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Checking Wake-Up Communication Line

  1. Check continuity of wake-up communication line. If continuity exists, go to next step. If continuity does not exist, repair open in wake-up communication line.
  2. Check voltage between each multiplex control unit with wake-up communication lines connected and system in sleep mode and wake-up mode. There should be battery voltage in sleep mode and zero volts in wake-up mode. If voltage is not as specified, go to next step.
  3. Disconnect wake-up communication line connector from one multiplex control unit and check voltage. Reconnect connector and disconnect wake-up communication line connector from other end of circuit and check voltage. If voltage is not as specified at both ends of circuit, wake-up communication line is shorted to another wire or to ground. If voltage is not as specified at only one end of circuit, ensure connector and terminal are okay. If connector and terminal are okay, there may be a wake-up communication line short inside multiplex control unit.
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