No power on DLC pin 16?

2005 HYUNDAI ELANTRA
125,000 MILES • 2.0L • 4 CYL • 2WD • AUTOMATIC
Avatar
DAN.M
  • MEMBER
  • 2 POSTS
Hi, curious thing here. Recently the DLC on this car will not power up scan tools or a VLC adapter. Some of these have worked on this car in the past. No fuses blown. I found power on pin 9, GND's on pins 4 and 5 but no power on pin 16 which I thought was standard for OBDII. Can you explain this? I'm pretty sure this is why scan tools are not happy. If I power the VLC externally it connects to the ECM and all other modules. What's going on? Thanks
Jul 6, 2021 at 8:51 AM
Advertisement
Avatar
STEVE W.
  • ✓Experienced Mechanic
  • 15,327 POSTS
Not uncommon for the power to that pin to fail in other vehicles, however in that car it won't fail because for some reason they decided not to send power to that pin, instead you need a power cord to power the tool. Attached you can see that there is no connection listed for pin 16. Some scan tools pull power from pin 9 as well as 16 so it's possible those worked while others didn't.
Image (Click to enlarge)
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Jul 6, 2021 at 12:07 PM
Avatar
DAN.M
  • MEMBER
  • 2 POSTS
Hi Steve, I have seen other diagrams that also show no connection to pin 16. I questioned their accuracy because of that. Good to know it's factual. Some of the scanners now failing to power up have been used on this car in the past and they did power up then, which makes this hard to figure out. I'll have to get into this again and see if I missed something. Might be a while, as in days to weeks. Thanks until then!
Jul 7, 2021 at 7:33 AM
Avatar
STEVE W.
  • ✓Experienced Mechanic
  • 15,327 POSTS
Yeah, it's strange but that is the OE diagram. The fuses also show no connection for it. Wouldn't be hard to just run a switched power to that pin though.
Jul 7, 2021 at 12:16 PM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.