H/K Bass and Audio Failure ‘20 / ‘21? READ HERE

Technic · 12-23-2022, 11:57 AM

Quote:

Originally Posted by tester2011

Can someone point me to where the amp is actually located?

Thank you

.

sidearm1911 · 01-23-2023, 11:46 PM

I've had this issue since car pickup (2021 M440i) in Dec of 2020. Dealerships here in Korea have not been helpful at all, and say there's nothing they can do. It seems to happen more in the summer than winters. Is the RAM the problem for sure? or the amp? or the booster? Thanks, trying to solve this on my own if need be.

Technic · 01-26-2023, 09:37 AM

Quote:

Originally Posted by sidearm1911

I've had this issue since car pickup (2021 M440i) in Dec of 2020. Dealerships here in Korea have not been helpful at all, and say there's nothing they can do. It seems to happen more in the summer than winters. Is the RAM the problem for sure? or the amp? or the booster? Thanks, trying to solve this on my own if need be.

Audio issue or bass issue (HiFi) = RAM
Bass issue (HK) = Booster

sidearm1911 · 01-30-2023, 08:55 PM

Quote:

Originally Posted by Technic

Audio issue or bass issue (HiFi) = RAM
Bass issue (HK) = Booster

Thank you!!!

m340ixxx · 03-09-2023, 09:27 PM

Ordered new amp with correct index and still not working?? Do I need to reprogram? Thinking about just bringing it into service but it’s out of warranty and not trying to pay ridiculous amounts of money for something I might be able to fix. Car had HK system

Steadyhand · 03-16-2023, 01:51 PM

In the Technic harness "add a sub" for the HK system, does anyone know what music frequencies are coming through to the two-channel Wavtech LOC?

Are they low frequencies only?

Huge thanks

Technic · 03-19-2023, 09:02 AM

Quote:

Originally Posted by Steadyhand

In the Technic harness "add a sub" for the HK system, does anyone know what music frequencies are coming through to the two-channel Wavtech LOC?

Are they low frequencies only?

Huge thanks

The HK system RAM powers the mid/tweeters, the Booster powers the woofers - Booster output low frequencies only (woofers).

heylenM340 · 06-01-2023, 12:42 PM

Quote:

Originally Posted by m340ixxx

Ordered new amp with correct index and still not working?? Do I need to reprogram? Thinking about just bringing it into service but it’s out of warranty and not trying to pay ridiculous amounts of money for something I might be able to fix. Car had HK system

Same story here, did u fix it?

m340ixxx · 08-16-2023, 11:57 AM

Anyone fix?

Liotta Soda · 09-25-2023, 11:56 PM

These are on back order

MHL · 10-06-2023, 05:29 AM

Just sharing my experience. I had the same issue with my '20 G22. Idrive 7 pro with HK. Went to the dealership and they performed a firmware upgrade. (which took more them two hours, but ok...)

I don't drive the car on a daily basis, but the problem hasn't returned yet. Fingers crossed.

Liotta Soda · 10-07-2023, 08:29 PM

New booster amp installed now

Sounds better

But still sux

m340ixxx · 10-09-2023, 09:33 PM

Can you provide picture of the new one installed? Also did they reprogram ?

TuukkaJK · 11-08-2023, 07:29 AM

Quote:

Originally Posted by m340ixxx

Anyone fix?

I had the same problem. Total loss of bass. I changed the booster but it didn't help. After some diagnosing i found out that the dying booster also killed both of the subwoofers!

So i now have new booster amp and new aftermarket subwoofers and everything works again and the sound is better than before..

short24nc · 11-15-2023, 05:51 AM

Quote:

Originally Posted by m340ixxx

Can you provide picture of the new one installed? Also did they reprogram ?

Did you ever get this resolved? I have an aftermarket amp and subwoofer installed and don't feel like taking everything out and going to the dealer so I may just buy a used amp and install myself. Did you have to get it reprogramed?

Thanks

SoundHound75 · 12-13-2023, 05:28 AM

does anyone have the pinout of this booster amp?
HV5A38AB802
Thank you

Liotta Soda · 01-04-2024, 03:47 AM

Quote:

Originally Posted by m340ixxx

Can you provide picture of the new one installed? Also did they reprogram ?

Didnt take one got it back all closed up from dealer

I think they reprogrammed

Sound is way better

But still not as good as my jeep

nil98 · 02-08-2024, 07:59 AM

Has anyone fixed this themselves? Mine is just out of warranty and displaying exactly these symptoms on the drive home last night. Grrr

g20exaudinoob · 02-20-2024, 12:14 PM

I have had the exact issue on my 21MY M340. My car's software is also stuck on the 2021 version for some reason. My car is currently at the dealer and they verified both of my concerns citing 'faults left in the system' and are replacing the Amp and performing a software update, 0 out of pocket. Will see if my issue is truly corrected after picking the car up.

