N REG VAUXHALL CORSA CENTRAL LOCKING NOT WORKING

Got the right button?
The boot latch may be a separate button on the remote.

Failing that check the tailgate lock relay (K24f) - temp swap with K24d (deadlock relay) should work.

If that is not it, it may be a defective microswitch on the tailgate handle.

http://www.thecorsa.co.uk/electrical-tutorials/569-corsa-c-fuse-listing.html

https://manuals.co/workshop/opel/corsa/opel-corsa-1997-2000-workshop-manual-haynes/5530701/3

You might have just blown the fuse, otherwise it could be the control module wiring has been damaged.
Check tthe wiring in the manual above.

put key in ignition turn key to number 2 lights on dash battery etc. then press the fob. till the doors lock then it is rest.

Try the following in this order
1) Try all locks on all doors with key
2) Try all locks with spare key.
3) Remove window weather strip if possible and use a hooked wire, such as a coat hanger and force it down, beside the window into the door and fish around for the catch mechanism and pull.

Is the battery dead by chance, sounds like that may be the problem here.

its a bad lock assembly

Opel/ Vauxhall Corsa D fuse box diagram and descroption

Version 1
http://www.autogenius.info/en/vauxhall-corsa-d-fuse-box/

Version 2
http://www.autogenius.info/en/vauxhall-corsa-d-2009-fuse-box/

It`s the reverse light switch under the bonnet had to replace it on my 16v t reg corsa costs about 8-£10 and comes off easily because it`s just a bolt with electricals leading to the back lighting. This happens on every Corsa. Let me guess Your Heater control lights and fan swich lights have gone too on the interior. Any problem corsa related, been there done it.

Yes. You can get the MOT station to do the repair or you can try and solve the problem. Check your fuses, the earth connections, your wiring and the voltage at the bulb. It could also be a faulty switch. I hope some of that will help.