Lexus Troubleshooting Questions? Ask a Lexus Expert
Does the clock reset to 1:00 also?
Ok let me look at the wiring diagrams to see if there is something common between all of these things and I will get back to you this afternoon.
Does the dome light work? Do you have the MARK LEVINSON radio option?
The only thing that you have in common in these items that are losing the memory is the 15 amp number two radio fuse This is the accessory position and the causing the memory to erase if that fuse is not supplying power. Is it blown and does it have 12 volts to it? It is located in the left kick panel junction block.
That 15 amp radio number two fuse and the dome light fuse are the two fuses that control power to the radio unit to retain the memory in the system and also for the memory of the seat position. Because the dome light works that confirms that the dome light fuse is not the problem and unless there's no power at that 15 amp number two radio fuse which would be unlikely but needs to be checked there's not much more I can do for you. If both of these fuses are good you may have an intermittent power supply problem in the wiring harness somewhere between the fuse and the radio itself causing the memory to lose its preset stations. I will opt out at this point so that if there are other experts that have run into this before they can assist you further.