Control Unit Input Test

Before testing, troubleshoot the multiplex control system (see TROUBLESHOOTING ).
Remove the driver's multiplex control unit from the driver's under-dash fuse/relay box.
Inspect the connector and socket terminals to be sure they are all making good contact.
- If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.
- If the terminals look OK, go to step 4.
Fig 1: Identifying The Driver's Multiplex Control Unit 24P Connector A Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig 2: Identifying The Driver's Multiplex Control Unit 22P Connector B Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig 3: Identifying The Driver's Under-Dash Fuse/Relay Box 10P Connector E Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig 4: Identifying The Driver's Under-Dash Fuse/Relay Box 20P Connector M Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.
With the driver's multiplex control unit still disconnected, make these input tests at the connector and driver's under-dash fuse/relay box sockets.
- If any test indicates a problem, find and correct the cause, then recheck the system.
- If all the input tests prove OK, go to step 5.
Fig 5: Control Unit Input Test Table (1 Of 2)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Reconnect the driver's multiplex control unit to the driver's under-dash fuse/relay box, and perform the following input tests at the appropriate connectors on the back of the driver's under-dash fuse/relay box.
For driver's under-dash fuse/relay box connector socket location (see FUSES & CIRCUIT BREAKERS ).
- If any test indicates a problem, find and correct the cause, then recheck the system.
- If all the input tests prove OK, the driver's multiplex control unit must be faulty, replace it.
Fig 6: Control Unit Input Test Table (2 Of 2)
Courtesy of AMERICAN HONDA MOTOR CO., INC.