Bass on Harmon Kardon stereo completely stopped working. Blown amp? Other ideas?

verbs · 08-29-2015, 12:09 AM

Woofers/bass just disappeared. It's all treble/mids in my car now with the Harmon Kardon stereo. I'm guessing it's a blown amp? Anything else I should be checking.

Ramos · 08-29-2015, 03:48 AM

I just posted the same thread three weeks ago.
The woofers will come back next time you start the car, it's weird .. Hadn't happened to me again since, probably a safe mode or some other malfunction but they do come back.

dfwmods · 08-29-2015, 10:01 AM

Its just overheated. It does that because the bass uses the most wattage and therefore overheats the amp the most. safety cutoff. You are in Arizona and it's August in the extreme end of high temps of in the USA.

verbs · 08-29-2015, 03:31 PM

Omg you guys are awesome thanks! I've had the car in way more heat since I've had it....surprised it took till now for this to happen.

iamdabest1 · 08-29-2015, 09:52 PM

Been happening to me as well a few times and I'm in Nyc . When you restart the car after a few mins its back to normal , definitely annoying .

omega145 · 06-22-2017, 07:01 PM

Any of you guys find this as a reoccurring issue? It only happened once before for me months ago and today it happened again. The problem was immediate after the car was off for 4 hours and hasnt resolved itself yet. Any service bulletins or anyone had this repaired?

BMWZ4 · 06-22-2017, 07:53 PM

Quote:

Originally Posted by omega145

Any of you guys find this as a reoccurring issue? It only happened once before for me months ago and today it happened again. The problem was immediate after the car was off for 4 hours and hasnt resolved itself yet. Any service bulletins or anyone had this repaired?

Nope. Still happening. On one occasion it had to sit overnight. I've had it happen four times since June '16.

orangeglim · 06-22-2017, 08:50 PM

Mine has done the same thing, two, maybe three times in the year I've had the car.

Edit: Nov' 2015 build date here.

omega145 · 06-23-2017, 09:21 AM

The audio was fine this morning. Anyone contact BMW about this?

bryan_G01 · 06-23-2017, 09:39 AM

wow, never had this happen.

Im in a june build 2015, what about you guys?

Viffermike · 06-23-2017, 01:28 PM

It's a known issue, and yes: BMW is aware. I have yet to hear about it happening on a 2017 model, which has several 'fixes' to the audio system implemented. That doesn't mean that this is among the fixes on 2017 models -- just that no one knows if it's fixed.

BMWZ4 · 06-23-2017, 04:07 PM

Quote:

Originally Posted by bryan_f22

wow, never had this happen.

Im in a june build 2015, what about you guys?

My first 235 was a Jan '15 build and it happened a few times. The one I have now was an Oct '16 build and it's happened many times.

zenmaster · 06-23-2017, 07:41 PM

Quote:

Originally Posted by Viffermike

It's a known issue, and yes: BMW is aware. I have yet to hear about it happening on a 2017 model, which has several 'fixes' to the audio system implemented. That doesn't mean that this is among the fixes on 2017 models -- just that no one knows if it's fixed.

Just happened to me (2017 M2) an hour ago.

Also sometimes the left channel doesn't work in the same manner. How do you reset iDrive while driving? There used to be a CTRL+ALT+DEL equivalent button press.

orangeglim · 06-23-2017, 07:52 PM

Quote:

Originally Posted by zenmaster

Just happened to me (2017 M2) an hour ago.

Also sometimes the left channel doesn't work in the same manner. How do you reset iDrive while driving? There used to be a CTRL+ALT+DEL equivalent button press.

I've had the left channel go out on mine too, that only happened once though. It came back after I parked for work and got in the evening to head home.

German1967 · 06-23-2017, 09:31 PM

Quote:

Originally Posted by zenmaster

Quote:

Originally Posted by Viffermike

It's a known issue, and yes: BMW is aware. I have yet to hear about it happening on a 2017 model, which has several 'fixes' to the audio system implemented. That doesn't mean that this is among the fixes on 2017 models -- just that no one knows if it's fixed.

Just happened to me (2017 M2) an hour ago.

Also sometimes the left channel doesn't work in the same manner. How do you reset iDrive while driving? There used to be a CTRL+ALT+DEL equivalent button press.

