Radio Volume problem

[Djilani]

My lr3 radio volume 35 but after driving few km it say low mode and it come to 20 volume is any body know we can do it with gapiidtool
Thanks

[BradC]

That can be an indicator of low voltage. It's covered under "Electrical Load Management" in manual 412-04 Climate Control System - Control Components - Description and Operation.

There may be other stuff going on, because there's a number of inputs to the load management system, but it tells the radio to restrict it's volume as part of the load management priority system. You should be seeing an increase in idle speed in an attempt to counter that.

Need fault codes for further diagnostics.