Code Reader Says Cannot Communicate

[rlan]

I have a 99 Lexus rx 300. DLC pin 16 12 v pin 4 5 ground pin 7 7v.

[eugene.s]

Which code reader model it cannot communicate with?

[rlan]

I tried 4 different types. One was a snap on scanner. I don't remember the others.

[eugene.s]

Just returned from leave. You probably need to try professional scanners ($200+).The cheap ones (~$20) really often lose communication. Go to a dealer or AutoParts etc.

The alternative is to pre-set whatever software coming with a cheap adapter to your particular market (US, Japan or Europe).

[VBdenny]

Go to an AutoZone or Advance They have scanners you can use for free.