whitex

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I am posting this description on how to use the Taycan dashcam prewire option to install a Blackvue, 2-channel dashcam and a Valentine one radar detector. This allows you to wire in a dashcam front and back, plus a radar detector, using existing Porsche wiring (no need to run cables to the fuse panel or front-to-back, through to the hatch on CT/ST).

Note: Thanks to @fastlorenzo for posting results of his pre-wire investigation in another thread. His information saved me a bunch of time. This post is intended to save even more time to the next person attempting to use Taycan dashcam pre-wire to install a dashcam, radar detector, or other accessories.

Some information on the dashcam pre-wire:

To access the pre-wire in the front you will need to remove the overhead console (2 screws under the 2 grills on each side of it which just pop out). I also recommend taking out both sun-visor clips (not the actual sun-visor hinge mounts), their top cover just pops off and they come out with a gentle pry. Lastly, you will need to unscrew the 2 screws holding the headliner. Here is what it looks like in the car.
Porsche Taycan Illustrated guide to using Dashcam Prewire for 3rd party dashcam and other accessories 1714979480412-0l


There are 2 connectors pre-wired under the front headliner, 1 Fakra coax male and one six pin male connector for power. Here is where the connectors are in the front (#2 in picture below, from Porsche dashcam installation document)
Porsche Taycan Illustrated guide to using Dashcam Prewire for 3rd party dashcam and other accessories 1714954484488-l0



The connectors are in a plastic holder which is attached to the roof metal via a plastic clip which looks like this:
Porsche Taycan Illustrated guide to using Dashcam Prewire for 3rd party dashcam and other accessories 1714954493136-0j



It’s easily detached from the roof using a pry tool like this:
Porsche Taycan Illustrated guide to using Dashcam Prewire for 3rd party dashcam and other accessories 1714954517961-ic



The coax connector is a 50 Ohm impedance straight shot to the rear of the car. I measured the impedance and it came out at 59.94Ohms, but I think the additional characteristic impedance might have come from the fact that I was using a number of connector converters (see picture below).
Porsche Taycan Illustrated guide to using Dashcam Prewire for 3rd party dashcam and other accessories 1714954602578-4r



When I measured the characteristic impedance of the Blackvue coax wire using the same setup, it came out to 59.94Ohm exactly as well, so I’m pretty confident the Porsche pre-wire matches the Blackvue impedance very well (it’s also been working on my car just fine since the install).

The 6 pin power connector is wired as follows (this is a picture of the female end that plugs into the prewire):
Porsche Taycan Illustrated guide to using Dashcam Prewire for 3rd party dashcam and other accessories 1714954730386-19



  • Pin 1 - BATT is a permanent 12V positive (actually typically 13.8-14.4V)
  • Pin 2 - GND is ground or negative terminal for 12V
  • Pin 3 - ACC is switched 12V positive which for some reason measure ALWAYS 340mV lower than BATT. Not sure why that is but it could be voltage drop due to existing load on that power rail – for that reason I chose to add a relay to my setup to power the radar detector, rather that running is straight from ACC. Blackvue dashcam already does this natively, hence it has separate BATT and ACC connections, and it draws almost all of its power from BATT, using ACC to know when to drop to low power parking mode.
  • Pins 4,5,6 - go to the back 6 pin connector (which only has 3 pins wired).
Worth noting that my Taycan did not come populated with the fuse for BATT, which is fuse A2 in the passenger footwell – I added 5A fuse there.
Porsche Taycan Illustrated guide to using Dashcam Prewire for 3rd party dashcam and other accessories 1714954753391-w2


To access the rear you will need to remove at least the bottom panel on a CT hatch, but to run the wire to the top of the window where I chose install my dashcam, you will need to remove the other 2 panels too. The bottom panel is just clipped on, the top one are also attached by clips but each has a single screw you need to undo before unclipping them. Here is what the rear hatch looks like after removing the bottom panel (in this picture I was testing the rear dashcam using a test cable).
Porsche Taycan Illustrated guide to using Dashcam Prewire for 3rd party dashcam and other accessories 1714954785442-4e



Here is what it looks like with all 3 panels removed:
Porsche Taycan Illustrated guide to using Dashcam Prewire for 3rd party dashcam and other accessories 1714954802537-g8


For sedan rear instructions, please see attached bulletin PDF

Parts that you will need:
Porsche Taycan Illustrated guide to using Dashcam Prewire for 3rd party dashcam and other accessories 1714954851064-wb



