System Description: Notes

The multiplex control system has four internal functions:

• Multiplexing (send 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 system DTCs, 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
• Power Door Lock
• Gauge control module (temperature gauge and indicators)
• HVAC (Compressor control)
• Key-in reminder
• Lights-on reminder
• Seat belt reminder
• Keyless entry