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Checking Wake-Up Communication Line

  1. Turn ignition off. Remove passenger's multiplex control unit. Passenger's multiplex control unit is located behind right kick panel. Disconnect passenger's multiplex control unit Gray 26-pin connector "A". Remove driver's underdash fuse/relay box located under instrument panel. See DRIVER'S UNDERDASH FUSE/RELAY BOX  under REMOVAL & INSTALLATION. Disconnect driver's multiplex control unit from underdash fuse/relay box. Disconnect driver's multiplex control unit Gray 26-pin connector "B". Go to next step.
  2. Check continuity of driver's and passenger's multiplex control unit wake-up communication line. Check continuity of Pink/Blue wire between passenger's multiplex control unit Gray 26-pin harness connector "A" terminal No. 10 and driver's multiplex control unit Gray 26-pin harness connector "B" terminal No. 10. See WIRING DIAGRAMS  . If continuity exists, go to next step. If continuity does not exist, repair open in driver's and passenger's multiplex control unit wake-up communication line.
  3. Reconnect passenger's multiplex control unit and driver's multiplex control unit connectors. Turn ignition on. Check voltage between each multiplex control unit with wake-up communication lines connected and system in sleep mode and wake-up mode. Backprobing, check for voltage between ground and passenger's multiplex control unit Gray 26-pin connector "A" terminal No. 10 (Pink/Blue wire) and driver's multiplex control unit Gray 26-pin connector "B" terminal No. 10 (Pink/Blue wire), individually. See WIRING DIAGRAMS  . 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.
  4. 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. Repair or replace as necessary.
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