Multiplex Communication
WARNING: This page is about a different car, the 2003 Acura 3.2CL and 2002 Acura 3.2CL. However, it is still accessible from the selected car via links, so may be relevant.
To reduce the number of wire harnesses, digital signals are sent via shared multiplex communication lines rather than sending normal electrical signals through individual wires.
- The input signals from each switch are converted to digital signals at the central processing unit (CPU).
The digital signals are sent from the transmitter unit to the receiver unit as serial signals.
- The transmitted signal is converted to a switch signal at the receiver unit, and it operates the related component.
- There are exclusive communication lines between each of the multiplex control units:
- Door <---> Driver's (between the door and the driver's multiplex control units) Wire color: BRN
- Driver's and Driver's Power Seat Control Unit <---> Passenger's (between the driver's and the passenger's multiplex control units) Wire color: PNK
The control units always communicate via these lines when the system is operating, and they stop communicating when the system is OFF.