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22900013A

Member Since: 23 Dec 2010
Location: Oxfordshire
Posts: 3140

2011 Defender 110 Puma 2.4 USW Keswick Green

Speakers playing up

Some of the speakers in my 110 are cutting in and out, seems to be mainly the nearside big on on the underside of the dash. If I thump the dash it comes in but immediately goes off again, sometimes comes in when going over a bump. Drivers side and both top ones seem to be working fine. I took the near side one out and everything is connected. Any pointers what else to check? Can speakers fail? I suppose I could get a voltmeter to check it's getting power. 2011 110 USW
1973 Series III 1-Ton
1972 Series III 1-Ton Cherrypicker
1969 IIA 1-Ton
1966 IIA 88"

14th Jan 2023 11:33pm

DSC-off

Member Since: 16 Oct 2014
Location: North East
Posts: 1351

2015 Defender 110 Puma 2.2 XS CSW Aintree Green

Hi, It could be the speaker, or the wiring, or the output from the head unit.
Easy first thing to try, swap the affected speaker(s) left to right. If the problem moves to the driver side, it's the speaker, replace it, or replace the pair.

If the problem stays in the same place, next easy thing to check is the wiring for physical damage behind the dash. Then unplug/ replug the radio harness connector(s). The radio will have to come out of the dash for this.

If the wiring is ok and firmly connected but still an issue, try a replacement radio, any one with modern ISO connectors, temporarily plugged into the harness.**
After that I would then use a multimeter to test continuity of the speaker wires for breaks, NOT while the radio is plugged in and switched on!

** if you haven't got an ISO lead currently, that may not be easy to do. See thread above, ref ISO adapters.

15th Jan 2023 12:39am

22900013A

Member Since: 23 Dec 2010
Location: Oxfordshire
Posts: 3140

I did check what I could see of the wiring and all seemed ok. Could be the head unit, but at least I've got something to go on. 2011 110 USW
1973 Series III 1-Ton
1972 Series III 1-Ton Cherrypicker
1969 IIA 1-Ton
1966 IIA 88"

15th Jan 2023 10:31am

22900013A

Member Since: 23 Dec 2010
Location: Oxfordshire
Posts: 3140

A bit more on this. Everything is secure at the back of the head unit, and seemingly at the speakers. But my bass speakers are now constantly cutting in and out, if I hit the dash they come back on but go off of I hit a bump in the road. I'm assuming somewhere the wires are breaking down. I don't really want to pull the dash board apart.

Any ideas? 2011 110 USW
1973 Series III 1-Ton
1972 Series III 1-Ton Cherrypicker
1969 IIA 1-Ton
1966 IIA 88"

18th Apr 2023 9:09pm

22900013A

Member Since: 23 Dec 2010
Location: Oxfordshire
Posts: 3140

I've noticed something really odd with this. With volume on full I don't really get the problem. As soon as I reduce volume I get the cutting in and out. I've tried jiggling the wires but that made no difference.

Any ideas? So I just need to see an auto electrician? 2011 110 USW
1973 Series III 1-Ton
1972 Series III 1-Ton Cherrypicker
1969 IIA 1-Ton
1966 IIA 88"

22nd Aug 2023 12:07am

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