Not familiar with the Jensen, but on the Magnadyne our coach came with - and on the Kenwood I replaced it with - the parking brake lockout sensed from a wire that connected to the parking brake switch. Can't remember which, but either leaving this wire disconnected, or connecting it to ground eliminated the lockout.
So - problem may be the wire is broken, shorted to ground, or the parking brake switch may be defective.
I did replace the Magnadyne with a Kenwood that does not have GPS, and added a standalone GPS. Much happier with the Kenwood and the Garmin.
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JLeising
2012 Solera "S"
Calif SF Bay Area
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