I had a dashcam to install on a 2019 Cayenne Turbo. I needed a switched power source (ACC) and I thought I could pigtail off of something in the fuse box. I looked in the owner’s manual and found out that there was no fusebox on the passenger side which would have been closer to the desired dashcam position. So I went to the driver’s side and found that…

1. There is no legend or markings telling me the socket numbers
2. The fuses in the sockets don’t correspond to those in the manual

This happened on the 2008 Cayenne Turbo too. The “first year of production” models and their manuals don’t match up.

I couldn’t find a suitable switched power source anyways so I went to the fuse box under the dead-pedal. Same problem here; no markings and fuses are either missing where the manual say they should be or a fuse is in a position the manual doesn’t say there should be one.

Anyways, I made an educated guess and figured out that the middle column in the bottom row had to be “Row D” in the manual. I confirmed this by pulling the fuse from position #16 – Left headlight electronics. When I turned the ignition, a warning for “Left lo-beam…” showed up on the dash. The funny thing is the left headlight still worked without the fuse. It must be the automatic hi/lo beam sensor or some other PDLS feature unrelated to the regular lights.

So for those seeking a switched power source, you can use socket #15 and #16 (Right and Left headlight electronics). There IS enough height for piggy back adapters under the dead-pedal. If you’re using TWO piggy-back/add-a-circuit, BEWARE – the pigtail from #15 will interfere with #16. A little bit of plastic shaving/forming will be necessary. And no, you can’t flip one left-side-right either because the divider in the fusebox interferes with the piggy-back.

Good Luck!

So, for a while, I’ve been testing out some Dashboard Cameras and iPhone chargers that utilize the Cigarette Lighter Socket in the car. When I decided to mount the equipment to the car permanently, I wanted to draw power from the car from somewhere other than the Cigarette Lighter Socket where I had to keep the ash tray open. I also wanted the power to turn on and shut off with the ignition of the vehicle.

On the Cayenne’s two fuse box by the driver’s side and passenger side doors, there are some open sockets for factory installed options. In the vehicle manual, it should be marked “auxiliary” or “un-used”. But if you peek into the sockets, you’ll see that one side of the fuse socket will have a metal conductor. Using a voltmeter, check that you get 12V when you turn on the ignition and goes to zero when you shut off the car. If you still have something like 0.3V when you shut off the ignition, that fuse is on a timed relay from the CAN-BUS system and not a TRUE switched 12V socket. Don’t trust my photos. Each vehicle is wired differently due to the factory options available on the Cayenne. Always check and re-check with a voltmeter.

There are two of these switched 12V fuse sockets in both fuse boxes for a total of four (4). You may use a fuse tap, a blade socket, or add-a-fuse type piggy-back to get the 12V+ from these socket. On the driver’s side fuse box, there is a hex head screw on the metal frame of the dash to supply the Ground (GND) but this is absent on the passenger side… unless you’re vehicle has been pre-configured with a grounding post for optional equipment. For those who are not so lucky, you can easily tap a hole into the metal frame to screw in a grounding post.