Question about JVC Kw-Avx840 7 Double-Din Multimedia Receiver

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Jvc kw avx840 frozen on telephone screen. Press reset and everything works fine again until either detatch facia or switch off ignition.

Have checked that I have yellow wire perm live and red wire ign live. Once on telephone screen there is no way of coming off it other than to hit reset button. Please help. Thanks...

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Sounds very strange ... I have the exact same set. Try removing the Bluetooth dongle and re installing it again and see if this helps. Is this a new install? You r ground is good right? to the frame not just a black wire from old stereo you replaced?

Posted on Apr 23, 2014

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Posted on Jan 02, 2017

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I'm attempting to install this unit in a 1996 Volvo 850....and could use some help.


Red to accessory side of ign. Yellow to power all the time,it,s the memory wire,find a wire that's live when every thing is turned off. You will need a test light?

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Most fuse boards have a spare Perm live and Ign live.

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Check for voltage on the purple wire at the starter when turning the key to START. If no power, check for power at the purple wire coming out of the neutral switch/clutch switch. If no power, check for power coming into switch on yellow wire. If no power, check for power on yellow wire at ign switch. If no power, check for power coming into IGN switch on red wire. If no power, you've got a blown fusible link.

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you need a volt meter and 9v battery. earth black contact from meter & then
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Wire colours


Check if this applies to your Rover 

White/Blue - Perm 12v,
Yellow/Red - Switched Igntion,
Red/Black - Night time illumination,
Black - Earth

 Blue/Green & Grey/Black at ISO Connection is LH Front Door Speaker

 Red/Green & Brown/Black at ISO Connection is RH Front Door Speaker

Blue/Yellow & Grey/White is LH Rear Speaker

Brown/White & Red/Yellow is RH Rear Speaker

Power connector:
1. n/a
2. n/a
3. n/a
4. 12V permenant
5. n/a
6. n/a
7. 12V (ignition on)
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Hi and welcome to FixYa,

To my understanding, there are only 2 wires from the ignition pulse generator:
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A couple more of initial checks:
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work it out with a meter ,,,,find perm 12v feed neg and pos ---yes could be any coloured wire depending on car maker,after finding perm 12v feed for memory look for pos from ign switch,now speaker wires are easy as both will be same colour for a speaker but one will have a band through it if not sure or colour blind like yours truelly then use pos and neg on speaker wire till you hear a thump from speaker then you know you have the right wires and location of speaker ,,ie.. front left back right ect ....Now you are a fully experianced radio fitter ??

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