Multiplex Control System: Troubleshooting - Honda EP3 Service Manual

Multiplex Control System
Troubleshooting
Mode 1 Tset
1. Remove the driver's dashboard lower cover {see
page 20-59).
2. Check the No. 9 ( 10A) fuse in the under-hood fuse/
relay box and the No. 10 (7.5A) fuse in the under-
dash fuse/relay box.
Are the fuses OK?
YES-Go to step 2.
N O - F i n d a n d r e p a i r t h e c a u s e o f t h e b l o w n f u s e . !
3 . T u r n t h e i g n i t i o n s w i t c h O N ( l l ) . l f t h e d r i v e r ' s
seatbelt is unbuckled the seat belt reminder will
c h i m e 6 t i m e s .
4. Set the ceiling light to the center position and close
a l l t h e d o o r s .
5. Connect the specialtoolto the multiplex inspection
conneclor.
6. After about 5 seconds the spotlight and ceiling light
should come on for 2 seconds, go out, then blink on
for 0.2 second to show the system is now in mode
1 .
Did the spotlight and ceiling light indicate mode
1 ?
YES-Go to step 8.
NO Go to step 7.
22-172
-
7. Check for continuity between terminal 4ofthe
under-dash fuse/relay box connector J and body
g r o u n d .
ls there continuity?
YES Replace the under-dash fuse/relay box.l
N O - R e p a i r t h e o p e n i n t h e w i r e . l f t h e w i r e i s o k ,
r e p a i r G 3 0 1 . 1
8. lf ther are any DTCS present, the spotlight and
ceiling light will blink to indicate the DTC(S). lf more
than one DTC is present, the DTCS will be displayed
in ascending order, lf there are no DTCS the
s p o t l i g h t a n d c e i l i n g l i g h t w i l l n o t b l i n k a g a i n a f t e r
t h e m o d e 1 i n d i c a t i o n .
Are there any DTCg?
YES Go to step 9.
NO Go to the Mode 2 test.
9. Troubleshoot the DTC(S) in the order indicated
u s i n g t h e f o l l o w i n g c h a r t s .
lf a faulty control unit is suspected, substitute it
with a known food part and recheck for DTCS,
. lf the DTC(s) isstill present. go to the next step
listed for the DTC.
. lf the DTC(S) is no longer present replace the
o r i g i n a l p a r t .