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| D2 - Sat Nav, ICE, Audio & TV All in car entertainment discussions |
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#1
11th June 2012, 05:25 PM
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Constant humming noise with RNS on
Bit of a weird one this. I have noticed it before so I think it's been there a long time......
Basically with the RNS-C (+Bose) switched on there's a constant background hum. I noticed it again today as I was in the car to program some "waypoints" into the SatNav so nothing was else switched on, no key in the ignition. The volume is constant and doesn't vary with ANY of the audio controls (volume, balance, fade, whatever). When driving you don't notice it due to other background noises. Just wondered if anyone else had this, knew what it was and if it's a concern? 
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions and extended leather. Ski hatch retrofit. Aftermarket reversing camera. DVB-T and XCarlink now removed as redundant. 2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation".  (Even rarer than a D2 S8!) Oh, and a brand new engine at just under 30,000 miles on the factory one!  Finally: gone, but not forgotten..... 1998 D2 PF S8. Agate Grey/Platinum. Every option (I think) except electric rear seats, Tiptronic steering wheel, ski hatch, towbar & dimming door mirrors. e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course.  (internal dimming mirror added later)1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon. Added Auto-dim mirror, Leather seats, Trip computer, Cruise control, OEM Ford SatNav with CD changer. And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850! 
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#4
11th June 2012, 06:06 PM
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Definitely NOT a fan or anything else like that; it comes out of the speakers and NOTHING is on apart from the RNS - and it goes when RNS is switched off.
No bluetooth, though I do have a factory handsfree phone installed - handset was not there. Something to test...
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions and extended leather. Ski hatch retrofit. Aftermarket reversing camera. DVB-T and XCarlink now removed as redundant. 2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation". (Even rarer than a D2 S8!) Oh, and a brand new engine at just under 30,000 miles on the factory one! Finally: gone, but not forgotten..... 1998 D2 PF S8. Agate Grey/Platinum. Every option (I think) except electric rear seats, Tiptronic steering wheel, ski hatch, towbar & dimming door mirrors. e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course. (internal dimming mirror added later)1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon. Added Auto-dim mirror, Leather seats, Trip computer, Cruise control, OEM Ford SatNav with CD changer. And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850!
Last edited by HPsauce; 11th June 2012 at 06:20 PM.
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#5
11th June 2012, 06:14 PM
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Hmmm, just tested with the phone handset in place.
Hum is still there, on all inputs (Radio, CD, TV, Aux) and at all volume settings, BUT when I make a phone call and it switches to the phone audio (e.g. ringing out) the hum goes. I don't know much about how that works though, I'm sure I read somewhere that there's a separate speaker for the phone in the drivers door and when activated the main speakers are cut off. That "suggests" it's possibly something to do with the (Bose) amplification to the main speakers.
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions and extended leather. Ski hatch retrofit. Aftermarket reversing camera. DVB-T and XCarlink now removed as redundant. 2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation". (Even rarer than a D2 S8!) Oh, and a brand new engine at just under 30,000 miles on the factory one! Finally: gone, but not forgotten..... 1998 D2 PF S8. Agate Grey/Platinum. Every option (I think) except electric rear seats, Tiptronic steering wheel, ski hatch, towbar & dimming door mirrors. e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course. (internal dimming mirror added later)1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon. Added Auto-dim mirror, Leather seats, Trip computer, Cruise control, OEM Ford SatNav with CD changer. And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850!
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#6
11th June 2012, 07:21 PM
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Couple of thoughts:
Have you had a look at the BOSE amp and connector? We had a customer with a similar interference problem a couple of months back and water had found its way into the well where the Amp sits (beneath the CD changer) and most of the wires on the Bose amp connector were corroded and nasty looking. They were all still in tact and connected but in poor shape - he patched in a good connector with a foot or so of wire to eliminate any of his old corroded copper and his problem was fixed. Another thing I would check is on the back of the head unit itself there is a spade connector for an earth wire - this sometimes gets left off and can also cause an annoying interferency type problem.
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At Work to Break: 2001 TT 8N 1.8T Quattro with a loud exhaust! 2000 A8 D2 3.7Q Non Sport Ming Blue 1999 A8 D2 4.2Q Non Sport Santorin Blue 2002 A6 C5 Allroad 2.5 TDi Silver with Black Leather 2001 A2 1.4 TDi 2006 A6 C6 2.4 Quattro Avant Canyon Red At Work to Drive: 1997 S8 Pearl White Solar Roof, Electric Heated Rear Seats, Blinds, Bose, Cruise, Headlamp Wash, Ski Hatch 1998 Audi Cabriolet 2.6, Air Con, Electric Roof, Leather, Hard Top, Headlight Wash 2008 Fiesta Sportvan x2 2002 Transit 2.4 LWB 2007 VW Crafter Recovery Truck 2013 VW Caddy Highline, DAB, Heated Seats, Touch Screen Stereo, Headlamp Wash and Webasto with Telestart 2010 RS6 Daytona Grey, Twin Pane, Sunroof, Adaptive Cruise, Soft Close and some extra horses. At Work to Hire: 4x 6 Berth Sunlight Motorhomes
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#7
11th June 2012, 09:28 PM
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Thanks David,
I'm pretty sure it's all fine around the Amp itself as I was looking in there not long ago to see where to connect in a DVB-T tuner (not yet started on that), but I'll check again. As for the earthing on the head unit, that's obviously worth checking. Presumably it has to come out? I have the very late PF RNS-C which is rectangular and have absolutely no idea how to pull it out - is there a write-up somewhere?
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions and extended leather. Ski hatch retrofit. Aftermarket reversing camera. DVB-T and XCarlink now removed as redundant. 2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation". (Even rarer than a D2 S8!) Oh, and a brand new engine at just under 30,000 miles on the factory one! Finally: gone, but not forgotten..... 1998 D2 PF S8. Agate Grey/Platinum. Every option (I think) except electric rear seats, Tiptronic steering wheel, ski hatch, towbar & dimming door mirrors. e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course. (internal dimming mirror added later)1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon. Added Auto-dim mirror, Leather seats, Trip computer, Cruise control, OEM Ford SatNav with CD changer. And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850!
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