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post #4 of (permalink) Old 2nd December 2007
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the box under the dash is probably the UCH . it can look after many things; central locking, lighting, indicators, interior lights, wiper delay etc and it is often part of immob circuit.

the key is usually in 2 eletrical parts ...ish. the first is the batt powered side that handles central locking the second is the immob. the immob power is 'induced' from the coil around the ign barrel, the immob data also goes via this coil to the UCH .

in reality it is often one chip in the key that does all. this key can only be 'blown' once (newer models) and its code goes back to the UCH and is checked against engine ECU .

hence you cannot just buy a used key from ebay can IF you replace the chip for a new unblown one and then take to renault for programming (programmed to code already set in UCH / ECU ) and get a new blade cut.
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