"Communication Failure" Error Occurs While Using Additional Functions

Symptom

When attempting to communicate using Additional Functions on any diagnostic tool, the error message "Communication Failure" is displayed.

Cause:

This occurs when communication with the vehicle system cannot be established normally.

Solution:

1. Check the specifications of the system installed in the vehicle, select the correct system, and try again.

2. Verify that the system is properly installed in the vehicle and check the wiring connections.