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Old 4th July 2024, 09:57 AM
Toblahoe Toblahoe is offline
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Join Date: Apr 2023
Posts: 21
Default B&O tweeters won't rise but gears are fine

Hey all, been doing tonnes of little odd jobs on the S8 recently and managed to get a lot sorted aside from the tweeters.

Since buying the car both tweeters haven't raised or lowered, a VCDS scan shows a motor fault for both. Reading about the little gears I removed both and opened them up to discover that the gears are absolutely fine, no broken teeth at all.

So firstly, I couldn't seem to find any concise information, are the tweeters 12v? I have a "test" bench that can output power but only 12v, I wanted to see if I could manually apply power to see if the motors do indeed work.

Secondly, what else could prevent the tweeters from raising if the gears/motors are okay? I'm assuming one of the B&O control units in the boot.

Any help is much appreciated.

2007 S8 D3 5.2 V10 - Jap Import in Daytona Grey
2004 BMW X3 2.5i Manual (Old Workhorse)

2009 S5 4.2 V8 - Phantom Black with Red leather interior
2006 A4 3.0tdi Manual - Black with Black Leather
2001 BMW 323ci 2.5i Manual
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Old 4th July 2024, 12:03 PM
steamship's Avatar
steamship steamship is offline
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Join Date: Jun 2013
Location: Londonderry, Northern Ireland
Posts: 3,040

Do you still have the results from the VCDS scan showing the exact error? The previous owner may have disconnected the motors for the tweeters so they don't go up and down.

In terms of power requirements, check out the following PDF which has detailed information on the B&O system:

60-SSP 366 Audi Infotainment Systems 05.pdf
2001 A8 D2 FL 3.7 Q - LPG Conversion, Engine: AKC, Gearbox:FBB, Colour:LY5X Aqua Blue pearl effect, Interior:WJ light beige/dark beige valcona leather with burr walnut inserts

My DIY jobs - Replaced alarm horn, Replaced Coolant Temp sensor, Updated RNS-D firmware, Installed Reversing Camera and Digital TV, Dashcam Installation, Retrofitted Rear Blinds, Auto-Dimming Rear View Mirror, Chrome Boot Struts

Sold! 2008 S8 D3 5.2 V10 - Engine: BSM, Gearbox:KLW, Colour:LY7F Suzuka Grey Pearl Effect, Interior:Black/Black with Silver/Black valcona leather with carbon atlas inserts, Bang & Olufsen, Heated windscreen, Soft-close doors, TV, DAB, AMI, Quad Zone, Auto Boot, Auto dim Mirrors, Keyless entry, PDC with rearview camera, AFS II Headlights

My DIY jobs - Fan Jet Windscreen Washers, Retrofitted Electric Side Blinds
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