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I have es300h 2014, it weird that a 2014 car have no remote engin starter,
The point is, I contact lexus dealer as per thier website I can add PT39889100SS or PT39833131 and the car can do remote remote start via the smart key, but till the moment they reject to confirm which part number should I purchase,
It looks like the first P/N is the ecu it self. The 2nd P/N (PT39833131) looks to be the whole kit which includes the first P/N. You need to buy the PT39833131 one, i have installed the same kit in my car as well. You will also need to have a dealer program it or do it yourself with techstream.
Car remote starter
