Question about Pioneer DEH-P4100

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"Down volume" button on Pioneer head unit in my '05 Scion broken

I have a Pioneer factory head unit in my '05 Scion xB. The "volume down" button stopped working out of the blue. Nothing has been spilled on it, all other buttons work. Any ideas?

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  • eprice May 12, 2009

    i guess my switch needs to be fixed, then. no clicking...
    thanks very much for your help!

  • eprice May 18, 2009

    thank you, mcj78 – i was thinking about doing that but didn't want to take it all apart if it was pointless. now i know someone else has done it with success, i'm more inclined.

    i checked a junkyard to see about replacing the unit and they said the part would be $290. not really an option at the moment, so i think i'll try taking mine apart instead.


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I had a similar problem with one of the cursor type keys - I ended up taking the face apart (4 small screws on the back then gently prise apart) & discovered the small pin attached to the back of the button which presses the internal switch had slipped off the pad, it took a couple off attempts to put it back together again but once it was re-assembled it was fine, just be careful not to lose anything! ;)

Posted on May 15, 2009

  • mcj78 May 18, 2009

    No problem, everything will only go back in place 1 way - try and remember how it looks once you take the back off (it's easiest if you have the panel face-down as the buttons can't fall out that way!) then once you take the circut board bit off try pressing all the contact points (they're little white buttons) to see if they click when pressed - hopefully it'll be the same problem as I had where it was simply misaligned!


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Listen for click sound , the volume up will have it , if the vol down does not then you have a faulty button (internal tactile switch) which needs to be replaced. If you can hear the click then there is a communiction error between then button and the microprocessor which also needs to be taken in for a checkup.

Posted on May 12, 2009

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When my radio does this it is the same make I unhook the power to it by unhooking the battery it resets the radio but then you need to set the clock my problem

Posted on Dec 10, 2010

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