Our 2001 Volvo S60 has volume up/down and tune up/down (maybe change from to AM/FM) on the steering wheel.
It uses the CAN buss to pass commands to the radio.
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There was a CD bay 10 that also used the CAN Buss, it had "issues" that would randomly jam the CAN buss, ripped it out and problem solved.
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The window up/down is controlled by the CAN buss, as is the door lock, security system [which dies when the nicad pack under the right front wheel rain shield dies, which also stops the sun roof.
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The can buss controls almost everything in modern cars and maybe everything.
Our Echo being a basic car doesn't have a CAN buss and I love it!!!!!
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I hate CAN et al almost as much as the NEC lock down our rules.
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