In the RTI settings, as well as turning off you can also select if the RTI starts up when the ignition is turned on.
If you fit the Legend steering wheel buttons you get control over six functions rather than four using the OEM Volvo buttons. It's a swap of the PCB inside the steering wheel. If you do the swap the RTI buttons don't work which is no big loss apart from you need to sort out keeping the screen down before changing.
The Legend volume control is also better using the replacement PCB, the steering wheel controls no longer have an effect on the factory audio system, you just set that at an optimum level and the Legend does the rest.
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