lost key, need help with new lock cylinder - Toyota Nation Forum : Toyota Car and Truck Forums
Avalon 1st Generation (1995-1999) Specific discussion of the first generation Toyota Avalon

 
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post #1 of 4 Old 12-15-2018, 03:48 PM Thread Starter
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lost key, need help with new lock cylinder

Sister-in-law lost the keys to her 98 Avalon. So I replaced the lock cylinder with a new one. Tried cranking it and it's turning over but It's not cranking and I now see it has the security light blinking. I know this has to do with the Immobilizer. The guy I talked to at the dealership said that since it is older then an 05, the only thing that can be done is replace the ECU since it cant be reprogrammed and we don't have the "master key". I'm trying to see if anyone knows if this is right, cause I don't trust anyone at a dealership.
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post #2 of 4 Old 12-15-2018, 04:22 PM
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The dealership is half correct the ECU does normally need to be replaced (which comes with keys) but there are other options for example getting your ECU programmed.

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post #3 of 4 Old 01-22-2019, 10:04 AM
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71,
Love your pic of your car.

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post #4 of 4 Old 01-22-2019, 10:52 PM
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I had a similar problem when I unhooked my ECU on a dead battery while I was chasing an emissions issue. Key would crank but not fire it up after reconnect.
Turns out even if your ECM is bad, you can't just get another ECM from the junkyard or other donor car, because they used Denso as well as Delco made ECMs for various first gens. An XL would have a different firmware than an XLS... it would have to be the EXACT model ECM for your car to be compatible, and then don't forget you have to get a new key made to program it with.
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