Quote:
Originally Posted by Mike Noc
Yes best get back to the garage who serviced your car and check what they did.
In all the years I have worked my own cars I have never disconnected the battery when servicing - there is no need to, but if they did and didn't ensure that the satnav had shut down before doing so, that could be your problem.
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It is one of the peculiarities of the 75's system - damage to the system, I would hardly expect a none specialist garage to know not to disconnect the battery, though maybe on other cars - the radio might loose its code.