  1. Fakra K Female connector (e.g. Amazon link here)
  2. VW/AUDI/SKODA/PORSHE 6-pin seat connector (I found some on ebay, picture shows one pre-wired already and a couple ready to wire ones)
  3. Blackvue dashcam coax wire
  4. Automotive wire harness tape
  5. Blackvue dachcam power wire
  6. (OPTIONAL) radar detector hardwire connector
Also optional, I used an automotive 12V relay like this (Amazon link) to provide my own switched power from BATT for the radar detector and other future accessories. I didn’t want to overload the ACC line as it was obviously in use for other things – fuse is labeled “Interior Mirror”, C8 in driver’s side panel came already installed, so something is using it. The relay loads it with a steady load (of 130mA-170mA depending on relay temperature), so less likely to cause issues.
Porsche Taycan Illustrated guide to using Dashcam Prewire for 3rd party dashcam and other accessories 1714954897808-0


For power delivery I built myself a power harness. I added an accessory connector with GND, BATT, ACC, and RELAY-BATT from the relay to use for radar detector or future accessories).
Porsche Taycan Illustrated guide to using Dashcam Prewire for 3rd party dashcam and other accessories 1714954976808-1t


I wrapped the relay in some foam before installing in the car to ensure it doesn’t rattle while driving.
Porsche Taycan Illustrated guide to using Dashcam Prewire for 3rd party dashcam and other accessories 1714954995537-d


If you’re wiring only the dashcam which supports both BATT and ACC connections, you don’t need the relay or the accessory connector on the bottom of this picture, so it would look like this – much simpler to make too.
Porsche Taycan Illustrated guide to using Dashcam Prewire for 3rd party dashcam and other accessories 1714955010947-am





Then for the radar detector a simple harness that will plug into the above accessory connector:
Porsche Taycan Illustrated guide to using Dashcam Prewire for 3rd party dashcam and other accessories 1714955029056-yf


For coax/video cable, you will need to make a couple of Fakra to Blackvue cables. Mine ended up being 17 inches for the front, and 49 inches for the back. NOTE, crimpers for the center pin are expensive for the Fakra connectors (as they are very small gauge) but only needing 2, you should be able to solder them (I did). The outside crimp can be done with many other crimpers. Here are the 2 finished cables.


Porsche Taycan Illustrated guide to using Dashcam Prewire for 3rd party dashcam and other accessories 1714955062946-zb


And here is the rear hatch wired up with the longer one (I ran the wire along other Porsche harness). I never used the rear power connector since Blackvue sends power to the rear camera via the video coax cable. For the front connection, I also wrapped it in some foam before installing to prevent it from rattling under the headliner.
Porsche Taycan Illustrated guide to using Dashcam Prewire for 3rd party dashcam and other accessories 1714955089335-y


On the front, the relay will need to be pushed a little back to have enough room. I made sure I kept the 6 pin power connector easily accessible by just removing the mirror base cover. This way if there is every any question whether or not my installation is interfering with any Porsche electronics, I can disconnect it all with just a pry tool (or a credit card).




Porsche Taycan Illustrated guide to using Dashcam Prewire for 3rd party dashcam and other accessories 1714955163129-hj

After all said and done, it looked something like this:
Porsche Taycan Illustrated guide to using Dashcam Prewire for 3rd party dashcam and other accessories 1714955185190-a8



Porsche Taycan Illustrated guide to using Dashcam Prewire for 3rd party dashcam and other accessories 1714955195125-4y


I hope this helps someone save some time. It also makes the dashcam + radar detector install 100% removable, should you want to, as well as easily disconnected in case you ever run into any issues with the shop diagnosing things and thinking your install may be interfering.
 

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Electron

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Great write-up - thanks for posting!
 

blown383

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Amazing write up! Thank you for taking the time to do this post.
 


blame.latitude

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You see, this is the content I subscribe here for. Bravo!

Question: how do you get the nice Porsche procedure pdf? I'd love to have more references to nerd over.
 
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whitex

whitex

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Question: how do you get the nice Porsche procedure pdf? I'd love to have more references to nerd over.
A lot of them come from NHTSA public disclosure documents. Someone (sorry, I don't remember who) put together an index of Taycan related ones here:
https://ti-list.azurewebsites.net/

Nerd away! Share anything interesting you dig up (there is a lot of them).
 
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rs38

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Someone would love to see a such a nice installation guide on how to retrofit the homelink opener. Probably nothing you need in NA as it's default?
 
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whitex

whitex

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Someone would love to see a such a nice installation guide on how to retrofit the homelink opener. Probably nothing you need in NA as it's default?
I am not 100% about Homelink being default in the US, but yes, my car came with it. I suspect it is the same physical unit as in Germany, since I once accidentally switched mine to Germany country code, resulting with me not being able to use it until I figured out what I did and fix it (actually, I was messing with the PCM, but as far as I can tell it programs Homelink on key-on, which sets the available frequencies in the set country, so in my case it wouldn't emulate any US garage door openers CORRECTION, checked my notes, it is BCU1 ECU that controls UGDO Sender configuration, most likely via the LIN bus that is interconnecting them).
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