The direction the vehicle is moving is displayed while the vehicle is being driven.

Cruise Control Set Vehicle Speed Display (Some models)
Warning (Display Indication)Mazda 6 Owners Manual: Intermittent concern troubleshooting
Vibration Method
1. If malfunction occurs or becomes worse while driving on a rough road or
when engine is vibrating, perform the steps below.
Note
There are several reasons vehicle or engine vibration could cause
an electrical malfunction. Some of the things to check for are:
...
Mazda 6 Owners Manual: Fuse Panel Description
Fuse block (Engine compartment)
*Some models.
Fuse block (Left side)
*Some models. ...