Yet another DSP Amp question (sorry)

ryushe · #1 07-09-2013, 12:36 PM

Hi guys,

I was directed here by some guys over at ZPOST, who claim you guys are pretty much the foremost experts on BMW audio systems, so here's my question.

I have an '03 Z4 with the Top-HiFi system (10 speakers, DSP). Amp has the high tweeter cut out on the right hand side above a certain (not very loud) volume, which was annoying enough I replaced the amp with a newer one I found online at another BMW forum. I pored over the RealOEM database, and according to them, the amp I got now is a 'newer' version of the one I replaced. Both part numbers are listed for Top-HiFi for my particular model car.

Old Amp: 65.126932417
New Amp: 65.126946727

Now, I replaced the old amp with the new amp, and turned the radio on. Audio works, no more cutting out on the right channel, but my head unit no longer has a menu option for DSP, and the bass sounds weak compared to the old amp. I think the new one I got is from an X3, as the part numbers match.

I've read that sometimes you have to have the amp (?) recoded to match the car, especially when it's from a different model, would that possibly be the case here? If so, is this something I can do myself somehow?

Thanks for any suggestions, as for now I'm considering going back to old amp and at least have some not very loud decent audio.

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TerminatorX5 · #2 07-09-2013, 01:05 PM

First of all - welcome to xOutpost - the best BMW forum outthere!!!

like you said, the new part number matches to your car as a newer part... and, it also cross references to the X3, while the older part is not cross referencing to the X3, maybe because the X3 was not in production at the time... the function of the DSP is reported through the system via a broadcast on the iBus, and it seems that the telegram from the new amp is not recognized by rest of the car. in absense of a cut/chaffed/nicked iBus wire, it seems that you are right, you need to tell the amp in what language to talk to the car, in your case, in the Z-speak instead of the X-speak... i just made those words up, but you get the idea...

what coding tools do you have? if any...

ryushe · #3 07-09-2013, 02:40 PM

Quote:

Originally Posted by TerminatorX5

... the function of the DSP is reported through the system via a broadcast on the iBus, and it seems that the telegram from the new amp is not recognized by rest of the car....

That's what I figured.

Quote:

Originally Posted by TerminatorX5

what coding tools do you have? if any...

Nothing overly complex. Not the BMW stuff at least. Last time I played with it (2 years ago give or take) I was able to read the amount of times the roof had been raised and lowered (different count oddly enough!), turn the radio on, etc. Forgot what the name is of it. It ran (runs?) on a laptop via an OBDII to USB/Serial connection.
I remember I tried getting the BMW stuff working in a VM, but for some reason I could never get it to work or to connect to the car. I don't know if that was user error or something else tbh.

That being said, one of these days I need to get back into that stuff, as there are a few other things I'd like to change (remote buttons, lock-and-walk-away lights, etc).

Now, assuming no coding tools whatsoever, I guess this would mean a trip to the stealer?

TerminatorX5 · #4 07-09-2013, 02:46 PM

a trip to a very friendly dealer, as they might not want to recode something... even though, there is nothing criminal about this at all... sometimes they get stupid...

but if you have the cable and those tools you were talking about, you might able to reprogram the amp - sometimes all you ned to do, is code the VIN into the module...

ryushe · #5 07-09-2013, 02:51 PM

Quote:

Originally Posted by TerminatorX5

a trip to a very friendly dealer, as they might not want to recode something... even though, there is nothing criminal about this at all... sometimes they get stupid...

but if you have the cable and those tools you were talking about, you might able to reprogram the amp - sometimes all you ned to do, is code the VIN into the module...

Would third party shops be able to do such stuff? As in that case there's a nice third party shop in Austin that owes me a favor

As for the tools, I think I never found exactly what I needed. The one I was talking about was most definitely third party, and seemed somewhat limited to what I described above, and resetting certain error codes and such. I've been looking for what would be the good stuff, but never found a good source or guide or such that actually worked.

Thanks for the info though!

admranger · #6 07-10-2013, 12:52 AM

Quote:

Originally Posted by ryushe

Would third party shops be able to do such stuff? As in that case there's a nice third party shop in Austin that owes me a favor

As for the tools, I think I never found exactly what I needed. The one I was talking about was most definitely third party, and seemed somewhat limited to what I described above, and resetting certain error codes and such. I've been looking for what would be the good stuff, but never found a good source or guide or such that actually worked.

Thanks for the info though!

If they have a GT1 or whatever the latest bmw tool is called (or equivalent), they should be able to do it.

You need to tell the amp it is in a Z4, not an X3. Should do the trick.

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