Hi Marty!
I am also having trouble with my keyless remote on my 94 sc 400.
I turn the keyless remote on underneath the dash and press the button on the key.
The door begins to lock and unlock 5 times. When it is finished the door remains locked and you can only unlock it manually when it is finished. I tried what you suggested above but no luck. Do you think the contacts need to be cleaned in the door panel.
thanks for the help
Buck