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Symptoms Of Faulty Wake Up Communication Line

  1. An open in a communication line will cause most systems to not operate because one multiplex control unit can not wake-up other multiplex control units. Multiplex control units that are not awake will wake-up when a related switch is operated. Turning ignition switch to ON position will wake-up all multiplex control units.
  2. If a communication line is shorted to ground:
    • Driver's and passenger's multiplex control units will not wake-up except when ignition is in ON position and a wake-up signal from door multiplex control unit is received.
    • Driver's multiplex control unit can wake-up by a switch operation related to door multiplex control unit, but passenger's multiplex control unit cannot wake-up by a switch operation.
    • Turning ignition switch to ON position will wake-up all multiplex control units.
  3. If a communication line is shorted to battery voltage:
    • Most systems will not operate because one multiplex control unit cannot wake-up other multiplex control units.
    • Possible blown fuse or a faulty transistor in multiplex control unit.
    • One multiplex control unit can wake-up from a related switch operation, but other multiplex control units can not wake-up.
    • Driver's multiplex control unit can wake-up by a switch operation related to door multiplex control unit, but passenger's multiplex control unit cannot wake-up by a switch operation.
    • Turning ignition switch to ON position will wake-up all multiplex control units.