Wiper Relay; Description; Operation - Dodge Sprinter 2006 Manual

8R - 34 WIPERS/WASHERS
WI PER RELAY

DESCRIPTION

Fig. 33 Wiper Relay
1 - HOUSING
2 - TERMINAL (5)
3 - BASE
A wiper r ela y is st a n da r d equ ipm en t on a ll m odels.
Th e wiper r ela y (or in t er m it t en t wipe r ela y) is
loca t ed in a dedica t ed r ecept a cle on t h e bot t om left of
t h e fu se block on t h e u n der side of t h e st eer in g col-
u m n (F ig. 33). Th e wiper r ela y is a con ven t ion a l
In t er n a t ion a l St a n da r ds Or ga n iza t ion (ISO) m icr o
r ela y. Rela ys con for m in g t o t h e ISO specifica t ion s
h a ve com m on ph ysica l dim en sion s, cu r r en t ca pa ci-
t ies, t er m in a l pa t t er n s, a n d t er m in a l fu n ct ion s. Th e
r ela y is con t a in ed wit h in a sm a ll, r ect a n gu la r,
m olded pla st ic h ou sin g. Th e r ela y is con n ect ed t o a ll
of t h e r equ ir ed in pu t s a n d ou t pu t s t h r ou gh t h e
in st r u m en t pa n el wir e h a r n ess con n ect or by five
m a le spa de-t ype t er m in a ls t h a t ext en d fr om t h e bot -
t om of t h e r ela y ba se. Th e ISO design a t ion for ea ch
t er m in a l is m olded in t o t h e ba se a dja cen t t o t h e t er-
m in a l. Th e ISO t er m in a l design a t ion s a r e a s follows:
• 30 (Co m m o n F e e d ) - Th is t er m in a l is con -
n ect ed t o t h e m ova ble con t a ct poin t of t h e r ela y.
• 85 (Co il Gro u n d ) - Th is t er m in a l is con n ect ed
t o t h e gr ou n d feed side of t h e r ela y con t r ol coil.
• 86 (Co il B a tte ry ) - Th is t er m in a l is con n ect ed
t o t h e ba t t er y feed side of t h e r ela y con t r ol coil.
• 87 (N o rm a lly Op e n ) - Th is t er m in a l is con -
n ect ed t o t h e n or m a lly open fixed con t a ct poin t of t h e
r ela y.
• 87A (N o rm a lly Clo s e d ) - Th is t er m in a l is con -
n ect ed t o t h e n or m a lly closed fixed con t a ct poin t of
t h e r ela y.
Th e wiper r ela y ca n n ot be a dju st ed or r epa ir ed. If
t h e r ela y is da m a ged or fa u lt y, it m u st be r epla ced.
OPERA TION
Th e wiper r ela y (or in t er m it t en t wipe r ela y) is a n
elect r om ech a n ica l swit ch t h a t u ses a low cu r r en t
in pu t fr om t h e in t er m it t en t wipe logic cir cu it r y
wit h in t h e fu se block u n der n ea t h t h e st eer in g colu m n
t o con t r ol a h igh cu r r en t ou t pu t t o t h e low speed
br u sh of t h e wiper m ot or. Th e m ova ble com m on feed
con t a ct poin t is h eld a ga in st t h e fixed n or m a lly
closed con t a ct poin t by spr in g pr essu r e. Wh en t h e
r ela y coil is en er gized, a n elect r om a gn et ic field is
pr odu ced by t h e coil win din gs. Th is elect r om a gn et ic
field dr a ws t h e m ova ble r ela y con t a ct poin t a wa y
fr om t h e fixed n or m a lly closed con t a ct poin t , a n d
h olds it a ga in st t h e fixed n or m a lly open con t a ct
poin t . Wh en t h e r ela y coil is de-en er gized, spr in g
pr essu r e r et u r n s t h e m ova ble con t a ct poin t ba ck
a ga in st t h e fixed n or m a lly closed con t a ct poin t . A
r esist or or diode is con n ect ed in pa r a llel wit h t h e
r ela y coil in t h e r ela y, a n d h elps t o dissipa t e volt a ge
spikes a n d elect r om a gn et ic in t er fer en ce t h a t ca n be
gen er a t ed a s t h e elect r om a gn et ic field of t h e r ela y
coil colla pses.
Th e wiper r ela y t er m in a ls a r e con n ect ed t o t h e
veh icle elect r ica l syst em t h r ou gh a con n ect or r ecept a -
cle in t h e fu se block. Th e in pu t s a n d ou t pu t s of t h e
wiper r ela y in clu de:
• Th e com m on feed t er m in a l (30) pr ovides a n ou t -
pu t t o t h e wiper m ot or low speed br u sh t h r ou gh t h e
wiper con t r ol cir cu it r y of t h e m u lt i-fu n ct ion swit ch on
t h e st eer in g colu m n . Wh en t h e wiper r ela y is de-en -
er gized, t h e com m on feed t er m in a l is con n ect ed t o
t h e in pu t of t h e r ela y n or m a lly closed t er m in a l (87).
Wh en t h e wiper r ela y is en er gized, t h e com m on feed
t er m in a l is con n ect ed t o t h e in pu t of t h e r ela y n or-
m a lly open t er m in a l (87A).
• Th e coil gr ou n d t er m in a l (85) is con n ect ed t o
ba t t er y cu r r en t t h r ou gh a fu sed ign it ion swit ch ou t -
pu t cir cu it wh en ever t h e ign it ion swit ch is in t h e On
posit ion .
• Th e coil ba t t er y t er m in a l (86) is con n ect ed t o t h e
r ela y con t r ol ou t pu t of t h e wiper, t u r n sign a ls a n d
en gin e st a r t con t r ol m odu le wit h in t h e fu se block
t h r ou gh t h e wiper r ela y con t r ol cir cu it . Th is elec-
t r on ic cir cu it r y con t r ols t h e gr ou n d pa t h for t h is cir-
cu it in t er n a lly t o en er gize or de-en er gize t h e wiper
r ela y con t r ol coil ba sed u pon it s pr ogr a m m in g a n d
in pu t s fr om t h e wiper a n d wa sh er con t r ol cir cu it r y of
t h e m u lt i-fu n ct ion swit ch , t h e wiper m ot or pa r k
swit ch , a n d t h e ign it ion swit ch .
• Th e n or m a lly open t er m in a l (87) is con n ect ed t o
t h e ou t pu t of t h e wiper m ot or pa r k swit ch t h r ou gh
t h e wiper m ot or pa r k swit ch sen se cir cu it . Th is cir-
cu it ca n ca r r y eit h er ba t t er y cu r r en t (wiper s a r e n ot
in pa r k posit ion ) or gr ou n d (wiper s a r e in pa r k posi-
t ion ), depen din g u pon t h e st a t u s of t h e wiper pa r k
swit ch .
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