OBDII Port Digital Speedometer Fix

Hi all, first time posting on here but I thought this would be worth sharing.

I am a huge fan of those reflective "HUD" speedometers that use the OBDII port to display your speed on the windshield. Having just got a "new" 2001 Tundra I decided to throw one in.

(link to mine on Amazon:

$28 iKiKin M7 Dual Mode Windshield Projector Car HUD Display for Trucks and All Cars

https://www.amazon.com/gp/product/B07MCWG3JT?ie=UTF8)

Much to my dismay, once plugged in and the vehicle was started, the ABS light started flashing. Figuring something was off I unplugged the device and looked for a solution.

Here is the solution: on the OBDII connecter that the SPEEDOMETER uses, one of the pins is causing the issue. For me, it was pin 11 (as shown in the diagram attached). I used needle-nose pliers to remove the pin (from the speedometer connector, not the port on the vehicle), and the ABS problem was fixed.

Before all five of you interested go tearing out pin 11 on your SPEEDOMETER'S connector, here are the steps that I took to determine the trouble pin. Using the aforementioned pliers, I bent pin 9, 10, and 11 to the bottom of the connector housing. Plugging it in after each attempt to see what the trouble pin was. DO NOT just take out the pin from your connector, as you cannot undo it. Test which pin it is first before removal.

The problem I think is caused by a short in one of the connector pins, which is what I read on some related posts. Removing this pin from the equation allows your speedometer to function perfectly, letting you go back to ignoring your dial while driving.

 

I'm not sure what the purpose of this is. Did your stock speedometer quit working?

 

No, I just prefer to have it display on my windshield. I find it keeps my focus more on the road while driving. I made this post because I couldn't find any solutions existing already, and it seems to be a common issue with "older" toyota vehicles.

 

I appreciate the info, but a quick PSA here…

Be careful leaving anything plugged into the OBD port on these trucks constantly. We have seen a flurry of cases where the trucks freaked out, refused to start, excess battery drain, phantom trouble indication lights in gauge cluster, etc. from leaving things plugged into it. Dunno why but removing said OBDII device, even just the occasional unplug solves the issue.

But more than that, l’d be wary of plugging any generic, no-name brand Chinese crap into any port on my car that has direct access to fry the heart/brains of my vehicle. Think about that for a sec. At $30, who is gonna pay for it if that thing does fry your truck!? How are you gonna prove it? Is some cute* reflective numbers on your windshield worth it? Do you really think “iKiKen” is a real company that will support repairing your vehicle, or will exist after 2-3 years? It’s likely a scAmazon one-hit wonder, fly by night grift company. (The norm on there)

 

Absolutely worth being said, take great care with what you plug into your vehicle. I tested this specific model for around a year in my old daily, and had no issue. Which is why I feel comfortable driving with it. Not to say that all models will work, or even all of this specific model will. Being concerned with the battery is huge, so at the moment I simply unplug when done driving. This fix was to alleviate my concern with the ABS light.

While I forgot to mention this originally, this might also apply to the myriad of OBDII bluetooth sensors on the market. I however do not have one so I don't know if it would.