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Test 1

  1. Ensure ignition is off. Check continuity in communication line (Brown/Yellow wire), between Door Multiplex Control Unit Blue 20-pin connector terminal No. 15 and Driver's Multiplex Control Unit Gray 26-pin connector terminal B23. If continuity does not exist, check for open in Brown/Yellow wire. If continuity exists, go to next step.
  2. Turn ignition on. Using a voltmeter, check communication line voltage at Door Multiplex Control Unit Blue 20-pin connector terminal No. 15 (Brown/Yellow wire). Voltage should read 2.4-4.2 volts. If voltage is as specified, replace Door 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 4.2 volts, check for short in Brown/Yellow wire and for poor connection or faulty circuit at receiver side unit. See WIRING DIAGRAMS  . If voltage is less than 2.4 volts, check for short to ground and for poor connection or faulty circuit at transmitter side unit.
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