Need the definition of a "multiplex unit (not to be confused with Multipass).
1) what is it?
2) what does it look like?
3) where is it located?
4) can your average village idiot, with limited dexterity, replace it?

REALLY, REALLY need any and all info! Thanks in advance!

Lockless in Texas

 

It is the giant fuse panel under the dash on the driver's side.

 

Thanks. I had a rear lock go wacko on me and was causing a phantom drain on my battery. That's what the shop said I needed, for $700. Right now it's disconnected.

 

The excessive parasitic drain is usually is more likely due to the faulty rear lock or wiring, not the multiplex control unit.

The multiplex integrated control unit (micu) system is a body controller area network (B-CAN) system.

Wake-up Mode and Sleep Mode
The B-CAN system has two operating modes to reduce parasitic draw: the wake-up mode and the sleep mode. The system was probably staying in the wake-up mode due to faulty rear lock, causing the excessive parasitic drain. If that rear lock switch sticks in either its lock or unlock position (the input signal stays on), the system won’t return to the sleep mode. This will keep an excessive parasitic draw on the battery that will kill it in short order.