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2003 S40 Radio switch from OEM to Aftermarket

Help, Advice, Owners' Discussion and DIY Tutorials on S40 and V40. In this forum you'll find S40/V40-specific owners asking and answering questions on maintenance, ownership, repairs, tutorials and almost every do-it-yourself thing you can do to save money owning these Volvos.

1996 - 2004 S40
1996 - 2004 V40

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Shane0905
Posts: 1
Joined: Fri Jul 13, 2018 4:19 pm
Year and Model: 2003 s40
Location: Seattle, wa

2003 S40 Radio switch from OEM to Aftermarket

Post by Shane0905 »

Hey everyone! So I need some help please!!! I took out the OEM radio in my 2003 s40 and am putting an aftermarket radio in but need to know the color codes. I know Black=Ground. Lol. Any help would be greatly appreciated!!! :D
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alschnertz
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Joined: Fri Apr 29, 2011 9:25 am
Year and Model: 1995 854T
Location: Connecticut
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Re: 2003 S40 Radio switch from OEM to Aftermarket

Post by alschnertz »

Check Crutchfield's site.
There is usually a lot of good information there.

They also sell adapter kits.
I used one on my 854T and it came with instructions that indicated what each color wire was.
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Boosted40
Posts: 16
Joined: Sun May 27, 2018 4:31 pm
Year and Model: 2002 S40
Location: Pennsylvania

Re: 2003 S40 Radio switch from OEM to Aftermarket

Post by Boosted40 »

Which head unit did you have? I just did my 02 S40, switched from a HU-615. Thanks.
Boosted40
Posts: 16
Joined: Sun May 27, 2018 4:31 pm
Year and Model: 2002 S40
Location: Pennsylvania

Re: 2003 S40 Radio switch from OEM to Aftermarket

Post by Boosted40 »

Okay, I know this is a little late, but I figured I'd post here to have the information handy on MVS, and considered Crutchfield seems to be charging for diagrams, here you go. I had to do a bit of searching, and never did find the actual correct diagram for my head unit. I'm pretty sure I referenced multiple unit configurations and came up with this. Please note, this is from a 2002 Volvo S40 1.9T American version with an HU-615 head unit. Others head units could be different.

Order will be: Color:Function
The colors and functions should be right for A, but I think B might be a little different on one of the speaker + and - colors. Just use the process of elimination.
A-Green Connector
Orange:Constant 12V
Brown/White:Accessory 12V
Yellow:Rheostat Illumination (Dimmer)
Big Black:Ground
Small Black:Supposed ground, I hooked it up as a ground but some sources say CAN. I haven't had any issues after using it as a ground.
Small Red:Antenna Remote +
Green:Speed
Red/Black:Possible CEM control module. Tested it and no 12V power came from the car harness when disconnected from radio. I taped this one off

B
Brown:Front Left+
White:Front Left-
Green Yellow:Front Right+
Green:Front Right-
Yellow/Black:Rear Left+
White:Rear Left-
Yellow:Rear Right+
Green/White:Rear Right-

There are 2 whites listed on this connector, though it may be different. From what I recollect, the wires for each corner speaker(s) were paired together on the connector, so you should be able to figure out which white goes to which speaker with that information. Good luck buddy, and I hope you enjoy your new stereo!
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