OPERATION
The wiper mot or oper ation is cont rolled by th e
vehicle operator throu gh bat tery current in pu ts
received by the wiper motor from th e wiper swit ch
circuitry of the m ult i-function swit ch on the top of
the st eering column, and from the wiper relay on the
fuse block under neat h the steerin g column. Th e
wiper mot or speed is controlled by curren t flow to
eith er the low speed or the high speed set of bru shes.
The a utoma tic reset ting circuit brea ker protects the
motor from overloads.
The pa rk switch consist s of a contact disc and
three contacts. The contact disc is mecha nically fa s-
tened to a nd rot ated with a gear in the wiper m otor
transmission . Two in pu t contacts alter nately close
the wiper par k switch sen se output circu it con tact to
ground or t o battery curr ent, depending upon the
position of t he wiper s on the glass. This fea ture
allows t he inter mit tent wipe logic circuit t o m onit or
the position and the cycles of th e wiper motor to pr o-
vide th e inter mit tent wipe and wipe-after-wa sh
modes, as well as allowing the m otor to com plete its
curren t wipe cycle aft er t he wiper system h as been
turned Off an d par k the wiper bla des in the lowest
por tion of t he wipe patt ern.
The wiper motor m ay be diagnosed usin g con ven-
tional diagn ost ic tools and m ethods.
REMOVAL
(1) Disconn ect and isolate the battery nega tive
cable.
(2) Disconn ect the vehicle wire harness connect or
for the wiper m otor from t he motor pigt ail wire con -
nector (F ig. 32).
8R - 32 WIPERS/WASHERS VA
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