just noticed it yesterday
a red car shaped light on the dash is always blinking on 2005 Mazda Mazda6
Its your security light for ur cars anti thieft device . Its supost to blink every now and then .if it starts to blink every few seconds or so u have a problem with ur cars security system ...... possibly in wiring harness under the hood .
If its blinking when the car is off, its just indcating that the passive alarm is activated.
is the trunk up on the car -open trunk indicator
Check your owners manual for dash icon information. It will tell you what that warning light signifies so you can have the car checked.