Honda 2004 Odyssey Service Manual page 1927

Multiplex Control System
Troubleshooting (cont'd)
Inputs monitored by Passenger's Multiplex Control Unit
Switch/Circuit
Front passenger's key
1
cylinder switch
(LOCK/UNLOCK)
Front passenger's door
lock knob switch
(UNLOCK EX models)
Right rear sliding door
lock knob switch
(UNLOCK EX models)
Front passenger's door
lock switch (LOCK/
UNLOCK)
Front passenger's door
switch (OPEN)
Right rear sliding door
switch (OPEN)
Tailgate key cylinder
switch
Security input
(DISCONNECTED EX
models)
1: The multiplex system should flash the ignition
key light and sound the beeper each time when the
key is turned to the LOCK or UNLOCK position, and
should not flash/beep as the key is returned to the
neutral position.
Did the multiplex control system conf irm all the
circuits by f lashing the ignition key light and
sounding the beeper?
YES The multiplex system is OK. If the symptom
is still present, go to the input test for the system
with the problem (see these items), or refer to
multiplex input test (see page 22-250).
• Power door locks (see page 22-267)
• Security (EX models) (see page 22-267)
• Keyless (EX models) (see page 22-267)
• Power windows (includes key-off timer
operation) (see page 22-208)
• Entry light control, Key light timer
• Windshield wiper controls (front and rear)
• Automatic lights off (EX models)
• Reminder chimes (Key-in, seat belt, lights-on)
• Dash lights brightness control (see page 22-154)
• Engine oil pressure indicator (see page 22-110)
NO Find the open or short in the circuit that was
not confirmed by the multiplex control system. If
the circuit is OK, replace the multiplex control unit
that monitors the circuit.
22-248 22-248
Note:
Turn the key two times
consecutively to each position
(LOCK/UNLOCK) to prevent
input from lock knob switches
causing false input
confirmations.
Start this test with both lock
knobs in the locked position.
Unlock one lock knob at a time,
and then return it to the locked
position before testing the next
lock knob switch.
Test by disconnecting then
reconnecting the Radio,
Navigation Display Unit, RES
display unit or RES DVD player
connector.
(see page 22-140)
(see page 22-226)
(see page 22-110)
(see page 22-110)
Communication Line Test
BRN Wire Communication Line Test
1. Remove the driver's multiplex control unit from the
driver's under-dash fuse/relay box.
2. Carefully pry off driver's door switch trim (see page
20-7).
3. Disconnect door multiplex connector A (20P).
4. Check for continuity between No. 2 terminal of the
driver's under-dash fuse/relay box socket and
No. 15 terminal of the door multiplex control unit
connector A (20P).
DRIVER'S UNDER-DASH FUSE/RELAY BOX SOCKET
DOOR MULTIPLEX CONTROL UNIT CONNECTOR A (20P)
BRN
Is there continuity?
YES Replace the multiplex control unit most
closely related to failure.
NO Repair an open in the wire between the door
multiplex connector and the driver's under-dash
fuse/relay box. If the wire is OK, replace the under-
dash fuse/relay box.