Join Date: Sep 2005
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The actual computer part of the SAT-NAV is as you suspect in the glove box.
The problem usually is that the person disconnecting the battery does not allow for enough time after turning off the ignition for the computer to correctly power down.
A possible solution although not guaranteed, is to power up the ignition, then power down the ignition. Then wait 5 minutes and disconnect the battery again.
Wait a further five minutes and turn on the sidelights, the interior lights and reconnect the battery.
If the computer is not fried, it should reset by itself.
Currently in Jules's garage:
2005 Laguna Initiale 2.2 DCI Hatchback