Driver's Multiplex Control Unit
Remove driver's multiplex control unit from fuse/relay block located behind driver's kick panel. Disconnect driver's multiplex control unit connector and check for bent, loose or corroded terminals. Repair as necessary. If all terminals are okay, perform input tests at driver's multiplex control unit and fuse/relay block connectors. See Fig 1 . If all input tests are okay, one of the control units may be faulty. Substitute known-good control unit for control unit most closely related to problem. If problem still exists, substitute known-good control unit for next most closely related control unit. Retest system.