Door Multiplex Control Unit Input Test

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NOTE: Check the No. 22 (120 A), No. 23 (60 A), No. 15 (40 A) fuse in the under-hood fuse/relay box before troubleshooting.

Before troubleshooting the door multiplex control unit, troubleshoot the multiplex integrated control system first, using B-CAN System Diagnosis Test mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).
Turn the ignition switch to LOCK (0).
Remove the power window master switch (see PASSENGER'S POWER WINDOW MOTOR TEST ).
Disconnect the 23P connector from the power window master switch (door multiplex control unit).

Fig 1: Identifying Door Multiplex Control Unit Connector Terminals
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 6.

With the connector still disconnected, do these input tests at the following connector.

If the test indicates a problem, find and correct the cause, then recheck the system.
If the input tests prove OK, Go to step 7.

WIRE TEST CONDITION REFERENCE CHART

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
16	BRN/BLK	Under all conditions	Check for continuity between terminal No. 16 and under-dash fuse/relay box connector J (21P) terminal No. 4: There should be continuity.	An open or high resistance in the wire

Reconnect the connector to the door multiplex control unit, and do these input tests at the following 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 (see POWER WINDOW MASTER SWITCH REPLACEMENT ).

WIRE TEST CONDITION REFERENCE CHART

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
1	BLK	In all ignition switch positions	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G501) An open or high resistance in the ground wire
15	WHT/RED	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. 7 (7.5 A) fuse in the under-dash fuse/relay box An open or high resistance in the wire
20	YEL	Ignition switch ON (II)	Measure the voltage to ground: There should be battery voltage.	Blown No. 21 (7.5 A) fuse in the under-dash fuse/relay box An open or high resistance in the wire