Honda Civic Service Manual page 908

4. Make these input tests at the connector,
. l f a n y t e s t i n d i c a t e s a p r o b l e m , f i n d a n d c o r r e c t t h e c a u s e , t h e n r e c h e c k t h e s y s t e m .
. lf all the input tests prove OK, the control unit must be faulty. Replace it.
Cavity
Wire
Test condition Test: Desired result
Possible cause if result is not obtained
2 R E D/BLU U n d e r a l l
c o n d i t i o n s
Check for voltage to ground:
There should be battery voltage.
Blown No. 14 (40A) fuse in the
under-hood fuse/relay box
B l o w n N o . 3 { 1 0 A ) f u s e i n t h e
under-dash fuse/relay box
A n o p e n i n t h e w i r e
12
YE L/RE D
lgnition switch
o N ( r )
Check for voltage to ground:
There should be battery voltage.
B l o w n N o . l 2 ( 7 . 5 A ) f u s e i n t h e
under-dash fuse/relay box
An open in the wire
BLK
U n d e r a l l
conditions
C h e c k f o r c o n t i n u i t y t o g r o u n d :
T h e r e s h o u l d b e c o n t i n u i t v .
. P o o r g r o u n d { G 5 0 ' 1 )
. An oDen in the wire
7
BLK
U n d e r a l l
conditions
Check for continuity to ground:
There should be continuitv.
. P o o r g r o u n d ( G 5 0 1 )
' A n o p e n i n t h e w i r e
1 0 REDI/EL
C o m b i n a t i o n
light switch ON
/ =f\\
Check for voltage to ground:
There should be battery voltage.
B l o w n N o . 1 5 ( 1 5 A ) f u s e i n t h e
under-hood fuse/relay box
Faulty headlight relay 2
Faulty combination light switch
An open in the wire
1
RED/B LU
C o m b i n a t i o n
light switch ON
{iD), and
dimmer switch
i n H I G H
Connect a jumper wire between
N o . 3 a n d N o . 1 t e r m i n a l s .
B o t h h e a d l i g h t s ( H I G H ) a n d
h i g h b e a m i n d i c a t o r l i g h t
s h o u l d c o m e o n .
B l o w n b u l b
Faulty low beam cut relay
Faulty combination light switch
Poor ground (G50'l )
An open in the wire
' 1 1
3
RED/BLK
G R N / B L K
C o m b i n a t i o n
light switch ON
(iD), and
dimmer switch
i n H I G H
C o m b i n a t i o n
light switch ON
(iD), and
dimmer switch
i n H I G H
Connect a jumper wire between
N o . 5 a n d N o . 1 1 t e r m i n a l s .
R i g h t h e a d l i g h t ( H I G H ) s h o u l d
c o m e o n .
C h e c k f o r c o n t i n u l t y t o g r o u n d
T h e r e s h o u l d b e c o n t i n u i t y .
. B l o w n b u l b
. Faulty combination light switch
. Poor ground (G 50'1 )
. A n o p e n i n t h e w i r e
. Faulty combination light switch
. P o o r g r o u n d { G 5 0 1 )
. A n o p e n i n t h e w i r e
5
6
G R N / O R N
Parking brake
l e v e r o u l l e d
C h e c k f o r c o n t i n u i t y t o g r o u n d :
There should be continuitv.
Faulty parking brake switch
A n o p e n i n t h e w i r e
8
B L U / R E D
C o m b i n a t i o n
l i g h t s w i t c h O F F
Check for voltage to ground:
There should be battery voltage.
F a u l t y h e a d l i g h t r e l a y s
Short to ground
A n o o e n i n t h e w i r e
WHT/BLU
lgnition switch
o N 0 r )
Attach to ground:
T h e D R L i n d i c a t o r l i g h t s h o u l d
c o m e o n .
. B l o w n N o . 1 0 ( 7 . 5 A ) f u s e i n t h e
under-dash fuse/relay box
. Faulty DRL indicator
. A n o o e n i n t h e w i r e
t 5
G R N / R E D lgnition switch
o N ( | | )
Attach to ground:
T h e b r a k e s y s t e m l i g h t s h o u l d
c o m e o n .
Faulty brake system indicator
A n o p e n i n t h e w i r e
22-77