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After a refurbished ECM was installed the car will not start?

Tiny
LOSPADILLA
  • MEMBER
  • 2000 LEXUS RX 300
  • AUTOMATIC
  • 189,000 MILES
I installed a refurbished ECM that I purchased, and it comes programmed and with a key. I followed instructions on how to install it and program the key to the car. The car won't start! The locksmith that came to my house to cut the new key told me that the anti-theft might have kicked on. Which it did but the new key won't help anything, but the old keys can. With the old key I got the anti-theft lock off but as soon as I try to use the new key it kicks back on. I put the old ECM back in my car and it turns right on. Someone told me I probably need to get my ECM and key programmed again. This isn't cheap so I need a more certain answer. Please help! TIA
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Sunday, August 14th, 2022 AT 11:23 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,895 POSTS
The fact that it starts witht he old set up means the new ECM and keys are not programmed correctly. Here are the instructions on how to replace the ECM and how to test the ignition key coils, let me know what happens.
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Monday, August 15th, 2022 AT 9:17 AM

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