Multiplex Communication

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 transmitting unit to the receiving unit as serial data signals.
• The transmitted signal is converted to a switch signal at the receiving unit, and it operates the related component or performs a function.
• There are exclusive communication lines between the ECM/PCM, the gauge control module, the keyless receiver unit, and the under-dash fuse/relay box.