The article below discusses common audio issues you may experience with your LOGIC7, standard ASK system, or both. The LOGIC7 amplifier and ASK module are used in the Rolls Royce Phantom and BMW E65, E66 models.
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THE AUDIO SYSTEM
The audio system is available in two variants, standard 6 speaker Hi-Fi, and BMW LOGIC7 also referred to as ‘Hi-Fi Professional DSP’, ‘Top Hi-Fi’ or ‘Premium DSP’.
The standard Hi-Fi system has the following configuration:
ASK Module:
– 2 Front Mid Range Speakers and Tweeters
– 2 Rear Deck Mid Range Speakers
– 2 Subwoofer Pre-outs (fed directly to Hi-Fi Amplifier)
Hi-Fi Amplifier:
– 2 Underseat Subwoofers
Summary:
Conventional analogue amplifier, analogue audio is received from the ASK module and amplified for the two subwoofer channels.
Common Failure Modes:
ASK:
– Failure of one or more front or rear deck speaker outputs, usually crackling, distorted or no audio output. This is an ASK related failure.
Hi-Fi Amplifier:
– The subwoofer amplifier is very reliable and rarely suffers any failure symptoms.
The LOGIC7 system has the following configuration:
ASK Module:
– 2 Front Mid Range Speakers and Tweeters
– 2 Rear Deck Mid Range Speakers
LOGIC7 Top Hi-Fi Amplifier:
– 1 Centre Mid Range Dashboard Speaker
– 2 Rear Door Mid Range Speakers
– 2 Underseat Subwoofers
Summary:
Digital amplifier with full DSP (Digital Signal Processing) and 7 channel graphic equaliser. The audio data is received from the ASK (Audio System Controller) via a fibre optic connection, it is decoded, processed to enhance the sound and staging effects before being converted back to analogue and fed to the internal 5 channel amplifier.
Common Failure Modes:
ASK:
– Failure of one or more front or rear deck speaker outputs, usually crackling, distorted or no audio output.
LOGIC7:
– Sub-woofer output failure, resulting in crackling, distorted or no bass output.
– One or more of the three mid range speaker output channels can suffer crackling, distorted or no audio output.
2002-2005 Pre Facelifted ASK UNIT (CD-Player)
2006-2008 Face lifted ASK UNIT (CD-Player)
Standard problems with ASK AUDIO CONTROLLER:
– crackling, static noise from front doors and rear deck speakers. No sound at all. Therefore it will affect all service sounds like:
-PDC (parking sensors) not beeping, no NAVI guide voice, door chimes, warning sounds etc.
– in some cases ask unit controller is not responding to fibre optic signals causing MOST fibre optic bus failure. But it does not mean the problem is your ask unit or Logic 7 amp, it could be any device in the MOST BUS network, to troubleshoot and find out which module is causing failure I will cover in details in my next post, stay tuned.
THIS VIDEO SHOWS HOW TO REMOVE LOGIC 7 AMPLIFIER
How to remove ASK CD PLAYER UNIT?? EASY!
LOGIC 7 TOP HIFI AMPLIFIER 2002-2008
FIRST GENERATION BAD DESIGN L7 AMPLIFIER 2001-2006:\
NOT ALWAYS FIXABLE…. 50% SUCCESS RATE.
GOOD AMPLIFIER DESIGN AFTER 2006. 4 CLIPS:
VERY GOOD SUCCESS RATE ABOUT 90%
BMW Logic7 amplifier is a fiber optic controlled amplifier with FIBRE OPTIC CONTROLLER AND HIGH SPEED 24 BIT DSP PROCESSOR, therefore you can not install regular aftermarket amp. It produces 5 channels:
-sub woofers under front seats 8″ shallow type
-rear doors
-front center speaker in the dash
Any problems with those speakers are related to the AMP and have nothing to do with the speakers most of the times, but sometimes sub woofers get flooded and therefore can be bad, causing amplifier failure. Speakers can be easily tested: it should show about resistance=4 Ohms.
Main problem is that modules inside the amplifier overheat and die, the only way to rebuild i is to replace it, unfortunately BMW or Becker made it impossible due to non standard mini modules. we redesigned the entire system and since 2009 we did not have any returns.
Please do not even think that capacitors went bad, it never happened, but you can always check them if they are ok, before replacing it (makes sense?). But since 2009 and ~280 amps fixed none of them had bad caps.
Another problem with Logic7 amps is that when it does not sound right, those burnt modules overheat entire amplifier causing Logic board to fail, so if your amp isn’t doing well its better not to use it and fix it ASAP.
In most of the cases, APPLIES TO CARS BEFORE 2004 (AFTER 2004 THEY CHANGED SOFTWARE AND SETTINGS ARE ADJUSTABLE EVEN WITHOUT ANY AMPLIFIER CONNECTED!) if Logic7 level AND EQ SETTINGS ARE adjustable in the menu (entertainment), 
it means that logic board is still okay and it is fixable, but if you don’t have any sound, or if its cutting in and out, it means that Logic7 amplifier is causing MOST bus failure, and lots of things are not working in your IDRIVE:
-navigation isn’t working at all.
-is not showing consumption and other things.
-cd changer making noise trying to find a CD.
HOW TO BYPASS NON WORKING MODULE??? EASY!
HOW TO DIAGNOSE MOST BUS FAILURE ON ANY CAR WITH MOST FIBRE OPTIC NETWORKGET THIS P/N FROM ANY BMW DEALER 61136917541, YOU CAN GET IT ONLINE FROM ECS TUNNING ECS TUNNING FIBRE OPTIC JUMPER. YOU HAVE TO REMOVE INNER PART WITH SOME FLAT SCREWDRIVER OR A KNIFE, YOU CAN ALSO USE ZIP TIE IF YOU PLAN TO KEEP IT
In my next Post i will cover how to diagnose MOST bus failure and what device causing it, because it could be any device in the MOST bus network, and to find it out you either need bmw software and cable or i will explain the way on how to diagnose it without anything.
