Control Unit Input Test

Before testing the entry light control functions, troubleshoot the multiplex control system (see MULTIPLEX CONTROL SYSTEMS article).
Multiplex Control Unit, Driver's:
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 Fuse/Relay Box Socket Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig 2: Identifying Driver's Under-Dash Fuse/Relay Box Connector A Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig 3: Identifying Driver's Under-Dash Fuse/Relay Box Connector O Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.
With the driver's multiplex control unit still disconnected, make these input tests at the connector or driver's under-dash fuse/relay box socket.
- 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 4: Driver's Multiplex Control Unit Input Tests (Disconnected)
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.
- 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 6.
Fig 5: Driver's Multiplex Control Unit Input Tests (Connected)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Multiplex Control Unit, Passenger's:
Remove the passenger's multiplex control unit from the passenger's under-dash fuse/relay box, and disconnect its connector.
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 8.
Fig 6: Identifying Fuse/Relay Box Socket Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig 7: Identifying Passenger's Under-Dash Fuse/Relay Box Connector A Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.