Here is little guide to use Xtool X100 pad key programmer to program Grand Cherokee 2007 remote start without pin code.
Connect Xtool X100 pad tablet key programmer with Jeep Grand Cherokee
Go to “Immobilization” and select “Chrysler”
Open Xtool X-100 pad Chrysler software V26.81
Functions available under “Auto” menu of xtool x100 pad
Read key number
Program old key
Program new key
Select “Program new keys”
Program success. No need to enter pin code!
Start vehicle with new key.