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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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