[neutralaction]

Hey all,

About a month ago my audio cut out, no music, no seatbelt chime (slight blessing), no BT calls. This happened at the same time as the SOS alert.

I did as much reading as I could, checked the fuses, all were good, picked up a MOST loop and got to testing.

My MOST diagnostic port is under the driver side kick panel and prior to bypassing any modules there was no fiber optic light at the diagnostic port. I bypassed the amp, nothing different, then, when bypassing the TCU (I only have one unit under the trunk floor, not two like many others who have posted), I saw the fiber optic light at the diagnostic port.

However, when reinstalling the diagnostic port loop piece, I still get no sound. Does anyone have any ideas? Is it possible the diagnostic port loop is bad? Is there anything else to check?

I have found a used TCU with the same part number on eBay, but I am doubtful that it will give me sound back.

Any help would be appreciated.

Thanks

[ctuna]

I believe all 330 in 06(in the US) came with Logic 7.
The most common problem with the Logic 7
sound system when you loose all sound is the amp
getting wet. Check for water on the amp first.

There are also indicator LED's on the amp that can
tell you if its working or getting a signal.

Logic 7
http://www.bmwlogicseven.com/?p=3837
http://www.e90post.com/forums/attach...2&d=1260829447
https://www.teacremotes.com/bmwgm5/
http://www.google.fr/url?sa=t&rct=j&...slMu2A&cad=rjt
https://www.bmwgm5.com/Logic7_E90_91_92_93.htm
http://www.bimmerfest.com/forums/sho...d.php?t=982666
http://www.e90post.com/forums/attach...1&d=1209780605
Most
http://www.e90post.com/forums/showthread.php?t=727663
http://www.e90post.com/forums/showthread.php?t=347222
https://www.google.com/search?q=BMW+...VCkMqy2aCK09M:
http://www.1addicts.com/forums/showt...php?p=19256760
https://www.teacremotes.com/bmwgm5/

See first link for Led indicators.

I wouldn't buy another TCU either get a Mulf 2 Hi or
this.

https://www.e90post.com/forums/showt...ight=bluetooth

https://www.ebay.com/itm/Bluetooth-U....c100005.m1851

If you replace a module it will require programming.

[Hamee69]

So i purchased an 2006 325xi and the previous owner said the nav system stopped working no power no nothing at all after the new battery was installed. I purchased the carly adapter to register the battery hoping to solve the issue. It didnt help. Ive done some research and seen prices of 5-700$ to have it sent out and repaired. Ive also seen upgrades to a cic unit costing about 700$. Do you guys think have my system upgraded to a CIC will solve my issue? This is a link to something ive found https://www.bimmer-tech.net/shop/bmw...ation-retrofit

[Nickco43]

Originally Posted by Hamee69

So i purchased an 2006 325xi and the previous owner said the nav system stopped working no power no nothing at all after the new battery was installed. I purchased the carly adapter to register the battery hoping to solve the issue. It didnt help. Ive done some research and seen prices of 5-700$ to have it sent out and repaired. Ive also seen upgrades to a cic unit costing about 700$. Do you guys think have my system upgraded to a CIC will solve my issue? This is a link to something ive found https://www.bimmer-tech.net/shop/bmw...ation-retrofit

Shameless plug

[ctuna]

You should start your own thread if you can.
Have you checked fuses?
There is a fuse in the back of the unit in addition
to the fuse behind the glove compartment.
Do diags tell you anything.
Carly should tell you something about functioning
units and non functioning ones.
It would be better if you had Inpa and Ista D
as far as getting to root causes of problems.
Describe all symtoms.
Does the Nav Light up at all ?
Till you know if the Head Unit is getting power and the amp
is working don't make any further purchases.

And don't start thinking about that box till you have this fixed.
Because if you do a more uptodate Nav the box will not work.

[Hamee69]

Originally Posted by ctuna

You should start your own thread if you can.
Have you checked fuses?
There is a fuse in the back of the unit in addition
to the fuse behind the glove compartment.
Do diags tell you anything.
Carly should tell you something about functioning
units and non functioning ones.
It would be better if you had Inpa and Ista D
as far as getting to root causes of problems.
Describe all symtoms.
Does the Nav Light up at all ?
Till you know if the Head Unit is getting power and the amp
is working don't make any further purchases.

And don't start thinking about that box till you have this fixed.
Because if you do a more uptodate Nav the box will not work.

