LS - 1st and 2nd Gen (1990-2000) Discussion topics related to the 1990 - 2000 Lexus LS400

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Old 09-15-21, 10:12 PM
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TeeTone
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I have a 1998 LS400, walked up to my car didn't hit the buttons on the remote at all and all the sudden all my windows opened my sunroof opened. Got in my car started it, was able to roll up the driver window and close the sunroof. Passenger window and rear windows are still open. Any advice what could be wrong?

Last edited by TeeTone; 09-15-21 at 10:15 PM. Reason: Mistyped
Old 09-15-21, 10:41 PM
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Yamae
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Originally Posted by TeeTone
I have a 1998 LS400, walked up to my car didn't hit the buttons on the remote at all and all the sudden all my windows opened my sunroof opened. Got in my car started it, was able to roll up the driver window and close the sunroof. Passenger window and rear windows are still open. Any advice what could be wrong?
I worry that the MPX body ECU's internal voltage regulator is failing. I'd check the 5V DC Vcc line using an oscilloscope or simply try to use another unit.

Last edited by Yamae; 09-15-21 at 10:47 PM. Reason: To add a photo
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