Hi all,I got in there last night and someone had just taped the wires together. I put a connector between the two that were broken and everything came on. The check engine light went off too. Thanks for the help!
I will check this tonight.I don't know how the RX300 is, but with my ES300 it was the wiring harness that goes to the rear lights that are mounted in the trunk lid. The wires bend every time the trunk is opened and closed, so one of them had broken. When the wire broke, it caused the car to think it was in reverse and drive at the same time.
If your RX300 has lights mounted in the tail gate, I would have someone look at your rear lights to see if the reverse lights come on when you put the transmission in reverse. If they don't come on, then the problem is probably a broken wire in the light harness. Mine was obvious because someone had attempted to repair the problem by taping the wires together. The break was at a predictable location where the wires bent at every time the trunk was opened. Wouldn't hurt to make sure the light bulbs are all good too.
Hope that helps!
Hi 98Lexus_210K+,I will check this tonight.
Thanks for your help.
Finally I got my problem fixed I think. I got an ECU from Javoosi here in Katy, TX. It has been one week and no CEL yet. Knock on wood.Hi 98Lexus_210K+,
I was out for awhile until today.
I checked and the reverse light is light up when I put the car in reverse.
I had also replaced the PNP switch with a brand new one but I still get the error code 1780. Note that the car is in very good shape (has only57K mi). I checked the wires near the connector and no damage there. Not sure what is now.
Thanks for reading.
Can anyone tell me what exactly a p1780 code is and how can i fixt it . The car is a 99 lexus es300 . Im having a hard time figuring it out ...
I too was having similar problem. When ever the headlight were on and the car was driving (in drive gear) the engine light would come on throwing the p1780 code.