Ray, If it is like my VW, you just get one of the cigar lighter adapers that a 9 volt battery attaches to and plug it into the hot all the time cigar sockets and it holds all the memories. i have done this on my VW many times and it works. Now i am not sure that there is a hot all the time socket, anyone know???

TCH-43mpg
VW TDI--48
08 LS 600 HL-20
08 LX 470-16