Immobilizer Keeps Coming On (wont start)

[MyL3xus]

2008 Lexus IS250, 110k Miles, Frequently Serviced.

1) Recently Changed FOB battery as it was dead
2)Got the car washed, cleaners drove it back, when I tried to start it the next day it would only crank but not start.
Used my Tech Steam to pull up codes and it showed Immobilizer was on, great...cleared the code and worked like a charm for 50 miles or so. Parked again overnight and next morning immobilizer is back enabled and will not clear this time. Key is detected fine, side views illuminate when next top the car, doors unlock just fine with remote as well as when hand is on handle.

See attached errors. (VSC AND AFS has been on for months, can ignore them)
Also, is pinning 4&13 and waiting 30 minutes a safe way to reprogram ECU with this model?

All Codes.pdf Immobilizer Info.pdf Immobilizer.pdf VSC.pdf

Edited June 15, 2022 by MyL3xus

[RX400h]

I noticed that a Lexus mechanic in justanswer.com suggested to someone having a no-start condition (2008 IS250) to bring the car to a dealership to have the immobilizer/transponder system reprogrammed. He stated that there is "no other way". It is puzzling why this would all-of-a-sudden happen.

[MyL3xus]

6 minutes ago, RX400h said:

I noticed that a Lexus mechanic in justanswer.com suggested to someone having a no-start condition (2008 IS250) to bring the car to a dealership to have the immobilizer/transponder system reprogrammed. He stated that there is "no other way". It is puzzling why this would all-of-a-sudden happen.

Thanks for the info. Unfortunately where I live there is no dealership or specific Toyota/Lexus garages. Few places are saying a bad battery or bad alternator can throw out bad voltages and cause it.

[RX400h]

I did see an initial reply by the Lexus mechanic in which he suggested checking the battery and its connections but I assumed you did this. Weak batteries CAN cause all kinds of weird issues.

[Is2S0]

Any fix? Have same issue after a car wash. Thinking about changing out the immobilizer. Or should I go with resetting the ecu with the pin method and waiting 30 minutes? 
 

thanks 

[MyL3xus]

22 hours ago, Is2S0 said:

Any fix? Have same issue after a car wash. Thinking about changing out the immobilizer. Or should I go with resetting the ecu with the pin method and waiting 30 minutes? 
 

thanks 

Take off the lower plastic housing where the immobilizer is and allow it to air dry in the sun for up to 3 days, if its possible keep your car doors open during the day. Was able to contact a dealer who told me 99% of the time they are able to self reinitiate after shorting. Mine was caused by a faulty seal on the lower windshield where the runoff goes right over the immobilizer. Got my windshield resealed and hasn't happened since and I've been in the cash wash multiple times.