dlcoffin

Would like to know where is antenna located in my 97 ls400 for the key fob security system? My fob has new battery, but still only works extremely close to the car

pandito

The security system antenna is imprinted into the upper part of the rear window, right above the defrosters.

(Image courtesy of Club Lexus member "Kansas" from this thread).

EthanS

That photo is of a UCF10.
Are both gens of UCF20 key fob antennas in the same spot?

pandito

Should be, yes. If any of you UCF20 folks have the FSM, please confirm. From the UCS10/11 FSM (p. BE-536): The wireless door lock control system is to lock and unlock all the doors at a distance, transmitting a weak radio wave from a transmitter contained in the master ignition key. The weak radio wave (coded differently for each key) is sent to the receiver via the rear window defogger wiring from which signal is sent to the theft deterrent ECU."