'Bout to Replace Stock HU with This: Will I Be Disappoint?

[MyHero]

A cursory search of pioneer radios is that a ground fault can cause some features to fail. Try reinstalling your radio and pulling negative battery terminal for 1 minute.

Edit:
Check your owners manual, there is a post install initialization setup on pioneers, some ship from the factory with the wrong output mode enabled which will cause your issue.

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Thanks, that's very helpful- I'll bet it is down to a little electrical gremlin, I'll reset it