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Axxess AX-PO90052 Wiring Interface

Connect a new car stereo and retain the factory amp and steering wheel controls in select 2005-09 Porsche vehicles

Item # 120PO90052

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About the Axxess AX-PO90052 Wiring Interface

Axxess AX-PO90052

You want to upgrade the stereo in your 2005-09 Porsche, but you don't want to lose important factory features. Axxess' AX-PO90052 interface retains the steering wheel audio controls, along with the Porsche M.O.S.T. 25 amplifier. It also provides a 12-volt accessory output and maintains your retained accessory power (R.A.P.) feature, as well as providing the navigation connections (reverse, speed pulse, and parking brake) that you'll need to install a car stereo with GPS. 

Product highlights:

  • retains steering wheel audio controls and factory amplifier
  • maintains retained accessory power (R.A.P.) and warning chimes
  • provides 12-volt accessory output (not present in factory harness)
  • provides navigation connections (reverse, speed pulse, parking brake)
  • warranty: 1 year
  • Our 60-day money-back guarantee
  • MFR # AX-PO90052

What's in the box:

  • Radio replacement interface module
  • Amplifier interface module
  • Steering wheel control interface module (ASWC-1)
  • CTS-P005.2M wiring harness
  • Steering wheel control harness
  • LD-SWC-F3.5 harness
  • Installation Instructions

Customer reviews

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Axxess AX-PO90052 Wiring Interface Reviews

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Crutchfield response

More details on the Axxess AX-PO90052 Wiring Interface

Product Research


Vehicle Compatibility: The AX-PO90052 radio replacement interface module from Axxess Integrate allows you to replace the factory radio in select 2004-2009 Porsche vehicles featuring a stock M.O.S.T. 25 amplifier with an aftermarket head unit, while retaining important factory features.

Make Model Year
Porsche 911 (997) 2004-2009
Boxster (987) 2004-2009
Cayman (987C) 2004-2009

Retained Factory Features: The Axxess Integrate AX-PO90052 retains the following OEM features in your vehicle after you have replaced your factory radio with an aftermarket head unit.

  • Factory Amplifier: The Axxess Integrate AX-PO90052 retains the vehicle's stock M.O.S.T. 25 amplifier with balance control. Fader control is not supported.
  • R.A.P. (Retained Accessory Power): The AX-PO90052 retains the R.A.P. function in your vehicle. R.A.P. (Retained Accessory Power) supplies power to the radio after the ignition is shut off until one of the front doors are opened.
  • Warning Chimes: The AX-PO90052 will also retain factory warning chimes when present in your vehicle.
  • Steering Wheel Audio Controls: If your aftermarket head unit is steering wheel control ready, the included ASWC-1 steering wheel control interface module and harness allow you to retain your vehicle's factory steering wheel audio controls.

Outputs: The Axxess Integrate AX-PO90052 provides a 12V/10A accessory output, illumination output, and navigation outputs to make installation easier and less time consuming.

  • Accessory (12V/10A): Because there is no 12-volt accessory wire in the factory harness of your vehicle, the AX-PO90052 provides a 12-volt, 10-amp switched accessory output. This prevents you from having to run an accessory wire to the fuse box or underneath the steering column when installing your aftermarket stereo.
  • Illumination Output: The AX-PO90052 also has an illumination output if your new aftermarket head unit has an illumination wire.
  • Navigation: The AX-PO90052 provides essential wires required for aftermarket radios that have navigation. VSS (Vehicle Speed Sense), Reverse, and Parking Brake wires are provided. This helps to cut down the installation time, since the installer does not have to look for or tap into these wires in the vehicle.

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Customer Q&A

Crutchfield asked: Why did you buy this?
It was the only set of it's kind on the market. I trust Crutchfield to know their stuff. I have been missinformed by others before and it costed me a new head unit, when the where not as inexpensive. [ H  Sep 27, 2018 ]
Want to retain existing Bose amp / sub so need a MOST adapter. [ Julian  Sep 09, 2018 ]

3 questions already asked

The Bose amplifier takes a digital optical signal, correct? So it presumably has its own DAC. The converter box included in this kit must output a digital optical signal, but does it end up taking an analog input from the head unit or a digital signal? An analog signal would mean a Digital->Analog->Digital->Analog conversion before reaching the amplifier and speakers.
[ Matthias  Jan 04, 2019 ]
2 answers
Not sure what a DAC is ir the rest of yoir concerns but i installed the kit alongwith a new head unit leaving everyting else stock in my sons 05 Boxster S and it works well
[ Aaron  Jan 13, 2019 ]
I'm not sure where you're getting that first Digital, but I'm not sure it matters, I think you're right, but it works fine. I don't think the Porsche Bose system (amp & speakers) is good enough to really expose that double conversion. If you're planning to put in high end speakers with the existing Bose amp, I'd reconsider and put in your own amp to run the new speakers. In my case, perfectly satisfied with the Sony AX200 > Axxess > Bose performance, but it's admittedly not audiophile level.
[ TIMOTHY J  Jan 13, 2019 ]
It seems that the upgrade to a GPS unit does not work properly with a Bose system on a 2006 Carrera? Was this issue fixed by Crutschfield?
[ C911ERA  Dec 26, 2018 ]
1 answer
Hi Philippe, That Axxess wiring harness would support the Bose system (amp, speakers, sub) in addition to steering wheel controls in most 2006 Porsche models. It will not retain the factory GPS or backup camera. You can get both of those things through aftermarket parts through. If you have any further questions or would like one of our Product Advisors to put together a personalized cart for you call or chat with us here: --Cosmo
[ Cosmo  Jan 01, 2019 ]  Staff
My Porsche Cayman doesn't have steering wheel control. How do I buy a smaller kit?
[ nhat  Nov 28, 2018 ]
2 answers
The AX-PO90052 includes steering wheel control however the AX-PO904 does not. I simply bought the AX-PO90052 and didn't install the SWC module.
[ Gregory  Nov 29, 2018 ]
I installed this on my sons Boxster S - u just dont use a couple of connections if u dont have ateering wheel contrils - we dint have the steering controls either - the kit worked very well and even tho it was a bit expensive it was best solution (we had bad head unit but dint want to replace stock bose amp speaks sub etc)
[ Aaron  Nov 28, 2018 ]

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