Electrics: - Any specialists who deal with Volvo stereos these days?

boombox · Feb 24th, 2021, 20:25

Are there any specialist firms who repair head units etc around at the mo? I'm determined to get to the bottom of my problem. Apparently the maker of the 'Legend' replacement HU has come across this issue when the built in original HU was replaced with the 'Legend' HU it went away. Another guy (in Sweden I think) said he had the issue but it went away when he installed a Grom unit alongside his original HU. I'm thinking it MUST be possible to solve it, especially if it's not some freak issue specific to my Volvo.

Thanks

SwissXC90 · Feb 26th, 2021, 06:48

Try the following:

Check your grounds and shielding on the aux cabling all the way to the back of the head unit

Disconnect from head unit (remove pins) and test for any ground loops or poor connectivity

Reconnect, try terminating the aux input with a low resistance like 100 ohms, how does that compare

Tracing of audio input noise requires a lot of trial and error, as well as understanding of noise sources, to determine where it comes from.
It often helps to have a known good unit to compare with.

i did a lot of this when I was younger. Nothing beats spending hours in the vehicle with all the panels off trying different things.

Feb 24th, 2021, 20:25	#1
boombox Member Last Online: May 19th, 2023 09:51 Join Date: Dec 2016 Location: Leeds	Any specialists who deal with Volvo stereos these days? Are there any specialist firms who repair head units etc around at the mo? I'm determined to get to the bottom of my problem. Apparently the maker of the 'Legend' replacement HU has come across this issue when the built in original HU was replaced with the 'Legend' HU it went away. Another guy (in Sweden I think) said he had the issue but it went away when he installed a Grom unit alongside his original HU. I'm thinking it MUST be possible to solve it, especially if it's not some freak issue specific to my Volvo. Thanks

Feb 26th, 2021, 06:48	#2
SwissXC90 Premier Member Last Online: Mar 20th, 2024 18:26 Join Date: Jan 2016 Location: Cross Country	Try the following: Check your grounds and shielding on the aux cabling all the way to the back of the head unit Disconnect from head unit (remove pins) and test for any ground loops or poor connectivity Reconnect, try terminating the aux input with a low resistance like 100 ohms, how does that compare Tracing of audio input noise requires a lot of trial and error, as well as understanding of noise sources, to determine where it comes from. It often helps to have a known good unit to compare with. i did a lot of this when I was younger. Nothing beats spending hours in the vehicle with all the panels off trying different things. __________________ XC90 R-Design MY2009, Black Sapphire Metallic. HP-Sound, RSE, Nav, Tel, ParkingCam, BLIS, ParkingHeater, RestHeat, Removable Towbar, Summer: CRATUS 20x8 on Pirelli Scorpion Zeros 255/45, Winter: NEPTUNE 17x7 on Continental WinterContact 4x4 235/65.

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