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− S6M6A00J00050600000CAAT00 Multiplex Communication Wake-up and Sleep Fail-safe 22-188 Multiplex Control System System Description The multiplex control system has four internal • 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) input lines) The system controls the function of these circuits: • Entry light control (ignition key light and ceiling light) lights • HVAC (compressor and fan control) To reduce the number of wire harnesses, digital signals • 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 signals. • The transmitted signal is converted to a switch signal at the receiving unit, and it operates the related • There are exclusive communication lines between the ECM/PCM, the gauge assembly, the keyless The multiplex control system has ‘‘wake-up’’ and • In the sleep mode, the multiplex control unit stops functioning (communication and CPU control) when it • As soon as any operation is requested (for example, a door is unlocked), the related control unit in the sleep • When the ignition switch is turned OFF, and the driver’s or front passenger’s door is opened, then • If any door is open, the sleep mode will not function. not function. • When in sleep mode, the draw is reduced from 70 80 mA to less than 10 mA. To prevent improper operation, the multiplex control 05/06/27 18:06:12 61S6M040_220_0189 |