as the title really, start up today and the head unit loops into turning on and off.

Checked for water ingress but dry as a bone, tried taking the bluetooth module out by joining the fibre optics but still the same.

Any ideas?

thanks

battery ok?

Had a new Battery and alternator in Feb this year.....so I had ruled that out.

I had this last year , I replaced the head unit but it still does it after about 40 mins of driving , ive but an android head unit so will set about replacing it asap

ok thanks.

So your belief is that the fault is with the head unit rather than anything like the amp or other peripheries associated with the unit that is causing the constant reboot?

thanks

An '02 is a different kettle of fish!

However (applies to early and later models) I would have a good look at all the electronics in the left hand rear boot cubby, check all the connections, and you may need to dismantle some of the kit to check for corrosion inside. .
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I was watching Stephen Kings Christine last night. If yours plays 1950's rock and roll when it does, I would be worried...…….. Previously......
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try a battery reset, mine went into looping on and off on my 07. did it for a few days, disconnected the battery and did a battery reset and all was ok after. though whether that was the reset which did it was up for debate. There is nothing that can't be fixed with a hammer😜😜
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Mine was doing exactly the same checked everything in the boot all connections by passed each unit one after the other to check for faults all ok. I then noticed last of all when I was checking the back of the main head unit there was a TV on the move module fitted to the radio receiver behind the main touchscreen head unit I disconnected this and my stereo has been fine ever since now random restarts etc... So it was a faulty TV on the move module. Range Rover Vogue SE 4.4 SDV8 SVO Stying Pack
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I know you said no sign of water ingress but have you pulled the plugs and examined the contacts? Mine all looked bone dry but had obviously had water in there at some point in it's life because the contacts showed signs of corrosion...