System Description: Notes

The multiplex control system has four internal functions:

• Multiplexing (sends multiple signals over shared wires)
• Wake up/sleep (runs at full power only on demand to reduce battery draw)
• Fail-safe (fixes or ignores faulty signals)
• Self-diagnosis (Mode 1 for the system, Mode 2 for input lines)

The system controls the function of these circuits:

• Entry light control (ignition key light and ceiling light)
• Wiper/washer (intermittent wipe and park functions)
• Interlock system
• Keyless/power door lock
• Gauge assembly, temperature gauge, and indicator lights
• HVAC (compressor and fan control)
• Key-in reminder
• Lights-on reminder
• Seat belt reminder