Quote:

Originally Posted by zenmaster

Quote:

Originally Posted by Viffermike

It's a known issue, and yes: BMW is aware. I have yet to hear about it happening on a 2017 model, which has several 'fixes' to the audio system implemented. That doesn't mean that this is among the fixes on 2017 models -- just that no one knows if it's fixed.

Just happened to me (2017 M2) an hour ago.

Also sometimes the left channel doesn't work in the same manner. How do you reset iDrive while driving? There used to be a CTRL+ALT+DEL equivalent button press.

Push and hold the volume button until it reboots.

Em-too · 06-24-2017, 12:57 PM

Quote:

Originally Posted by verbs

Omg you guys are awesome thanks! I've had the car in way more heat since I've had it....surprised it took till now for this to happen.

It's not related to heat. It's happened to me in 70 degree F weather car parked in the shade/garage overnight and it went out. A few others on this forum have confirmed the same. The issue is that it cannot be fixed if it can't be replicated on demand. Only work around is turning the car off, locking it and letting it sit for 5-10min.

zenmaster · 06-24-2017, 01:58 PM

Quote:

Originally Posted by Em-too

It's not related to heat. It's happened to me in 70 degree F weather car parked in the shade/garage overnight and it went out. A few others on this forum have confirmed the same. The issue is that it cannot be fixed if it can't be replicated on demand.

It's definitely not due to heat.

Quote:

Originally Posted by Em-too

Only work around is turning the car off, locking it and letting it sit for 5-10min.

So the iDrive reset did not work??

IIRC, I think it happens at start up and remains disabled until car is turned off.

zenmaster · 06-27-2017, 08:59 PM

Ok bass is dead in my car too.

omega145 · 06-28-2017, 08:06 AM

Anyone know a process that can be started to try and contact BMW about this being a common issue? Maybe somehow get a TSB going...I found an older TSB related to overheating AMP from 2008: http://www.m3post.com/forums/showthread.php?t=194133

brandonee · 07-06-2017, 11:13 AM

I've never had this happen, I'm out in CA and it's been 100+ degree days. I have the front camera go out before I have my AMP go out. Perhaps there is something in your trunk area that is holding heat against it?

XutvJet · 07-06-2017, 04:54 PM

Quote:

Originally Posted by brandonee

I've never had this happen, I'm out in CA and it's been 100+ degree days. I have the front camera go out before I have my AMP go out. Perhaps there is something in your trunk area that is holding heat against it?

It's not the heat. I had this happen once and it was a 70 degree day. The bass amp was dead on start up. I turned the car off, let it go into sleep mode, restarted, and the amp was back on.

Joe240 · 07-07-2017, 12:53 AM

My 2017 m240i had this happen twice in the past 10 months I've had it. Wasn't too hot outside, but I had the audio up when it happened.

08-29-2015, 12:09 AM	#1
verbs Captain 77 Rep 665 Posts Drives: 2015 M235i Join Date: Aug 2010 Location: Zona iTrader: (0)	Bass on Harmon Kardon stereo completely stopped working. Blown amp? Other ideas? Woofers/bass just disappeared. It's all treble/mids in my car now with the Harmon Kardon stereo. I'm guessing it's a blown amp? Anything else I should be checking.
	Appreciate 0 Tweet Quote

08-29-2015, 03:48 AM	#2
Ramos Colonel 860 Rep 2,896 Posts Drives: G20 2020 M340 Join Date: Nov 2007 Location: So-Cal iTrader: (6)	I just posted the same thread three weeks ago. The woofers will come back next time you start the car, it's weird .. Hadn't happened to me again since, probably a safe mode or some other malfunction but they do come back.
	Appreciate 0 Quote

