Control Unit Input Test

WARNING: This page is about a different car, the 2003 Acura 3.2TL. However, it is still accessible from the selected car via links, so may be relevant.

Before testing the dash lights brightness 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 Multiplex Control Unit, Driver's Connector B Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.

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

Fig 4: 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 5: 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 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, the control unit must be faulty; replace it.
Fig 6: Driver's Multiplex Control Unit Input Tests (Connected)
Courtesy of AMERICAN HONDA MOTOR CO., INC.