Thank you. I have not checked fuses yet i just assumed they were ok, i know STUPID!! As far as the unit lighting up nothing happens at all. Did the force reset still nothing. Carly probably did show it but im new to it what should i look for under faults? Will it literally say navigation? The other programs you listed im def not familiar with and dont want to screw it up any more than it is. Will check fuses and get back to you thanks alot.

[Hamee69]

Originally Posted by ctuna

You should start your own thread if you can.
Have you checked fuses?
There is a fuse in the back of the unit in addition
to the fuse behind the glove compartment.
Do diags tell you anything.
Carly should tell you something about functioning
units and non functioning ones.
It would be better if you had Inpa and Ista D
as far as getting to root causes of problems.
Describe all symtoms.
Does the Nav Light up at all ?
Till you know if the Head Unit is getting power and the amp
is working don't make any further purchases.

And don't start thinking about that box till you have this fixed.
Because if you do a more uptodate Nav the box will not work.

This is a screen shot of a fault i clicked on along with the cel codes that appeared.

[ctuna]

Not familiar with Carly but it should read 6 to 10 ecus
depending on how your car is configured.
Also the bistable relay provides power to a lot of stuff.
This is more than a Stereo problem.
This is a power problem.

electical e90 pdf
http://www.google.com/url?sa=t&rct=j...,d.cGU&cad=rja
http://www.google.com/url?sa=t&rct=j...85464276,d.cGU
http://www.google.com/url?sa=t&rct=j...85464276,d.cGU

see first pdf I believe relay 30g is the bi stable relay.

https://www.newtis.info/tisv2/a/en/

[Hamee69]

Originally Posted by ctuna

Not familiar with Carly but it should read 6 to 10 ecus
depending on how your car is configured.
Also the bistable relay provides power to a lot of stuff.
This is more than a Stereo problem.
This is a power problem.

electical e90 pdf
http://www.google.com/url?sa=t&rct=j...GU&cad=rja
http://www.google.com/url?sa=t&rct=j...85464276,d.cGU
http://www.google.com/url?sa=t&rct=j...85464276,d.cGU

see first pdf I believe relay 30g is the bi stable relay.

It did read a numerous amount of ecu's more than 10 i believe. I will redo it tomorrow and screen shot that particular view. As far as relay 30g. Is that the big black on one page 17 labeled 5? I will also get a new relay and pop that in.

[ctuna]

Are you sure that you wired the battery back up correctly .
Or the other guy did.
If you use battery back up when changing the battery on these
it blows stuff up.
Might not be the relay might be something feeding it.

I would also check the battery voltage , yeah I know you
said it was new but a low battery voltage can cause you
a lot of ghost problems

Don't take stuff for granted measure it.

[Hamee69]

Originally Posted by ctuna

Are you sure that you wired the battery back up correctly .
If you use battery back up when changing the battery on these
it blows stuff up.
Might not be the relay might be something feeding it.

No im not sure. The people i purchased the car off of said the nav and radio worked before they had the battery replaced. After that it worked intermittently. It was also a backyard shop not an authorized dealership or anything. After a few days it stopped working completely.

[ctuna]

Works before the battery change doesn't work after
what's the one thing you did .
If you used battery back up to change the battery it
can blow stuff up in these cars .
Usually fuses.
Did you use battery back up?
More likely a wiring error at the battery.
I would measure the battery doesn't matter if its
new you want that out of the way.
Is there 12 volts at the OBD port?

Also the IBS system can turn off stuff it doesn't deem necessary
if it detects a low battery and the Nav is one of those things.
The IBS can really cause you to chase your tail. Read the first electrical pdf.

https://www.google.com/search?client...e90+30g+relay+

[Hamee69]

Originally Posted by ctuna

Works before the battery change doesn't work after
what's the one thing you did .
If you used battery back up to change the battery it
can blow stuff up in these cars .
Usually fuses.
Did you use battery back up?
More likely a wiring error at the battery.
I would measure the battery doesn't matter if its
new you want that out of the way.
Is there 12 volts at the OBD port?

Also the IBS system can turn off stuff it doesn't deem necessary
if it detects a low battery and the Nav is one of those things.
The IBS can really cause you to chase your tail. Read the first electrical pdf.

https://www.google.com/search?client...e90+30g+relay+

Wow lots of info but after reading im with you im not sure if the garage/shop used a backup. I agree with you about the IBS but i did register the battery with carly. If i did it correctly im not sure, the only thing incould have screwed up was selection the wrong amperage. My other suggestion is the fiber optic loop. "Christmas tree effect" if one goes out they all go out. So i think i will purchase the relay and a fiber optic loop and go from there. Also test the voltage at the battery and you want me to test for 12v at the obd2 port??

