Originally Posted by tjkj2002
The cigarette lighter plug w/ a 9v battery type of memory saver will not work on a WK,you need a memory saver that plugs into the OBDII port.
If no memory saver is used you will loose the radio memory and all "learned" memory in the pCM so the engine and trans will act a little funny for a few days until it re-learns your driving habits.
FWIW, there is a TSB on the MyGig RER & REZ radios. Pull the radio fuse before
disconnecting the negative battery lead. Stops the voltage spike to the MyGig unit when the lead is disconnected and precludes electronics failure. I remind them of this and put a copy on the front seat whenever I think the dealer will disconnect the battery for any reason. Had 2 MyGig failures and this could have been the cause.
This is for the 2008-2009 model years.
Also, what tjkj2002
said: The PCM long term and short term fuel adaptives will need to re-learn and the some of the radio pre-sets are lost. MDS was a little erratic and mpg's were down slightly for 1-2 days.