The 4 dashes would appear but not disappear, one by one on , entering the
code , so is now dead. Is there a pair of contact points somewhere inside to
do a reset or some procedure like that.

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Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list onhttp://home.graffiti.net/diverse:graffiti.net/

Some Volvo radios require that the ignition is left turned on for
thirty minutes until the four dashes start flashing.The radio will
then accept the code.