Driver's Multiplex Control Unit
- Remove driver's underdash fuse/relay box. See DRIVER'S UNDERDASH FUSE/RELAY BOX
under REMOVAL & INSTALLATION. Remove driver's multiplex control unit from driver's underdash fuse/relay box. Disconnect control unit connectors. Inspect connectors and terminals. Check for bent, loose, or corroded terminals. Perform first part of driver's multiplex control unit input tests. See Fig 1
. Repair as necessary and recheck system operation. If driver's multiplex control unit inputs are okay, go to next step.
- Reconnect driver's multiplex control unit to underdash fuse/relay box. Perform second part of input tests at back of fuse/relay box (backprobe). See Fig 1
. Repair as necessary.
- If all tests have proven okay, driver's multiplex control unit must be faulty. Replace driver's multiplex control unit and recheck system operation.
Courtesy of AMERICAN HONDA MOTOR CO., INC.