Door Multiplex Control Unit

7. Turn the ignition switch to LOCK (0).
8. Remove the power window master switch (see POWER WINDOW MASTER SWITCH REPLACEMENT ).
9. Disconnect the 37P connector from the power window master switch.

Fig 1: Identifying Power Window Master Switch 37P Connector Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.
10. 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 11.

11. With the connector still disconnected, do the following input test.

If any test indicates a problem, find and correct the cause, then recheck the system.

If the input test proves OK, go to step 12.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
27	BRN	Disconnect the front passenger's power window switch 37P connector	Check for continuity between door multiplex control unit 37P connector terminal No. 27 and front passenger's power window switch 37P connector terminal No. 29: There should be continuity.	An open in the UART wire

12. Reconnect the 37P connector to the door multiplex control unit, and do the following input tests.

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 13.

Cavity	Wire	Test condition	Test: Desired result	Possible cause if desired result is not obtained
32	BLK	In all ignition switch positions	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G401) An open or high resistance in the ground wire
37	BLK	In all ignition switch positions
13	WHT	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. 23 (10 A) fuse in the under-hood fuse/relay box Faulty under-hood fuse/relay box An open or high resistance in the wire
14	YEL	Ignition switch ON (II)	Measure the voltage to ground: There should be battery voltage.	Blown No. 36 (10 A) fuse in the under-dash fuse/relay box Faulty under-dash fuse/relay box An open or high resistance in the wire
25	WHT	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. 26 (20 A) fuse in the under-dash fuse/relay box Faulty under-dash fuse/relay box An open or high resistance in the wire
28	PNK	Driver's door key cylinder switch in LOCK	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G401) or an open in the ground wire Faulty driver's door key cylinder switch An open or high resistance in the wire
28	PNK	Driver's door key cylinder switch in neutral or UNLOCK	Measure the voltage to ground: There should be at least 5 V.	Faulty driver's door key cylinder switch A short to ground in the wire
29	WHT	Driver's door key cylinder switch in UNLOCK	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G401) or an open in the ground wire Faulty driver's door key cylinder switch An open or high resistance in the wire
29	WHT	Driver's door key cylinder switch in neutral or LOCK	Measure the voltage to ground: There should be at least 5 V.	Faulty driver's door key cylinder switch A short to ground in the wire
30	BRN	Driver's door lock knob switch in LOCK	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G401) or an open in the ground wire Faulty driver's door lock knob switch An open or high resistance in the wire
30	BRN	Driver's door lock knob switch in UNLOCK	Measure the voltage to ground: There should be at least 5 V.	Faulty driver's door lock knob switch A short to ground in the wire
31	RED	Driver's door lock knob switch in UNLOCK	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G401) or an open in the ground wire Faulty driver's door lock knob switch An open or high resistance in the wire
31	RED	Driver's door lock knob switch in LOCK	Measure the voltage to ground: There should be at least 5 V.	Faulty driver's door lock knob switch A short to ground in the wire