Car maintenance, cleaning, vehicular law, etc.

  • Automotive

    2019 Cayenne Turbo fuse box confusion

    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!

  • Automotive

    Adding an ACC Powered Equipment to a 2008 Porsche Cayenne Turbo

    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.


  • Automotive

    DTC B2aaa

    B2aaa is not a real DTC error code. It is a placeholder value for DTC reader manufacturers. It should be labeled as “N/A” or “Unknown”, but programmers in China don’t really care.

  • Automotive

    Note: 2008 Porsche Cayenne Turbo (9PA) Brake Pad & Rotor Replacement

    Some notes for the brake pad and rotor replacement on the 2008 CTT.

    • Time – 90 min/wheel
    • Technical -★★☆☆☆
    • Strength – ★★★★★
    • Dexterity -★★★☆☆

    On the 2008 Turbo (and possibly the Transsiberia) ONLY, the “big-red” calipers are the closed-top type. Therefore the brake pads cannot be removed without taking the calipers off the mounting brackets. That’s okay, because with how the car eats through the OEM rotors, you’ll want to change the rotors too. The bolt sizes are different from all other model years, so BEWARE.

    The process for replacing the pads and rotors are not complicated, but is dirty and probably the heaviest parts one would encounter on a DIY repair. Clean the wheel and tires before starting and prep your garage for a mess. Wear cloths you don’t mind getting dirty and have some disposable gloves ready. You will be working in the shadows of the wheel well – get good lighting.

    You will have NO LUCK trying to remove the brake pad wear sensors from the old pads unless the car just rolled off the ship from Germany. Buy new ones.

    You really don’t need replacement screws, bolts, or springs if your car has miles but not track/dirt time. Centric Posi Quiet pads come with the retaining clips if you’d like the visible parts to look shiny new.

    There are NO RETAINING PINS because the pads are mounted from below.

    There is a thin stainless steel backing plate on the OEM pads. You will need to clean and re-use them. Put new brake grease between the new pads and backing plate. NO GREASE between the backing plates and the caliper.

    Otherwise, the pad and rotor replacement process is the same as all other 9PA vehicles. The article at is very helpful.


    • Front rotor 368mm (I/C 09.9870.11)
    • Rear rotor 358mm (I/C 09.98710.11)

    Brake pads

    • Front brake pads (955.351.939.63 or I/C 104.13490)
    • Rear brake pads (955.352.939.64 or I/C 104.13500)

    Brake wear sensors

    • Front
    • Rear


    • Wheel bolts: 19mm
    • Front caliper bolts: 21 mm
    • Rear caliper bolts:
    • Front rotor screw: T47
    • Rear rotor screw:


    • Fron rotor to hub: 10.5 ftlb
    • Front caliper to bracket: 200 ftlb
    • Rear rotor to hub: 10.5 ftlb
    • Rear caliper to bracket: 133 ftlb
    • Wheels to hub: 118 ftlb


    • Jack & Stands
    • Breaker bar (>200 ft/lb)
    • Torque wrench – small (for 10.5 ft/lb)
    • Torque wrench – large (for 200 ft/lb)
    • Socket wrench
    • 19mm deep socket
    • 21mm shallow socket
    • T47 bit socket
    • Socket adapters (as needed)
    • Brake pad spreader or Channel lock-type pliers
    • Short sledge hammer
    • Flat head screw driver or pry-tool
    • Wheel bolt guide
    • Zip ties or a tall bucket
    • Anti-seize (aluminum)
    • Brake pad grease
    • Break cleaner
    • WD-40
  • Automotive,  Tech

    A Little Hint When Updating AVIC Firmware

    To update the firmware on the Pioneer AVIC series GPS navigation systems, you need to utilize an SD card formatted in MS-DOS FAT16. If you’re using a Mac, this might be difficult for you to come by because Disk Utility only formats MS-DOS discs in FAT32.

    Of course, the solution is to use the Terminal. BUT FIRST YOU MUST USE Disk Utility TO PARTITION THE SD CARD. The whole reason behind FAT32 was that the FAT16 file system for MS-DOS/Windows had this memory issue where it couldn’t handle any primary or secondary memory (HDD or RAM) larger than 2 Gigabytes. So if you look at machines from the mid to late 90s, you’ll see that they were maxed out at 2GB of RAM and 2GB partitions even if the hard disk had a larger capacity. Well, for whatever reason, the same goes for the firmware upgrade program that is riding on Pioneer’s AVIC series GPS systems.

    If you’re using an SD card larger than 2GB (who isn’t), you’ll first need to make 2GB partitions using Disk Utility. Then use the Terminal to format ONLY THE FIRST PARTITION on the SD card – Essentially making the SD card into a 2GB card.

    The Terminal command you’ll be using is newfs_msdos. You may look at the man pages if you want to learn more, but for now, the command you want is:

    sudo newfs_msdos -F 16 /dev/partition_location

    *partition_location probably being disk1s1 if the SD card is the only storage device other than your main HDD.

    Go ahead and mount this partition using Disk Utility again. Drop the un-zipped AVIC110 folder onto the SD card, and use CleanEject* to eject the SD card without the Mac writing un-necessary invisible files to the volume. Pull the SD card out of the reader, lock it, and you’re ready to put it in your car nav.

    *CleanEject is donation-ware made by JaVaWa. Check them out!