You don't list a year so I will give you a general solution.
Many vehicles have a " body control module" or "illumination control module" when one of these malfunctions many systems will be affected.
Fuse 21 is the central locking & interior light fuse.
It migt be a problem with the central computer or more simply by the symptoms you describe I'll go for an alarm sytem problem
if removed and replaced properly the interior locking button should always work.
it should be in the same spot as the other fuses, but if u have a problem with your central locking you may just need to clean and lube the central locking units to get them working properly. My central locking on my 95 ef station wagon wouldn't work till i cleaned and used a bit of WD40 on the tail gate central locking unit and its been great ever since it should be in the same spot as the other fuses, but if u have a problem with your central locking you may just need to clean and lube the central locking units to get them working properly. My central locking on my 95 ef station wagon wouldn't work till i cleaned and used a bit of WD40 on the tail gate central locking unit and its been great ever since
Had the same problem on my 2000yr TD. The black wire was broke which runs between the door and A post which seems to be a common problem as its always flexing with the door opening and shutting, but I was suprised how many functions this affected!
That would be the DOOR LOCK (30A) Fuse in the Interior Fuse Panel.
If the central locking on your Peugeot 406 is not functioning properly, it could be due to a faulty actuator, a problem with the central locking module, or a wiring issue. Start by checking the fuses related to the locking system, as a blown fuse can disrupt operation. If the fuses are intact, inspect the door locks and wiring for any visible damage. If the problem persists, consider consulting a professional mechanic for a more thorough diagnosis.
above the rear view mirror near the interior light and sunroof handle, mk1 saxo vtr
Central locking on madza 2 not working
All Ford vehicles have a central locking system that were manufactured after 1993. The Ford focus has always had the central locking system.
It sounds like there may be an issue with the central locking system or the door mechanisms on your Ford Mondeo. Check the fuses related to the central locking, as a blown fuse might affect its operation. If the fuses are fine, it could be a problem with the door lock actuators or the central locking module itself. Consulting a professional mechanic may be necessary to diagnose and resolve the issue effectively.
If the central locking on your Peugeot 306 isn't working with the key, it could be due to a dead key fob battery, a malfunctioning key, or an issue with the car's central locking system. First, try replacing the battery in the key fob. If that doesn't work, check the central locking fuse and wiring for any damage. If the problem persists, it may be necessary to consult a professional for further diagnosis and repair.