I bought a used 2008 400h recently. It has Mark Levinson audio. I replaced the factory stereo with Sony XAV100 head unit with CarPlay. Everything was working fine.
Last week the battery died. I jump started couple of times and then replaced the battery. The problem is that there is no volume. Tried radio, bluetooth, CarPlay, usb etc.
The strange thing is, if I disconnect the battery and then connect it, it works fine until next time. But when I stop the car and start again next time, there is no volume.
What could be wrong?
I followed excellent advice in post by @Mamoon here : https://us.lexusownersclub.com/forums/topic/66814-no-sound/
I have checked the fuses and they are ok.
The fact that it works every time after reconnecting battery might indicate connections are ok.