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Test 3

  1. Ensure ignition is off. Check continuity in communication line (Red/Yellow wire) between Passenger's Multiplex Control Unit Gray 26-pin connector terminal A9 and Driver's Multiplex Control Unit Gray 26-pin connector terminal B22. If continuity does not exist, check for open in Red/Yellow wire. If continuity exists, go to next step.
  2. Turn ignition on. Using a voltmeter, check communication line voltage at Passenger's Multiplex Control Unit Gray 26-pin connector terminal A9 (Red/Yellow wire). Voltage should read 4.8-6.0 volts. If voltage is as specified, replace Passenger's Multiplex Control Unit with a known-good unit and retest system. If system still does not operate properly, replace Driver's Multiplex Control Unit with a known-good unit and retest system. If voltage is not as specified, go to next step.
  3. If voltage is more than 6.0 volts, check for short in Red/Yellow wire and for poor connection or faulty circuit at receiver side unit. See WIRING DIAGRAMS  . If voltage is less than 4.8 volts, check for short to ground and for poor connection or faulty circuit at transmitter side unit.
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