You need a body/HAVC/capable scanner to get codes.
There is several TSB's on it.
One has to do with bad wiring.
I would suggest a All data on line sub for all tsb,s and repair procedures.
24.95 US $ for a year online sub. with automatic updates on TSB's.
http://www.alldata.com/products/diy/index.html
And as always make the system has a full charge in it.