Mark Levenson system radio only works with touch screen. The knobs will not work on 2002 Lexus LS430

I have a 2002 LS430 with Mark Levenson system. The radio works but only with on screen touch. The volume and station controls knobs do not work. I can hear the radio but cannot control anything with the knobs. It worked before the battery was changed but now it does not work properly . Do you what could be causing this problem?

Asked by for the 2002 Lexus LS430