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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 09-14-2013, 04:44 PM
Antidogma Antidogma is offline
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Mein Auto: 2008 328i Sedan
Aftermarket car stereo goes dead at ignition

A year ago I install an aftermarket car stereo on my 2008 328i. I had the base sound system, so I was able to upgrade speakers, amp and double-din car stereo.

A few weeks ago I have begun experiencing the following problem. Often, but not always, when I turn the engine on the car stereo goes dead. I have to manually reset it, and many times it takes several attempts. Once I restart the car stereo, all my settings (and there are many) have to be reentered.

Today, car stereo went dead while the car was parked, with the engine running at minimum RPM.

I am thinking of the possible culprits:
1. The car stereo needs to be fixed/replaced. I am still under warranty, but not for long.
2. There is a blown fuse in the fuse box.
3. The battery is bad and does not supply enough power to keep the car stereo running at ignition and when engine runs at low RPM.
4. There is a problem in some of the wiring/grounding.

Is there anyone with experience in this matter who could give me advice?

Thank you.
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  #2  
Old 09-14-2013, 05:44 PM
ctuna ctuna is offline
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I would check item 3 on your list first.

I would check item 3 on your list first.
Try putting a slow charge on your battery and see if things get better.
Also take some voltage readings and check the glass eye on your battery.
Have you been getting slow cranks by any chance.
The battery voltage could drop low enough on start to reset the radio settings is
what I am thinking.

Last edited by ctuna; 09-14-2013 at 07:22 PM.
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  #3  
Old 09-14-2013, 06:51 PM
Antidogma Antidogma is offline
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Thank you for your input. I have been worried about my car battery for a while. In fact, when I came back home in June after a month spent abroad, the battery was completely dead and I had to jump start it. So, it could very well be that a low voltage battery shuts off the radio to preserve power to the rest of the car.
I guess I will just bite the bullet and replace the battery on Monday.
Thanks again.

Quote:
Originally Posted by ctuna View Post
I would check item 3 on your list first.
Try putting a slow charge on your battery and see if things get better.
Also take some voltage reading and check the glass eye on your battery.
Have you been getting slow cranks by any chance.
The battery voltage could drop low enough on start to reset the radio settings is
what I am thinking.
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  #4  
Old 09-14-2013, 07:18 PM
ctuna ctuna is offline
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Are you going to the dealer or aftermarket ?

Are you going to the dealer or aftermarket ?
Don't allow battery back up to be used when changing the battery .
Its known to blow fuses.
You should really do some checks the battery first.

Last edited by ctuna; 09-14-2013 at 07:27 PM.
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  #5  
Old 09-14-2013, 07:38 PM
Antidogma Antidogma is offline
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Mein Auto: 2008 328i Sedan
I was supposed to change the battery back in June but I ended up hanging on to it. The problem is that I use my car mostly for short city traffic trips, and over five years I am afraid the battery is about to go. The clock often lags behind and now I have begun to see the effects on my aftermarket car stereo as well. So, even if it turns out not to be the battery, I think it is a good thing to place a new one in place anyway.
I don't want to spend $400 at the dealer, so I was thinking of going the Walmart or Sam's Club route, but I am not sure what you mean by "Don't allow battery back up to be used when changing the battery".
Thank you for all your feedback.
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  #6  
Old 09-14-2013, 08:46 PM
ctuna ctuna is offline
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Battery backup is when.

Battery backup is when. When some shops change your battery they apply a battery back up device which maintains voltage to the radio and other electronics so the settings aren't lost.
In a BMW others have reported that if this is done fuses are blown. The only data that is lost with a stock setup is the time of day and the trip computer settings . Are you aware that the battery a new battery should be registered. Also you should consider a battery tender/charger
with the use pattern you describe such as a Ctek 3300 or better . Having one is way cheaper than buying new battery's all the time.
Group 49/h8 is the most common size for a subtitute battery I think.
I have an Interstate MTP 49/h8.

Last edited by ctuna; 09-14-2013 at 08:50 PM.
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  #7  
Old 09-15-2013, 04:57 AM
Antidogma Antidogma is offline
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Aftermarket car stereo goes dead at ignition

That's lot of useful information. Thank you for that.
I definitely plan to register the new battery once I have it install it aftermarket (without back up).
Perhaps would be wise installing in a battery charger first. As you said, it might save the problem of trickle charging.
Thanks again.


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  #8  
Old 09-15-2013, 04:59 AM
Antidogma Antidogma is offline
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Aftermarket car stereo goes dead at ignition

I meant investing in a battery charger.


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  #9  
Old 09-15-2013, 09:11 AM
fdriller9 fdriller9 is offline
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Once a fuse blows, it cuts power. It rarely malfunctions and allows intermittent power.

My bet is on a loose ground or power wire. I would start with the wire that's connected directly to a 12v source. That's why keeps your presets. If that looses power, your presets are gone too. The ignition wire is a trigger and is only used to tell the system to turn on. The stereos main power wire should not be connected to ignition, which I don't think it is in your case since these issues just started happening.
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  #10  
Old 09-15-2013, 01:27 PM
ctuna ctuna is offline
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If there was a fuse blown .

If there was a fuse blown I would think the problem would be constant.
I think he said it sometimes looses its presets. When you start the car it
demands a lot of current and the voltage from the battery drops. If it drops
to a voltage to low to maintain the pre sets sometimes that would kind of describe
whats happening .
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  #11  
Old 09-16-2013, 09:15 AM
Antidogma Antidogma is offline
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Ctuna got it right, thank you. It has been more than 24 hour without a hitch since a reset problem.
My Jehnert speakers are humming again!
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  #12  
Old 09-16-2013, 10:26 AM
ctuna ctuna is offline
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Did you put in a battery ?

Did you put in a battery ?
Or did you charge the one in it.
You should probably consider getting one of
those cteks tender/chargers if you maintain that driving
pattern.

Last edited by ctuna; 09-16-2013 at 10:29 AM.
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  #13  
Old 09-16-2013, 11:03 AM
Antidogma Antidogma is offline
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Location: Richmond, VA
 
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Mein Auto: 2008 328i Sedan
I have charged the car battery with a Schumacher that I borrowed from my girlfriend's father. In the meantime, I have ordered online a Ctek 7002.
I will hold onto the battery until the Ctek tells me I need to replace it.
Thanks again for your precious help.
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