IS - 2nd Gen (2006-2013) Discussion about the 2006+ model IS models

08 IS350 doesn't shut off. Multiplex control module issue?

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Old 03-01-23, 09:28 PM
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y4phets4
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Question 08 IS350 doesn't shut off. Multiplex control module issue?

Hi, so my is350 won't turn off after starting the engine. It keeps running no matter how much you press the start/stop button. I have to cut the fuel to engine in order to shut it off. Also when I press lock/unlock button on key, nothing happens. I removed the Multiplex control module behind passenger side glove box and keys work!! but engine no longer starts. I was hoping if I replace the multiplex control module, everything will resolve? But it might need reprogramming?? Anyone replaced this part? -

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Or is there other issue that causes this weird issues? Ty
Old 03-02-23, 09:01 AM
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MikeFig82
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This is some information I found on another thread. Not sure if it will help, or not.

https://www.clublexus.com/forums/is-...n-t-start.html

Diagram from the ES. It should be the same set up for the ISX50.



Last edited by MikeFig82; 03-02-23 at 09:44 AM.
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