Car Stereo Radio Wiring Diagram- 1998 BMW 3 Series


Whether your an expert installer or a novice enthusiast with a 1998 BMW 3 Series (318ti 318i 323i 328i 328is 323is), an automotive wiring diagram can save yourself time and headaches. One of the most time consuming tasks with installing a car stereo, car radio, car speakers, car amplifier, car navigation or any mobile electronics is identifying the correct wires for a 1998 BMW 3 Series (318ti 318i 323i 328i 328is 323is).

The Modified Life staff has put their heads together to create an invaluable resource containing car stereo wiring diagram, car wiring diagram and radio wiring diagram. Feel free to use any car stereo wiring diagram that is listed on Modified Life but keep in mind that all information here is provided “as is” without any warranty of any kind. Use of the wiring information is at your own risk. Always verify all wires, wire colors and diagrams before applying any information found here to your 1998 BMW 3 Series (318ti 318i 323i 328i 328is 323is).

If you can’t find your car radio or stereo wire diagram on Modified Life, please feel free to post a car wiring diagram request at the bottom of this page and we’ll do our best to find you the information you need for your mobile installation.

1998 BMW 3 Series Car Stereo Radio Wiring Diagram

Wire diagram applies can be used for 1999 BMW 318ti 318i 323i 328i 328is 323is models.

Radio Constant 12V+ Wire: Red/White
Radio Switched 12V+ Wire: Purple/White
Radio Ground Wire: Brown
Radio Illumination Wire: None
Radio Dimmer Wire: None
Radio Antenna Trigger Wire: White
Radio Amp Trigger Wire: None
Front Speakers Size: 5 1/4″ Speakers
Front Speakers Location: Kick Panels
Left Front Speaker Wire (+): Yellow/Red
Left Front Speaker Wire (-): Brown/Orange
Right Front Speaker Wire (+): Black/Red
Right Front Speaker Wire (-): Brown/Orange
Rear Speakers Size: 4″ Speakers
Rear Speakers Location: Rear Deck
Left Rear Speaker Wire (+): Yellow/Black
Left Rear Speaker Wire (-): Black/Orange
Right Rear Speaker Wire (+): Blue/Black
Right Rear Speaker Wire (-): Brown/Orange

2 thoughts on “Car Stereo Radio Wiring Diagram- 1998 BMW 3 Series”

  1. Scott, your vehicle may have a factory amplifier that needs to be turned on by your after market radio. Unfortunately, we don’t have this information but maybe someone from the Modified Life community can post that information here. Hope this helps. Good luck.

  2. It seems like it’s a bonehead request, but after switching from an Alpine to Blaupunkt cd /receiver in my 1998 bmw 323, there was no signal reaching any of the speakers. I was careful to repeat the same hookups, and have since run new wires directly to the front speakers just to give me temporary tunes.
    From the player, the speaker wires all run into the center console tunnel where they head under the rug toward the driver’s seat. Before I remove the seat to further trace the wires to an assumed equalizer or switcher, I thought I’d run this by anyone who might just know where to look for the mystery junction where the wires change from one set of color codes to completely different colored wires that run to the actual speakers? My manual makes no mention of an equalizer, and doesn’t show a change in wire colors. THANKS!

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