08-29-2015, 10:01 AM	#3
dfwmods Enlisted Member 4 Rep 40 Posts Drives: 1998 BMW 740iL Join Date: Aug 2015 Location: Fort Worth iTrader: (0)	Its just overheated. It does that because the bass uses the most wattage and therefore overheats the amp the most. safety cutoff. You are in Arizona and it's August in the extreme end of high temps of in the USA. __________________ My YouTube Channel
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08-29-2015, 03:31 PM	#4
verbs Captain 77 Rep 665 Posts Drives: 2015 M235i Join Date: Aug 2010 Location: Zona iTrader: (0)	Omg you guys are awesome thanks! I've had the car in way more heat since I've had it....surprised it took till now for this to happen.
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08-29-2015, 09:52 PM	#5
iamdabest1 Second Lieutenant 128 Rep 263 Posts Drives: 2011 m3 dct Join Date: Oct 2010 Location: nyc iTrader: (0)	Been happening to me as well a few times and I'm in Nyc . When you restart the car after a few mins its back to normal , definitely annoying .
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06-22-2017, 07:01 PM	#6
omega145 Second Lieutenant 88 Rep 235 Posts Drives: 2016 M235 Xdrive Join Date: Nov 2012 Location: Long Island, NY iTrader: (1)	Any of you guys find this as a reoccurring issue? It only happened once before for me months ago and today it happened again. The problem was immediate after the car was off for 4 hours and hasnt resolved itself yet. Any service bulletins or anyone had this repaired?
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06-22-2017, 08:50 PM	#8
orangeglim Lieutenant 345 Rep 442 Posts Drives: 2019 M2C Join Date: May 2016 Location: NC iTrader: (0) Garage List 2019 M2C [0.00]	Mine has done the same thing, two, maybe three times in the year I've had the car. Edit: Nov' 2015 build date here. Last edited by orangeglim; 06-23-2017 at 04:35 PM.. Reason: added build date
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06-23-2017, 09:21 AM	#9
omega145 Second Lieutenant 88 Rep 235 Posts Drives: 2016 M235 Xdrive Join Date: Nov 2012 Location: Long Island, NY iTrader: (1)	The audio was fine this morning. Anyone contact BMW about this?
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06-23-2017, 09:39 AM	#10
bryan_G01 Lieutenant Colonel 1165 Rep 1,931 Posts Drives: like i stole it... Join Date: Jun 2012 Location: NY iTrader: (0)	wow, never had this happen. Im in a june build 2015, what about you guys? __________________ www.nybmwcca.org Current Cars: 1995 M3 Coupe Manual Alpine White 1997 M3 Sedan Auto Cosmo Black Metallic 2018 x3 m40 Auto Grey Metallic
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06-23-2017, 01:28 PM	#11
Viffermike Colonel 1753 Rep 2,942 Posts Drives: '18 black-n-blue 718 Cayman Join Date: Jan 2015 Location: Big D iTrader: (0)	It's a known issue, and yes: BMW is aware. I have yet to hear about it happening on a 2017 model, which has several 'fixes' to the audio system implemented. That doesn't mean that this is among the fixes on 2017 models -- just that no one knows if it's fixed. __________________ --Life is a journey made more exciting with a fast car.-- --Helmets are for closers.-- <<Current: "Blackened" '18 NBM Porsche 718 Cayman ... Gone (but not forgotten): "Blackened" MG '15 228i M Sport w/aFe filter/scoop, Hertz drivers, P3Cars multigauge, other goodies>>
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06-27-2017, 08:59 PM	#18
zenmaster Brigadier General 1577 Rep 3,888 Posts Drives: '17 M2 Join Date: Mar 2007 Location: Atlanta iTrader: (1)	Ok bass is dead in my car too.
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06-28-2017, 08:06 AM	#19
omega145 Second Lieutenant 88 Rep 235 Posts Drives: 2016 M235 Xdrive Join Date: Nov 2012 Location: Long Island, NY iTrader: (1)	Anyone know a process that can be started to try and contact BMW about this being a common issue? Maybe somehow get a TSB going...I found an older TSB related to overheating AMP from 2008: http://www.m3post.com/forums/showthread.php?t=194133
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07-06-2017, 11:13 AM	#20
brandonee Enlisted Member 26 Rep 39 Posts Drives: 2015 i3 REX, 2016 228 M Sport Join Date: Jan 2017 Location: Sacramento, CA iTrader: (0)	I've never had this happen, I'm out in CA and it's been 100+ degree days. I have the front camera go out before I have my AMP go out. Perhaps there is something in your trunk area that is holding heat against it?
	Appreciate 0 Quote

07-07-2017, 12:53 AM	#22
Joe240 Major 2924 Rep 1,303 Posts Drives: 2021 C8 Corvette 1LT Join Date: Jul 2016 Location: Pensacola iTrader: (0) Garage List 2020 GMC Sierra AT4 [0.00] 2019 BMW X3 M40i [0.00]	My 2017 m240i had this happen twice in the past 10 months I've had it. Wasn't too hot outside, but I had the audio up when it happened.
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