Multiplex Control System Troubleshooting - Honda 2002 Accord Manual

• BODY •
Troubleshooting
Special Tools Required:
S C S Service Connector 07WAZ-001010A
1. Check the No. 9 (7.5A) fuse in the driver's under-
dash fuse/relay box, and the No. 13 (7.5A) fuse in
the passenger's under-dash fuse/relay box.
Is the fuses OK?
Y E S - G o to step 2.
NO —Find and repair the cause of the blown fuse. I
2. Connect the special tool to the multiplex control
inspection connector (A).
0 7 W A Z - 0 0 1 0 1 0 A
3. Turn the ignition switch ON (II).
If the driver's seat belt is unbuckled, the seat belt
reminder will beep five times.
4. Check self-diagnosis function Mode 1 for a
diagnostic trouble code (DTC). After about 5
seconds, the ignition key light should come on and
the beeper should beep for 2 seconds, then go off
for 0.2 seconds, then blink and beep for 0.2
seconds. This means that you are in Mode 1 of the
self-diagnosis function.
• If the system enters Mode 1, go to step 5.
• If the system does not enter Mode 1, see if the
S C S circuit is working properly. Go to step 6.
O N
O F F -
0 . 2
sec.
0.2 sec.
2 sec.
5. About 1 second after you go into self-diagnosis
Mode 1, the ignition key light and beeper indicate
the DTC, and repeat it every 3 seconds. If there is a
code, it will blink/beep, pause, then repeat the code
as long as the ignition switch is ON (II). If there is
more than one DTC, the system will indicate them
in ascending order, beginning from the DTC with
the lowest numerical value.
Does the ignition key light blink and the beeper
beep?
Y E S - T h e r e is a DTC. Count the blinks/beeps to
find your DTC in the table, then go to step 9 and
check the communication lines.
DTC Cause
1 The driver's unit is not able to receive
signals from the door unit.
2
The driver's unit is not able to receive
signals from the passenger's unit.
3 Malfunction in the driver's unit.
4 Signals from each unit do not match.
(LX and EX control units are not
interchangable)
5 The passenger's unit is not able to receive
signals from the other units.
6 The door unit is not able to receive signals
from the other units.
NO —If the system goes into Mode 1 as described
in step 4, and there is not repeating DTC. Go to step
11.
6. Remove the special tool from the S C S connector.
7. Check for continuity between the No. 1 terminal of
the inspection connector and the A15 terminal in
the driver's multiplex control unit.
Is there continuity?
Y E S - G o to step 8.
NO — Replace the driver's under-dash fuse/relay
box, and recheck for DTC's.B
(cont'd)
22-137