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Hi Kazi and welcome to the Lexus Owners Club ! The problem your experiencing is a not infrequent one when working with after maket remote starters .As Mason said, I would put a pretty sound bet on the wiring installation of the after market starter. You say that you talked with Lexus Roadside Assistance, and that their suggestions were working. Can you elaboate? If you continue to have problems, It is frequently the action of the engine immobilizer. The immobilizer is designed to keep the engine from starting if someone tries to steal the car, the engine will not start. If your in the car and you get out to go into say a store, and you keep the FOB inyour poctet, its possible that when you get in it will die on you. I have had 3 - ES 350, all with aftermarket remote starts.Allof themhave required some fine tuning. If you keep having problems go to your installer and get the schematic from them. If they won't give it to you, go to you Lexus dealer.My dealer sells both after market remote starters as well as the factory device. I don't recomed the Lexus factory product. Paul

It's probably the aftermarket remote starter. Try removing it/disconnecting it/removing its fuse, then see if the panic alarm still goes off.

i just replaced the battery to my 2008 LS600hL myself with the top of the line replacement battery from Auto Zone designed specifically for this vehicle. It cost me about $130. And it has a 5 year warranty. It is not difficult to do. AND if you drive your vehicle to Auto Zone, they will pull out your old battery and drop in the new one for you at no additional charge. In fact, they will give you some credit for recycling your old battery.

hello: has anyone done the bulb change for the strip light on the running board? not the ones that shoot to the ground "under" the board. but the two strips of lights on the board. my driver side front one just went out. i looked at it from underside and it looks like that i might have to take the whole running board out to change the light source. is it true??? help. D.J. .