You will have to get a memory keeper, that is a battery (9v) that plugs into the aux power point (cig lighter) leave ignition on AUX disconnect battery and lock down clamp, ensure you remember which is Pos & Neg mark them if you are not sure, re fit battery tighten clamps and hold down and remove memory keeper, this should be all you need to do.

Answered by mhpautos (expert)
26,898 answers provided