Also, this might be frivolous but does anyone else notice the Harmon/Kardon label not showing up on the volume adjustment? The 2024 M340i loaner provided to me does have that label.

driverg01 · 03-25-2024, 12:49 PM

Quote:

Originally Posted by nil98

Has anyone fixed this themselves? Mine is just out of warranty and displaying exactly these symptoms on the drive home last night. Grrr

I had the same issue
Went to the dealer, they did Booster flash in Ista.
Its fixed!

So no booster replaced. Running for a month without issues now.

01-23-2023, 11:46 PM	#68
sidearm1911 Registered 2 Rep 4 Posts Drives: 2021 BMW M440i Join Date: Mar 2021 Location: South Korea iTrader: (0)	Resolution I've had this issue since car pickup (2021 M440i) in Dec of 2020. Dealerships here in Korea have not been helpful at all, and say there's nothing they can do. It seems to happen more in the summer than winters. Is the RAM the problem for sure? or the amp? or the booster? Thanks, trying to solve this on my own if need be.
	Appreciate 0 Quote

03-09-2023, 09:27 PM	#71
m340ixxx New Member 2 Rep 11 Posts Drives: BMW M340i Join Date: Nov 2022 Location: Myrtle Beach iTrader: (0)	Ordered new amp with correct index and still not working?? Do I need to reprogram? Thinking about just bringing it into service but it’s out of warranty and not trying to pay ridiculous amounts of money for something I might be able to fix. Car had HK system
	Appreciate 0 Quote

03-16-2023, 01:51 PM	#72
Steadyhand Private First Class 52 Rep 100 Posts Drives: E90, E70, F30, F97/G01 X3M Join Date: Feb 2012 Location: Virginia iTrader: (0)	In the Technic harness "add a sub" for the HK system, does anyone know what music frequencies are coming through to the two-channel Wavtech LOC? Are they low frequencies only? Huge thanks
	Appreciate 0 Quote

08-16-2023, 11:57 AM	#75
m340ixxx New Member 2 Rep 11 Posts Drives: BMW M340i Join Date: Nov 2022 Location: Myrtle Beach iTrader: (0)	Anyone fix?
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09-25-2023, 11:56 PM	#76
Liotta Soda New Member 0 Rep 10 Posts Drives: Bmw 340i Join Date: May 2023 Location: Illinois iTrader: (0)	These are on back order
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10-06-2023, 05:29 AM	#77
MHL Private 13 Rep 65 Posts Drives: '20 BMW G22 and '22 Volvo S60 Join Date: Oct 2017 Location: Europe iTrader: (0)	Just sharing my experience. I had the same issue with my '20 G22. Idrive 7 pro with HK. Went to the dealership and they performed a firmware upgrade. (which took more them two hours, but ok...) I don't drive the car on a daily basis, but the problem hasn't returned yet. Fingers crossed.
	Appreciate 0 Quote

10-07-2023, 08:29 PM	#78
Liotta Soda New Member 0 Rep 10 Posts Drives: Bmw 340i Join Date: May 2023 Location: Illinois iTrader: (0)	New booster amp installed now Sounds better But still sux
	Appreciate 0 Quote

10-09-2023, 09:33 PM	#79
m340ixxx New Member 2 Rep 11 Posts Drives: BMW M340i Join Date: Nov 2022 Location: Myrtle Beach iTrader: (0)	Can you provide picture of the new one installed? Also did they reprogram ?
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12-13-2023, 05:28 AM	#82
SoundHound75 New Member 3 Rep 15 Posts Drives: BMW 535i Join Date: Jul 2021 Location: Netherland iTrader: (0)	pinout does anyone have the pinout of this booster amp? HV5A38AB802 Thank you
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02-08-2024, 07:59 AM	#84
nil98 Second Lieutenant 125 Rep 243 Posts Drives: BMW M3 Competition G81 Touring Join Date: Jan 2021 Location: UK iTrader: (0)	Has anyone fixed this themselves? Mine is just out of warranty and displaying exactly these symptoms on the drive home last night. Grrr
	Appreciate 0 Quote

02-20-2024, 12:14 PM	#85
g20exaudinoob Enlisted Member 21 Rep 43 Posts Drives: 21' M340i sDrive Join Date: Aug 2023 Location: Upstate NY iTrader: (0)	I have had the exact issue on my 21MY M340. My car's software is also stuck on the 2021 version for some reason. My car is currently at the dealer and they verified both of my concerns citing 'faults left in the system' and are replacing the Amp and performing a software update, 0 out of pocket. Will see if my issue is truly corrected after picking the car up. Also, this might be frivolous but does anyone else notice the Harmon/Kardon label not showing up on the volume adjustment? The 2024 M340i loaner provided to me does have that label.
	Appreciate 0 Quote