Wednesday, June 5, 2013

Porsche Carrera 4S Aftermarket Stereo Install Factory Amp Bypass


I recently installed an aftermarket stereo and amplifier into a 2003 Porsche Carrera 4S, it was a pretty easy install. If you are going to be working on one of these vehicles, this may help you out.

Porsche Carrera 4S Aftermarket Stereo Install Factory Amp Bypass

Porsche Carrera 4S Aftermarket Stereo Install Factory Amp Bypass
The factory amp should be located on the driver side of the storage compartment under the hood, right next to the spare tire.

Porsche Carrera 4S Factory Amplifier location Wiring Bypass
Once the spare tire is removed you should have easy access to the two 10m bolts that secure the metal braket holding the factory amp in place. I fully bypassed the factory amp and installed an aftermarket in its place.

Porsche Carrera 4S Factory Amplifier location Wiring Bypass
At the factory amp there should be 6 pairs of speaker wires, 2 pairs going to the front dash speakers, 2 pairs going to the front door speakers, and 2 pairs going to the rear speakers. There should also be a heavier gauge pair going to the factory subs if equipped. The front dash speakers, and the front door speakers should meter 2ohms each when testing the speaker wires at the factory amp. The rear speakers should meter 4ohms each. The factory subwoofers if equipped, behind the seats will typically meter 1ohm each (single voice coil). They are normally wired in parallel, so at the factory amp the pair of wires for the subs will meter 1/2 ohm. Depending on the aftermarket amp you are installing, you may need to rewire the subs in series to bring the load up to 2ohm.

This should be the wire colors-

Front Left Dash Positive - Yellow
Front Left Dash Negative - Yellow/Brown
Front Right Dash Positive - Red
Front Dash Right Negative - Red/Brown
Front Left Door Positive - Green
Front Left Door Negative - Brown/Green
Front Right Door Positive - Purple
Front Right Door Negative - Brown/Purple
Rear Left Positive - Blue
Rear Left Negative - Brown/Blue
Rear Right Positive - Blue (Pin 13-14)
Rear Right Negative - Brown/Blue

Once I had my speakers and subs all wired I ran power from the battery, which is only about 5 feet away. I Then grounded the amp, and ran my RCA's and amp turn on/stereo ground wires to the new stereo. 

Porsche Carrera 4S Factory Amplifier location Wiring Bypass
There should be a rubber grommet on the driver side firewall, where you can run your wires through.

Porsche Carrera 4S Aftermarket Stereo Install Factory Amp Bypass
Behind the factory stereo you should have a 12V constant wire on the factory stereo harness. I used that and the ground I ran from the same grounding point as the new aftermarket amp, to try and eliminate the possibility of engine noise. You will however need to run switched power from the fuse panel (driver side kick), or tap into switched power directly off the vehicles ignition switch. DO NOT MISTAKE THE VSS WIRE FOR SWITCHED POWER ON THE FACTORY STEREO HARNESS.
Hope This Helps!
Jeremy's Car Audio Tips  



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