2002 Acura 3.2TL BaseFACTORY OEM SERVICE PROCEDURE

Multiplex Control Unit: 3.2TL

  1. Remove driver's underdash fuse/relay box. See DRIVER'S UNDERDASH FUSE/RELAY BOX (3.2TL)  under REMOVAL & INSTALLATION. Remove driver's multiplex control unit from driver's underdash fuse/relay box. Inspect connectors and terminals. Check for bent, loose, or corroded terminals. Repair as necessary and recheck system operation. If connectors and terminals are okay, perform driver's multiplex control unit input tests. See Fig 1 and Fig 2 . If input tests are okay, go to next step.
  2. Remove passenger's underdash fuse/relay box. See PASSENGER'S UNDERDASH FUSE/RELAY BOX (3.2TL)  under REMOVAL & INSTALLATION. Remove passenger's multiplex control unit from passenger's underdash fuse/relay box. Inspect connectors and terminals. Check for bent, loose, or corroded terminals. Repair as necessary and recheck system operation. If connectors and terminals are okay, perform passenger's multiplex control unit input tests. See Fig 3 . If input tests are okay, go to next step.
  3. Remove driver's door panel. See DOOR PANEL  under REMOVAL & INSTALLATION. Remove power window master switch/driver's door multiplex control unit. Driver's door multiplex control unit is built into power window master switch. Go to next step.
  4. Disconnect driver's door multiplex control unit 20-pin connector. Inspect connectors and terminals. Check for bent, loose, or corroded terminals. Repair as necessary and recheck system operation. If connectors and terminals are okay, perform driver's door multiplex control unit input tests. See Fig 4 . If input tests are okay, go to next step.
  5. If all input tests are okay, one of the control units may be intermittently at fault. Substitute a known-good control unit for the one most likely at fault and recheck system. If system works properly, replace original control unit. If a malfunction still exists, substitute a known-good control unit for the next most likely to be at fault. Recheck system operation. If system works properly, replace original control unit. If a malfunction still exists, substitute a known-good control unit for the next most likely to be at fault. Recheck system operation.
Fig 1: Driver's Multiplex Control Unit Input Terminals (3.2TL)
G00215599Courtesy of AMERICAN HONDA MOTOR CO., INC.
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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