decoder and vehicle. CAN steering controls and analogue resistive key learning use different setup methods.
Applies to this recorded installation: The exact decoder, selected profile and changed values were not recorded. This case does not provide a universal profile or confirm that a decoder replacement is needed.
Ford Transit Custom (2020), CC4L: reverse trigger and interface faults
Symptom: The original camera could be viewed manually but reverse did not trigger automatically. Later symptoms included stuck overlays and incorrect side-key behaviour.
Confirmed outcome: The customer confirmed that replacing the installed Hiworld decoder with a Raise decoder resolved those interface faults. The original microphone remained unavailable.
What to check: Ask support to assess the decoder, vehicle trim, factory Sync system and harness as a matched package before ordering replacement parts.
Applies to this recorded installation: The fitted Raise part number and final wiring were not established. This is not a recommendation to replace every Hiworld decoder, and it does not confirm original-microphone retention.
Kia Sportage QL (2019), CC4 Pro: instrument-cluster language
Symptom: The original instrument display changed language after a battery reset and the previous setup control was unavailable.
Confirmed outcome: The customer confirmed restoring the language through the head unit’s original-car-settings app.
What to check: On a supported vehicle integration, check whether the original-car-settings app exposes the cluster language control. Ask support if that option is missing.
Applies to this recorded installation: The exact menu path and final CAN configuration were not recorded. This does not establish that all factory settings are available on every Sportage or resolve other vehicle-control faults.