Diagnosis continues ....
Using the blade key, drove the car into town. Remotes work again.
On return home, the remote for the garage has frozen.
When parked again outside the garage, the remote for the Jeep no longer works.
Looks like the Jeep use a frequency common with other devices.
This is a common problem. If your remote doesn't work on the Jeep, could be the area, not the car.
This blogspot was helpful, particularly with other links in it.
TROY'S BLOG: REMOTE INTERFERENCE