Unfortunately, the noise is inherent in the system: the lock motors are noisy themselves (not the motor itself but rather a disengaging mechanism inside), the rods and latches attached add to this, and the whole is vastly increased by the hollow door construction.
The remote control on a BX uses a TEA5500 chip for both the transmitter and receiver. This device has ten programming inputs and each input has three possible states, connected to the high or low bus or, unusually, left unconnected. This gives 59,047 possible combinations of code.
You can spare the expenses by modifying the new switch to match your original key.
The sunroof is not intended to be watertight, the water that gets through is drained by four drain pipes. The front ones are behind the plastic trim on the A pillars, the rear ones behind the C pillar trim and they usually get blocked. Never try to clean them by rodding or blowing into them, they can puncture or separate at the joints. Suck the blockage out of the pipes using a vacuum cleaner instead.
Generally, you could find out where the water is coming from judging by the traces of water or by removing the footwell carpet and asking someone to pour buckets of water onto the car. If you have a sunroof fitted, this is the first place to check. There are water drain channels in the C pillars, if one or both of them become clogged, water accumulates above the headlining and comes down generally behind the B pillar trim.
I had nothing but bad experience with Bosch wiper blades, be it revolutionary, twin, aerodynamic, whatever. I stick with Champion and Valeo. But one word of caution: when it starts to streak, never rush to buy a new one. Get some alcohol and kitchen paper towel (it's better than Kleenex). Pour some alcohol on the towel, pinch it between your fingernails and literally scrape the blade edge, but hard. Dirt can stick to it with great force. You do this twice or thrice and lo and behold, you blade will probably return to its new condition immediately.
A főtábla a bal oldalon van az alsó takarólemez alatt az utastérben, elöl. Húzza (I. sorozat) vagy fordítsa el (II. sorozat) a rögzítőkart, és lefelé eressze le a dobozt.
Ha az eső nem szakad, csak szemerkél, az ablaktörlő által a szélvédő bal aljára húzott víz a menetszél hatására felfelé áramlik, és gátolja a kilátást. Más, szintén csak egy ablaktörlőlapáttal felszerelt autókon (Mercedes) a lapát alapállásban a bal oldalon foglal helyet. Ezt a BX-en is könnyedén megvalósíthatja: szerelje le a lapátkart és a tövében levő műanyag takarólemezt. Fordítsa át a rudazat kis fémkarját 180 fokkal, így a lapát orsója az ellenkező irányban fog forogni, és a másik oldalon fog megállni.