2005 Grand Cherokee problems

ive seen problems with 3rd ignition outputs (status output, ground while running outputs whatever you call em) not powering up at the exact same time as the ignition wire and having it cause data issues with these new chrysler canbus equipped vehicles...if they dont recieve data at the same time as the see ignition its as though the vehicles computer is not booting at the exact same time as the starting circuits....anyways use a relay with ignition1 on the module to 85 3rd ignition output(seeabove) to 86 ground to 30 and your 87 to activate your relays for starting and your interface module....this has cleared up three chrysler computer issues for me...

but who knows it might have nothing to do with your problem........