[ctuna]

You need to do basic voltage checks before you do anything
with the Most Bus your logic is not sound. They changed
your battery and now you have electrical problems . If you let somebody
like autozone or a non BMW shop replace your battery they
are well known for screwing up the electrical system.
Until you can read the ECU's with Carly and they come up OK
the Most Bus is not the issue.
Don't shotgun this problem.
For a sanity check if you know somebody with another
Car you might check to see if Carly still works.
Start measuring where you have at least 12.4 Volts and where
you don't .
Did carly give you and OK?
If you can't even run diags I don't see how it could have
effectively registered the battery .
but that is not your current problem.

Maybe you should find a BMW Indy locally.
So I take it you did not put the Battery in either.

Do not take these cars to non BMW shops for anything but tires.

[Hamee69]

Originally Posted by ctuna

You need to do basic voltage checks before you do anything
with the Most Bus your logic is not sound. They changed
your battery and now you have electrical problems . If you let somebody
like autozone or a non BMW shop replace your battery they
are well known for screwing up the electrical system.
Until you can read the ECU's with Carly and they come up OK
the Most Bus is not the issue.
Don't shotgun this problem.
For a sanity check if you know somebody with another
Car you might check to see if Carly still works.
Start measuring where you have at least 12.4 Volts and where
you don't .
Did carly give you and OK?
If you can't even run diags I don't see how it could have
effectively registered the battery .
but that is not your current problem.

Maybe you should find a BMW Indy locally.
So I take it you did not put the Battery in either.

No i did not put the battery in, the previous owner brought it to a NON bmw authorized garage. I figured that was what it was at first so i ran carly and selected the battery that was installed and registered it.

[Nickco43]

Originally Posted by Hamee69

No i did not put the battery in, the previous owner brought it to a NON bmw authorized garage. I figured that was what it was at first so i ran carly and selected the battery that was installed and registered it.

Pre 03/07 CCC units fail all the time. I would replace it with a post 03/2007 CCC.

[ctuna]

I beieve Carly reads your battery voltage if it can
communicate at all .
Clear codes and rerun diags if possible .
But you will need a voltmeter to get down to details.

Also they has no power at all, to the head unit he has
a terminal 30g fail . Can't read any ECU's or DME
doesn't seems like the head unit is not the issue,
at this point.

[Hamee69]

Originally Posted by ctuna

I beieve Carly reads your battery voltage if it can
communicate at all .
Clear codes and rerun diags if possible .
But you will need a voltmeter to get down to details.

Also he has no power at all, to the head unit he has
a terminal 30g fail . Can't read any ECU's or DME
doesn't seems like the head unit is not the issue,
at this point.

11.68volts AT the battery
14.8 while running idle AT battery also here are some screen shots.

[ctuna]

Your battery voltage is low
Cold weather is hard on batterys plus you can not
let these cars set or only drive them short distances
without owning a battery tender and using it.
I would put a full charge on the battery from
the terminals under the hood .
This means a 5 hour plus charge on a trickle charger or
battery tender.
should be 12.4 or above.
As said before if the battery voltage is low it can trigger
the IBS to shut stuff off .

What are the 6 or 2 fault codes?
Did any come back after the reset?

At least its running diags today.

[Hamee69]

Originally Posted by ctuna

Your battery voltage is low
Cold weather is hard on batterys plus you can not
let these cars set or only drive them short distances
without owning a battery tender and using it.
I would put a full charge on the battery from
the terminals under the hood .
This means a 5 hour plus charge on a trickle charger or
battery tender.
should be 12.4 or above.

What are the 6 or 2 fault codes?
Did any come back after the reset?

At least its running diags today.

There were no obd faults

[Hamee69]

Originally Posted by Hamee69

There were no obd faults

The other faults were in places i didnt think would involve the nav. Such as the vanos and stuff but i didnt take a picture after i cleared so i dont remember what came back. I only screen shot the ones that had something to do with the electrical system.

[ctuna]

Battery voltage it to Low .
Put it on a trickle charger for about 5 hours plus.
and see if things improve.
Charge/Jumper points are under the hood.
If the Nav does not light up it could still be
the IBS messing with you.