Usual story... my 306 xld Mreg 120000ish on clock was working fine, until a
couple of days ago it went haywire, first thing to go was the clock,it kept
reseting itself, as did the radio, i banged the dash and pressed every
button in sight and noticed that the rear heated window button turned the
clock and radio off, next day or so the central locking intermittently
started to react in a "lazy way" as if the battery had low power, a few
days after when i turned the key the starter motor didnt do its thing(no
power to it) , so once again i hit the dash and pressed some buttons and
when i pressed the rear heated window button the clock came on and hey
presto the car started. now things have gone really downhill, i have no
central locking, radio ,clock, horn, starter motor, or courtesy lights
(however, the interior light works!?).

Ive checked all the fuses, relaysand changed the battery, also got the car
to start by touching a piece of wire from the battery to the starter motor
with the key in the second position . and since rigged up a temporary
switch to start it, but now Im lost.

I dont think its the imobilser as the fuel cut off solonoid opens to allow
the car to run, i would have expected that to stay shut but i may be wrong.
Why would so many seemingly unconnected electrical items go wrong at the
same time???

Please any suggestions no matter how simple or complex would be appreciated
very much,