Acura 2010 RL - Manual (Page 280)

The auxiliary input jack is inside the
console compartment. The system
will accept auxiliary input from
standard audio accessories. When you plug in a mini-jack cable
between a compatible audio unit and
the jack, you will see AUX in the
display and the system automatically
switches to AUX mode.
Auxiliary Input Jack
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AUXILIARY INPUT JACK
2010 RL