1. Remove the climate control unit.
2. Inspect for continuity between the fan switch terminals using an ohmmeter.


Climate control unit inspection
Defroster switch inspectionMazda 6 Service Manual: Intermittent concern troubleshooting
Vibration Method
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 why vehicle or engine vibration could
cause an electrical malfunction. Some of the things to check for:
- ...
Mazda 6 Service Manual: Wheel alignment pre-inspection
1. Inspect the tire inflation, and adjust to the recommended pressure as
necessary.
2. Inspect the front wheel bearing play and correct it if necessary. (See
Wheel Bearing Play Inspection.)
3. Inspect the wheel and tire runouts. (See SUSPENSION.)
4. Inspect the ball joints and steering linkag ...