System Description: Notes

The multiplex control system has four internal functions:

• Multiplexing (sends multiple signals over shared wires)
• Wake up/sleep modes (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 the following circuits 

• Engine oil pressure indicator
• Lights-on reminder
• Key-in reminder
• Key light timer
• Dash lights brightness control
• Entry light control
• Automatic lights-off
• Power door locks
• Power window (including key-off timer operation)
• Windshield wiper/washer (including speed sensitive intermittent wiper)
• Security alarm
• Rear window intermittent wiper