Honda 2002 Accord Manual page 1286

Multiplex Control System
Troubleshooting (cont'd)
M u l t i p l e x Control Unit, Passenger's
Test all the switches in the following order, otherwise the
test results maybe inaccurate:
Front passenger's door lock knob switch (LOCK)
Front passenger's key cylinder switch (LOCK)
Front passenger's door lock knob switch (UNLOCK)*
Front passenger's key cylinder switch (UNLOCK)
Front passenger's door lock switch (UNLOCK/LOCK)
Right rear door lock knob switch (UNLOCK)*
Front passenger's door switch (OPEN)
Right rear door switch (OPEN)
Keyless transmitter (LOCK)
Keyless transmitter (UNLOCK)
Keyless transmitter (TRUNK)
Security input for the radio. Test by disconnecting and
reconnecting the radio connector.
*When testing the passenger's door lock knobs, be sure
all other passenger lock knobs are in the locked position.
M u l t i p l e x Control U n i t , D r i v e r s _
Dash lights brightness controller (ROTATE)
Driver's door switch (OPEN)
Left rear door switch (OPEN)
Left rear door lock knob switch (UNLOCK)
Trunk latch switch (OPEN)
Trunk key cylinder switch (UNLOCK)
Driver's seat belt switch (BUCKLED)
Windsheild wiper/washer switch (except MIST switch)
Brake pedal position switch (Brake switch) (PRESSED)
Parking brake switch (ON)
Hood switch (OPEN)
Headlight or combination switch (ON)
M u l t i p l e x Control U n i t , Door
Test all the switches in the following order, otherwise the
test results maybe inaccurate:
Driver's door lock knob switch (LOCK)
Driver's key cylinder switch (LOCK)
Driver's door lock knob switch (UNLOCK)
Driver's key cylinder switch (UNLOCK)
Driver's door lock switch (LOCK/UNLOCK)
Power window master switch (not the passenger's
switches)
The key cylinder switches should only beep/flash when
turned to LOCK or UNLOCK. If they beep/flash when
returning to the center position, the switch is defective
or misaligned. Adjust or replace the affected key
cylinder switch.
16. Check 2 or 3 more circuits listed for that control unit.
Does the ignition key light blink and the beeper
beep for each additional circuit?
YES—The additional circuits are OK. Repair the
short or open in the circuit that failed the test in the
proceeding step. Refer to the test(s) for that
individual system. •
NO —Multiple failed circuits can mean that the
control unit has failed, but without triggering a DTC.
Test a few more circuits. If they also fail, substitute
a known-good control unit, then recheck. If the
sytem works properly, the original control unit is
faulty; replace it. If there is still a malfunction,
substitute a known-good control unit for the next
most likely faulty control unit, then recheck. If the
sytem works properly, that control unit is faulty;
replace it.B
22-140