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If your trunk won't open by pushing the buttons... Disconnect the negative side battery cable for 5 minutes. Then reattach it. The truck will usually open after that. The trunk lock mechanism usually needs to be replaced $300 or so for the part. It is a fairly common issue on the ls460.
I dont know about lindgilb's problem but i feel my trunk switch is gone bad as it is a very common issue and i replaced my battery just one month back now i am confused if i should go for a used part or buy a new one any idea if this problem was similar in 2011 2012 models i am asking this because then i will look for the later model part and replace it with it