Mpx-b
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Driver School Candidate
Joined: Jan 2019
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From: GA
Mpx-b
hello. I’m new here but have had my 99 ls400 for about 8 months. Recently I have had a problem with a voltage drop and parasitic drain that was found to be from the MPX-B fuse. What is the best way to go about finding my problem with this fuse. As I know it is conected to a lot of systems in the car. My driver rear window does not have the automatic function as it should. The pass window has a typical Toyota issue of rolling up some then going back down when using the auto up. any suggestions???
CL Community Team
Joined: Aug 2011
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From: Japan
Sounds like one or more of following computers are always working, MPX body computer, MPX door computers ( each door has it's own computer and there are totally 4), tilt/telescopic computer and seat position control computer. Disconnecting one by one would be the way to troubleshoot. Remember that all these computers are getting power from the battery without any switch. Every time when you disconnect any of these, you need to remove the negative terminal of the battery. I'd start with the door computer which has the up/down problem.
Thread Starter
Driver School Candidate
Joined: Jan 2019
Posts: 3
Likes: 0
From: GA
Sounds like one or more of following computers are always working, MPX body computer, MPX door computers ( each door has it's own computer and there are totally 4), tilt/telescopic computer and seat position control computer. Disconnecting one by one would be the way to troubleshoot. Remember that all these computers are getting power from the battery without any switch. Every time when you disconnect any of these, you need to remove the negative terminal of the battery. I'd start with the door computer which has the up/down problem.
I dont think it would be my tilt tilt as it hasn’t worked the whole time I’ve had the car
Driver
Joined: Oct 2023
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From: UT
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