Honda EP3 Service Manual page 1047

Multiplex Control System
Multiplex Control Unit lnput Test (cont'd)
3. Inspect the connector and socket terminals to be sure they are all making good contact
. l f t h e t e r m i n a l s a r e b e n t , l o o s e o r c o r r o d e d , r e p a i r t h e m a s n e c e s s a r y , a n d r e c h e c k t h e s y s t e m
. llthe terminals look OK, go to step 4.
4. Reconnectthe connectorstothe under dash fuserelay box, and make surethese inputtests atthe appropriate connectors on lhe under-
dash fuse/relav box.
. lf any test indicates a problem, {ind and correct the cause, then recheck the system
. lf allthe input tests prove OK, the multiplex control unit must be faulty. Replace the under_dash fuse/relay box assembly
Cavitv Wire
Test condition Test: Desired .esult
r
Possible cause if resullE qS!q!!e!!ed
J 4
BLK
[ J n d e r a l l c o n d i t i o n s
Check {or voltage 1o ground:
T h e r c s h o l l . l h e 1 V o r l e s s
Poor ground (G20'l)
An ooen in the wire
Y6 BLK
l J n d e r a l l c o n d i t i o n s
C h e c k f o r v o l t a g e t o g r o u n d :
T h e r e s h o u l d b c 1 V o r l e s s .
Poor ground 1G501)
An ooen in the wire
Y1
BFNryEL Parking brake lever
down, turn the
igntion switch ON (ll)
Check for voltage to ground:
There should be battery voltage
while the Brake system indicator is
on forthe buld check.
An open in the wire
Shortto ground
Faulty ABS modulatorcontrol unit
Check for voltage to ground:
There should be 1V or less when the
J 2
WHT/RED U n d e r a l l c o n d i t i o n s Check for voltage to groundi
There should be baftery voltage.
Blown No.9 (10A)fuse in the under'hood
fuse/relay box
An oncn in rhc wire
Cavitv
Test condition
Tesi: Oesired result
Possible cause ifresult is notobtained
o3
GRN
Driver's door open
C h e c k f o r v o l t a g e t o g r o u n d :
T h e r e s h o u l d b e 1 V o r l e s s -
Faulty driver's door switch
An ooen in the wire
Driver's door closed
C h e c k f o r v o l t a g e t o g r o u n d :
T h e r e s h o u l d b e 5 V o r m o r e .
Faulty driver's door switch
Short to qround
O4
LT GRN/RED Passenger's door
C h e c k . f o r v o l t a g e 1 0 g r o u n d :
T h e r e s h o u l d b e 1 V o r l e s s .
Faulty passenger's door switch
An ooen inthewire
Passenger's door
Check for voltage to ground:
There should be 5 V or more.
Faulty passenger's door switch
Short to oround
o s I ] l
. l
4.,
F 1
F8
GRN/ORN
GRN/ORN
GRN/RED
(USA)
GRN/ORN
(Canada)
Parking brake lever
C h e c k f o r v o l t a g e t o g r o L r n d :
T h e r e s h o r l . l b e 1 V o r l e s s .
F a u l t y p a r k i n g b r a k e s w i t c h
. A n o o e n i n t h e w i r e
C h e c k f o r v o l t a g e t o g r o u n d :
T h e r e s h o u l d b e 5 V o r m o r e .
. Faulty parking brake switch
Shortto ground
o5
BLU/RED lgnition switch ON (ll),
driver's seat belt is
C h e c k f o r v o l t a g e t o g r o u n d :
T h e r e s h o u l d b e 1 V o r l e s s .
Faulty driver's seat belt switch
P o o r g r o u n d ( G 5 5 1 )
An oDen in the wire
Q6
BLU/RED lgnition switch ON (ll)
driver's seat belt is
buckled.
Check {or voltage to ground:
There should be 6 V or more.
Faulty driver's seat belt switch
Shortto ground
P 1 8
RED
H",= Check for voltage to ground:
There sho0ld be 1V or less-
f -9*:li:'^:**:':s*:*
Faulty hatch latch swrtch
Poor ground (G552)
An open in the wire
F a u l t y h a t c h l a t c h s w i t c h
X5 l g n i r i o n k e y i n t h e
C h e c k f o r v o l i a g e t o g t o u n d :
i g n i t o n s w i t c h
T h p r e s h o u l d b e I V o r l c s s
l g n r t r o n k e v o u r o { t h e
C h e c k f o r v o l l a g e t o g r o u n d :
. F a u l t y i g n i t i o n k e y s w i t c h
. P o o r g r o u n d ( G 4 0 1 )
. A n o p e n i n t h e w i r e
I : [11y.'::i':::1"'
**6
\
22-176