Door Multiplex Control Unit Input Test

NOTE: Make sure the ignition switch is OFF before disconnecting the driver's door switch panel.

Remove the driver's door switch panel (see FRONT DOOR PANEL REMOVAL/INSTALLATION ).
Disconnect the connectors from the power window master switch.

Fig 1: Identifying Door Multiplex Control Unit Connector A (22P) & B (14P)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
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.

Reconnect the connector and, make these input tests at the connector.

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.

DOOR MULTIPLEX CONTROL UNIT INPUT TEST - REFERENCE DATA

Cavity	Wire	Test condition	Test: Desired result	Possible cause if result is not obtained
B3	WHT/RED	Under all conditions	Check for voltage to ground: There should be battery voltage.	Blown No. 7 (7.5 A) fuse in the under-dash fuse/relay box An open in the wire
B11	GRN/WHT	Under all conditions	Check for voltage to ground: There should be battery voltage.	Blown No. 27 (30 A) fuse in the under-dash fuse/relay box An open in the wire
B14	BLK	Under all conditions	Check for voltage to ground: There should be less than 1 V.	Poor ground (G501) An open in the wire

Disconnect the connector from the door multiplex control unit, and make these input tests at the connector.

If any test indicates a problem, find and correct the cause, then recheck the system.
If all the input tests prove OK, the door multiplex control unit must be faulty. Replace the power window master switch.

DOOR MULTIPLEX CONTROL UNIT INPUT TEST - REFERENCE DATA

Cavity	Wire	Test condition	Test: Desired result	Possible cause if result is not obtained
A5	BRN/BLK	Under all conditions	Check for continuity between A5 terminal and the under-dash fuse/relay box connector J (21P) No. 4 terminal: There should be continuity.	An open in the wire