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Door Multiplex Control Unit

Remove driver's door trim panel. Disconnect both harness connectors from door multiplex control unit. Inspect connector terminals for damage or corrosion. Repair or replace as necessary. Using a DVOM, perform door multiplex control unit input test. See Fig 1 . If all input tests are okay, multiplex control unit may be defective. Substitute known-good multiplex control unit for control unit most closely associated with fault. Retest system. If problem still exists, substitute known-good multiplex control unit for next most likely faulty control unit.

Fig 1: Door Multiplex Control Unit Input Test
G00029396Courtesy of AMERICAN HONDA MOTOR CO., INC.