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i would like to power on the obd device without ignition to vehicle. Am trying to establish some connection for programming work buy connecting to my laptop. Any way to do this?

  • If you get a batter powered or USB connected device it should be able to power up without electricity from the vehicle – GdD Nov 12 '19 at 11:37
  • @Moab That is not true. The power at the obd2 has nothing to do with the communication lines. You could power your tool externally and communicate all the same. I do this often when programming keys because I do not feel like changing the fuse which is commonly blown. (Its connected with cigar/power outlets on many models). – narkeleptk Apr 10 at 17:17
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I'm not real sure what your asking but if your just trying to power the tool on the bench:

-If your scan tool has an external plug for power then you simple feed it 12VDC.

-If your tool does not have external power supply port then you can power it using 12VDC with + clipped to pin 16 and - clipped on pins 4 & 5 inside the tools obd2 connector.

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I would make a male/female adapter to go between the port and the obd device.

That way you can supply the 12v needed and not have to get to any of the pins with clips that can come off. Will be much more secure.

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