S40 with HU655 tinny sound from front only

Politeknight · Mar 9th, 2015, 10:06

Hi, Ive just helped a friend replace his failing S40 with a newer one and we're having issues with the audio system.

The car has an HU655 head with the additional amp in the boot but all we can get from it is a relatively quiet tinny sound from the front speakers?

I spoke to the local volvo dealer and he suggested the head was the issue (though he admitted he didnt know there was a version with an external amp) so we purchased a replacement second hand one that was guaranteed to work but actually produces exactly the same issue.

I could buy an amp next BUT I'm wondering if theres something else we should be doing that would save us spending more money unnecessarily?

I would appreciate your help. Thanks in advance.

gatos · Mar 9th, 2015, 10:38

Check the amp fuse first. Mine blew and I only had sound from the tweeters. Also, check that the AUX cable is fitted proprly on the stereo and the amp

Failing that, it could be either the stereo or the amp are faulty. I have both as spares, so let me know if you need either

happy diver · Mar 9th, 2015, 11:09

Speakers unplugged or inoperable

Politeknight · Mar 9th, 2015, 11:18

Quote:

Originally Posted by gatos

Check the amp fuse first. Mine blew and I only had sound from the tweeters. Also, check that the AUX cable is fitted proprly on the stereo and the amp

Failing that, it could be either the stereo or the amp are faulty. I have both as spares, so let me know if you need either

Thanks very much Gatos. Intrigued by the idea of the amp fuse. Can you tell me where its located please. Am intending popping over to see him and his car with a voltmeter .. which hopefully will help me check the cables.

Politeknight · Mar 9th, 2015, 11:19

Quote:

Originally Posted by happy diver

Speakers unplugged or inoperable

Thanks happy Diver. Ill try to dig out an old speaker form one of my own projects.

baldmosher · Mar 9th, 2015, 11:36

I had those symptoms when the AUX cable was unplugged from the HU. If your sub is making noise, I am sure that is powered by the external amp, and if so, then it clearly points to the same AUX cable issue happening here?

(I take it you have plugged the small black round AUX cable into the back of the HU along with the two big ISO clunk connectors? If you have the amp there are 3 cables to plug in. 4 if you have the autochanger.)

If there's no power from the amp then yes I'd guess the amp fuse

Quote:

Originally Posted by gatos

Failing that, it could be either the stereo or the amp are faulty. I have both as spares, so let me know if you need either

I would be tempted to buy the spare amp for use in the van

although given the large metal box soundstange, I think probably easier and maybe cheaper to buy any old crap from eBay

gatos · Mar 9th, 2015, 11:46

Quote:

Originally Posted by Politeknight

Thanks very much Gatos. Intrigued by the idea of the amp fuse. Can you tell me where its located please. Am intending popping over to see him and his car with a voltmeter .. which hopefully will help me check the cables.

If I remember correctly it is in the engine bay fusebox. I blew mine when I unplugged the amp power cable with the stereo being on........

baldmosher · Mar 9th, 2015, 12:34

This is how it usually goes

1. Disconnect the battery for 2 minutes before starting this job.
2. Connect the battery again after completing this job.
3. Did you check you had the radio code before disconnecting the battery?

Politeknight · Mar 9th, 2015, 13:02

Quote:

Originally Posted by baldmosher

This is how it usually goes

1. Disconnect the battery for 2 minutes before starting this job.
2. Connect the battery again after completing this job.
3. Did you check you had the radio code before disconnecting the battery?

Cheeky! LOL. I have sourced the codes for both the HU655 head units and they both present the same issue. So suggests cable, amp or speakers (unless I've been really unlucky). I just didnt want to buy another amp in case it turned out there was something else to check first.

baldmosher · Mar 9th, 2015, 13:42

I take it both HUs have the two small round DIN sockets on the back? If there's only one, that's for the CD autochanger, and you've been diddled. However, seems unlikely that someone would install a 655 in their own car and put up with non-functioning speakers....

