1998 BMW 740iL Car Audio Wiring Diagram

Whether your an expert BMW 740iL mobile electronics installer, BMW 740iL fanatic, or a novice BMW 740iL enthusiast with a 1998 BMW 740iL, a car stereo wiring diagram can save yourself a lot of time. Automotive wiring in a 1998 BMW 740iL vehicles are becoming increasing more difficult to identify due to the installation of more advanced factory oem electronics.

One of the most time consuming tasks with installing an after market car stereo, car radio, satellite radio, xm radio, car speakers, tweeters, car subwoofer, crossovers, audio equalizer, car amplifier, mobile amp, car amplifier, mp3 player, ipod or any car audio electronics is identifying the correct color car audio wires for your 1998 BMW 740iL.

The Modified Life staff has taken all its BMW 740iL car radio wiring diagrams, BMW 740iL car audio wiring diagrams, BMW 740iL car stereo wiring diagrams, BMW 740iL car radio wiring schematics, BMW 740iL car wiring diagrams and cataloged them online for use by our visitors for free. Our automotive wiring diagrams allow you to enjoy your new mobile electronics rather than spend countless hours trying to figure out which wires goes to which 1998 BMW 740iL part or component.

Feel free to use any BMW 740iL 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 and most of the car audio wiring diagrams listed on our enthusiast website are submitted by the Modified Life community. Use of the BMW 740iL 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 740iL.


If you have any questions pertaining to the audio system in the 1998 BMW 740iL, please feel free to post it at the bottom of this page and either we’ll do our best to find you the information you need or hopefully someone in the Modified Life community will have the information you’re looking for.

Request a Car Stereo Wiring Diagram

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

Adding More Information

If you would like to help the Modified Life community by adding any missing information or adding a new car audio wire diagram to our resource, please feel free to post it at the bottom of this page.

1998 BMW 740iL Car Audio Wiring Diagram

Car Radio Battery Constant 12v+ Wire: Run a wire to the fusebox or ignition switch harness for constant power.
Car Radio Accessory Switched 12v+ Wire: Purple
Car Radio Ground Wire: Brown
Car Radio Illumination Wire: N/A
Car Stereo Dimmer Wire: N/A
Car Stereo Antenna Trigger Wire: N/A
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: 5 1/4″ Speakers
Car Audio Front Speakers Location: Kick Panels
Left Front Speaker Positive Wire (+): Yellow/Red
Left Front Speaker Negative Wire (-): Yellow/Brown
Right Front Speaker Positive Wire (+): Blue/Red
Right Front Speaker Negative Wire (-): Blue/Brown
Car Audio Rear Speakers Size: 5 1/4″ Speakers
Car Audio Rear Speakers Location: Rear Doors
Left Rear Speaker Positive Wire (+): Yellow/Blue
Left Rear Speaker Negative Wire (-): Yellow/Gray
Right Rear Speaker Positive Wire (+): Blue/Purple
Right Rear Speaker Negative Wire (-): Blue/Gray


  • Reply Valease Nicholson July 23, 2010 at 10:57 am

    Hi. I am trying to install a dvd /gps system into my car. I have all the wires hooked up correctly but i am still getting no sound .My car have the built in amp system in to the speakers and i do not want to by pass . It has a DPS system on it .where the phone and all hook into to harness but on the new harness there is no place for the other piece of the harness hook into for the DSP system to work and the phone. I am aware that i am going to loose the ability to use the phone and the DSP system but i need the amp to come on for my speakers to work and i believe the wire is hook into to other hookup for ha the DPS wire and phone wire are all connected in one big wire hook up for the original harness. What do i do ?? What wire needs to be hooked up for the speaker amps to come on? I need help..

  • Reply Karl Freund August 6, 2010 at 7:47 pm

    Because your car has the DSP, you’ll need to bypass the factory amp and use the headunit’s internal amplifier to power your speakers.

  • Reply ModifiedLife August 10, 2010 at 11:44 pm

    Karl, thanks for the 1998 BMW 740il stereo wiring information contribution!

  • Reply Jose Neira April 27, 2011 at 10:43 pm

    I would like to have wiring diagram for 1998 bmw 740il for the alarm system. thanks

  • Reply ModifiedLife May 2, 2011 at 11:33 pm

    Jose, ask and you shall receive: 1998 BMW 740il Car Alarm Wiring Diagram

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