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Good day all,

I have a 2003 Z4 2.5i with a HiFi Business CD stock stereo system. Unfortunately, I had an aftermarket subwoofer, amp, and crossover installed that made my stock system sound bad. So I removed all the aftermarket audio and I am trying to put everything back to stock. The only trouble I am having is identifying where some of the cables go.

I have attached two pictures to help show what I am referring to. All of the cables to the right are all of my speaker cables and antenna. The cables to the left I am unsure what they are or where they go. If you have any idea where these go, I would greatly appreciate the guidance. The cables I need help identifying are:

- blue/blue w/white stripe
- red/yellow w/red stripe
- brown
- red w/yellow stripe

Also, I am not sure if this car came with a stock amplifier. Do all Z4's come with stock amps?

Let me know if you have any ideas.

Thank you!

Car Radio Battery Constant 12v+ Wire: Red/Yellow
Car Radio Accessory Switched 12v+ Wire: Violet/White
Car Radio Ground Wire: Brown
Car Radio Illumination Wire: Gray/Red
Car Stereo Dimmer Wire: N/A
Car Stereo Antenna Trigger Wire: White
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: N/A
Car Audio Front Speakers Location: N/A
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: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Yellow/Violet
Left Rear Speaker Negative Wire (-): Yellow/Gray
Right Rear Speaker Positive Wire (+): Blue/Violet
Right Rear Speaker Negative Wire (-): Blue/Gray
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