Double DIN socket
http://www.ft-technik.de/juni_bilder...el_N169_01.JPG

Single DIN socket
http://sg.88dbmedia1.jobsdb.com/sg_U...2917D7090D.jpg

Note the 8-pin socket for the autochanger is on both HUs and the 6-pin DIN socket is for the AUX cable.

My money would be on the fuse, if not you've got some wiring to check

My last car had a dicky o/s/f door speaker but only when using AM radio. Weird. I assumed a dodgy cable somewhere, but it had the amp, so it could literally have been anywhere in the cable routing along the car

Mar 9th, 2015, 10:06	#1
Politeknight New Member Last Online: Mar 9th, 2015 14:27 Join Date: Mar 2015 Location: Marlow	S40 with HU655 tinny sound from front only Hi, Ive just helped a friend replace his failing S40 with a newer one and we're having issues with the audio system. The car has an HU655 head with the additional amp in the boot but all we can get from it is a relatively quiet tinny sound from the front speakers? I spoke to the local volvo dealer and he suggested the head was the issue (though he admitted he didnt know there was a version with an external amp) so we purchased a replacement second hand one that was guaranteed to work but actually produces exactly the same issue. I could buy an amp next BUT I'm wondering if theres something else we should be doing that would save us spending more money unnecessarily? I would appreciate your help. Thanks in advance.

Mar 9th, 2015, 10:38	#2
gatos Premier Member Last Online: Nov 15th, 2022 21:34 Join Date: Apr 2010 Location: London / Essex	Check the amp fuse first. Mine blew and I only had sound from the tweeters. Also, check that the AUX cable is fitted proprly on the stereo and the amp Failing that, it could be either the stereo or the amp are faulty. I have both as spares, so let me know if you need either __________________ Current car: 2002 S40 1.9D, 1992 240SE Nullius in Verba

Mar 9th, 2015, 11:09	#3
happy diver Active Member Moment Last Online: Apr 29th, 2023 05:58 Join Date: Jul 2012 Location: Brisbane: perfect for one day, asleep the rest	Speakers unplugged or inoperable __________________ 20,000 leagues under the sea diving to adventure in a silent world with my ceiling the waves...Emile

Mar 9th, 2015, 12:34	#8
baldmosher moshmobile driver Last Online: Apr 22nd, 2023 16:07 Join Date: Nov 2010 Location: Warrington View Photos By: baldmosher	This is how it usually goes 1. Disconnect the battery for 2 minutes before starting this job. 2. Connect the battery again after completing this job. 3. Did you check you had the radio code before disconnecting the battery? __________________ baldmosher™ Drives: 63 V60 R-Design Lux Nav P* 106K Kill List: 07 S40 SE Sport D5 120K V40 SLux 1.9D 306K V40 S 1.9D 152K VW T4 LDV Pilot Golf GL 1.9TD Saxo 1.1i Fiesta 1.0 Pop

Mar 9th, 2015, 13:42	#10
baldmosher moshmobile driver Last Online: Apr 22nd, 2023 16:07 Join Date: Nov 2010 Location: Warrington View Photos By: baldmosher	I take it both HUs have the two small round DIN sockets on the back? If there's only one, that's for the CD autochanger, and you've been diddled. However, seems unlikely that someone would install a 655 in their own car and put up with non-functioning speakers.... Double DIN socket http://www.ft-technik.de/juni_bilder...el_N169_01.JPG Single DIN socket http://sg.88dbmedia1.jobsdb.com/sg_U...2917D7090D.jpg Note the 8-pin socket for the autochanger is on both HUs and the 6-pin DIN socket is for the AUX cable. My money would be on the fuse, if not you've got some wiring to check My last car had a dicky o/s/f door speaker but only when using AM radio. Weird. I assumed a dodgy cable somewhere, but it had the amp, so it could literally have been anywhere in the cable routing along the car __________________ baldmosher™ Drives: 63 V60 R-Design Lux Nav P* 106K Kill List: 07 S40 SE Sport D5 120K V40 SLux 1.9D 306K V40 S 1.9D 152K VW T4 LDV Pilot Golf GL 1.9TD Saxo 1.1i Fiesta 1.0 Pop Last edited by baldmosher; Mar 9th, 2015 at 13:46.

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