How do i change ignition switch without the key on a 2000 jeep Grand Cherokee larado i lost the old key a brought a new ignition switch key

you cant.
the skim will not let you....
the steps are in print,
in the FSM book, WJ Jeep GC.

did you use a scan tool and see the errors?
posted now 100 times.
http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service

see chapter (electronic moduels)
chapter 8e
page 21, read how it works first. and how you can do this...
by design, if it was this easy, like you are doing any goon could steel a car.

see the red here
in the event...
pg 22 (posted 100 times)

Passenger side, front of engine, where the lower hose comes out of the engine, its behind the black plastic thermostat housing that is bolted to the aluminum front timing chain cover. Two bolts hold it on, 8mm socket gets them off.

Remove the aftermarket alarm. They plague factory electronics anyways.

Try using the key and manually lock and unlock the door from the outside.

First I would check with a different dealership. you will be required to provide only the VIN and probably some verification that you own the car, but the dealership can make a key and program it without the car even being there. I hope this helps.

Have You Tried Changing The Dimmer Switch!!!
More Info If Not Good Luck !!

We Are Here To Help !!

Donald Deane MCSE,ASE,CPO

PROBLEM COULD BE DISTRIBUTOR OR CAMSHAFT SENSOR.ALSO CHECK IGNITION FUSE.

Check the ignition coil harness you may have a bad connection.When you turn the key on the relay ASD should click without the ASD relay operation expect no power to coil and even no fuel pump. Do this turn the key on and cycle the switch you should hear the fuel pump activate. If you dont check the fuse.For the coil to have no power you may have bad connection on the harness or connection.Go to the ignition coil on the B+ that is battery power apply battery power and see it it starts. If it doesnt you will need to inspect ignition control module

Same thing happened on my 2000 limited, replaced the arm (like 10 bucks I think) no more problems.

The crank position sensor is on the bell housing of the transmission, very hard to see, on passenger side, below the valve cover, depending if it is an early 2000 or a later 2000 model.