Since two weeks, the battery runs completely empty within a week, when my 2007 Mazda5 CR19 (Petrol, 1.8) is parked and not used.
It took the garage several hours to find out that there is a current leak in the "Room" circuit. A fuse of 15 Amps max. serves this circuit; for: the overhead lights in the interior and in the luggage compartment, the centrol locking system, and the display in the middle of the dashboard (time, radio, Fan - info etc.).
The only way to prevent the current leak now, is to remove that 15 Amps fuse when I do need the car for several days.
Doen anyone recognise this problem, and how can I proceed to detect in detail, which component leaks the current ?
Does any have a detailed drawing of this circuit?

Thanks for reacting!

 

While I am not an expert or have specific knowledge of the Mazda 5's electrical system, the first question I would have is: Is there any chance there is a light that remains on when the vehicle is parked? I had a vehicle, years ago that small children in the back seat told me that the glove box light was on when we were driving. The way you could see the light was from their angle in the back.

 

The mechanic at the garage switched off all the interior lights, and checked the lampunits and the wiring under the roof so far it could be mobilised, but the current leak remained, so it is not a (small) light that causes the leak. For the circuit has many branches, and a part of it is difficult to reach (engine bay and behind the dash) it is hard to detect the branche or wire in which the leak can be measured of followed. Thereby : the wiring of the central car lock system runs through the whole body of the car and through all the doors, and is connected to the Body Control Module (in the same housing of the Engine Control Unit). Is is also quite a puzzle to develop a strategy to find the (single?) part or location of the current leakage! But thanks for the tip: when you don't check and eliminate the simple explanations, you will never find ''the needle in the haystack''.