IF YOU DECIDED YOU NEED HELP WITH REPAIR, PLEASE SEND YOUR AMPLIFIER OR ASK UNIT OR BOTH (550$X2) HERE ALONG WITH 550$ PAYPAL PAYED TO LOGIC7REPAIR@GMAIL.COM.
We have also EBAY add, so you can see real feedback.CLICK THIS LINK BELOW, MAKE A 550$ PAYMENT, PRINT A RECEIPT AND INCLUDE IT IN THE BOX WITH YOUR AMPLIFIER OR ASK UNIT AND SEND IT TO OUR ADDRESS (SEE BELOW). USUALLY IT TAKES 1-2 DAYS TO REBUILD IT AND 2-3 DAYS SHIPPING. INEXPENSIVE AND FASTEST SHIPPING IS USPS PRIORITY MEDIUM OR LARGE BOX (15$).
if your car facelifted 2006 and up, its 99% guaranteed its fixable.
before 2005 logic7 amplifiers are not always fixable, so if you have cutting in and out, or it plays only from front speakers and Logic7 level is not adjustable, most likely we cannot help, but you can still bypass it and install standard amp, though it will not sound like original one, though much cheaper.
IF YOU ARE STILL HAVING PROBLEMS DIAGNOSING YOUR AMP FAILURE PLEASE GIVE US A CALL OR TXT IF NO ANSWER, SO WE WILL CALL YOU BACK, BUT PLEASE READ THE ARTICLE FIRST, IT EXPLAINS A LOT IF NOT EVERYTHING.
NOTE: If you don’t have any sound and cannot see NAVI, FM stations, CD tracks changing or playing, it means you have at least one device failure in the MOST network and you have to find out which one (most common are: NAVI, SVS, CD changer, ASK, L7, FM tuner) is causing this problem, i will be describing it in my next post.
Im sure I need a replacement on repaired L7 amp. Please email me and or message. 2007 750 li seanbmartin@hotmail.com
sure we can do it
I have a 2006 750i which I purchase from someone my Bluetooth module was missing which I replace . The problem is my radio or nothing comes on I did notice another component is missing from the very back which could be the tuner don’t rightfully know what goes there it has a two prong plug and optic fiber connector but anyway I have tried using the loop but cant get radio stations on display or no sound of any kind would u please advise thanks.
you need to find out where the signal is lost, you need to get red light in the end of the loop -glovebox last enpoint
Will a used logic 7 amp work as plug in and play or will it need to be coded in order to work. If you guys provide a replacement will it too needs to be coded and by who? Thanks
it wil work as is, but bmw recommends coding since glitches are possible
Read LED red light system check per your site and found solid red light on AMP but no yellow light on AMP, red LED is present prior to amp and after amp just no Yellow ,Help !
means amp is not responding
I have a 2003 BMW 745I with logic system. I have just a question about the speakers in the rear doors. When I play certain music it screeches or sounds terrible only from the that location. I sent you my amp last year and you fixed it :). My question do I have to fix my ask unit now as well? Everything else works fine just the speakers in the rear doors sounds staticy.
amplifier is the problem
Hi. You might have already answered this in a previous comment but i pretty have the normal issues of the logic7 failure like subs dont work, speakers are very tinny and they get worse sounding the longer the radio is on, rear pass door speaker is not working. I can adjust the logic 7 from the menu, there is no fault codes and when on for a little while the unit gets up to about 120 degrees according to my diagnostic scanner. It seems that the main difference is that the NAV just shows a blank screen, and Nav DVD player has no power light on. My first question is, is the AMP bad or should i figure out the nav problem because that might be causing the logic7 amp to act funny or is the amp causing the NAV to act funny, or is it 2 problems? My second question is, if i have you fix the amp will the speakers work fine without the nav? Thanks for your help
first check if navi unit gets 12V, and if it does, it means its bad
Hello I Have 2004 bmw 645ci smg and sometimes my nevagation radio works and some times is dose. Not also it makes the heater comes on and off also the mph drops to zero so sometimes. I’m not ever sure how fast I’m going than all of a sudden it pops back on what do I do please help
your CCC unit is bad, mph drops zero due to DSC unit failure, will create an article soon about it
Hi,
My car is BMW 2006 330i . Few months back , display started showing “BMW” splash screen. I noticed that when I turn on the iginition , idrive works fine meaning display and all controls but Sound stopped working. After engine is ON, nothing works in the screen and it shows “BMW” screen. I took to a BMW independent service center and they removed the Logic7 ( as it was short circuiting the bus) and then I could use all the controls in the idrive screen. However, after 30 days again, “BMW” splash screen started showing up. I took to the BMW center and this time they asked to replace the CCC and the logic7. I have logic7 taken out and have tried multiple times the computer reset using volume + eject button, but of no use. Let me know if you have any idea or suggestion here.
yes you need another CCC unit, they go bad often
My 2008 BMW 750 LI Ask unit need to be repair how do I ship it and pay for it please help !!!
Hi I have a 2006 750 lo when I put the volume up all the way I hear crackling sound in my rear deck speakers sometimes in front drive side and also my rear sensor parking system sound “beep beep beep” sound used to be loud , now I can barely hear it and only on the passenger rear….any suggestion on what the problem might be or how to diagnose the faulty unit?
your ask unit or radio cd player is bad and needs service, email and we can help or send it over