Jeep Cherokee 1999, Electronic Service Manual

Page: 501 / 1948

select or swit ch is m oved r igh t (r igh t m ir r or con t r ol),
left (left m ir r or con t r ol), or cen t er t o t u r n t h e power
m ir r or s off. Th en on e of fou r dir ect ion a l con t r ol bu t -
t on s is depr essed t o con t r ol m ovem en t of t h e select ed
m ir r or u p, down , r igh t , or left . Th e dir ect ion a l con t r ol
bu t t on s of t h e DDM-m ou n t ed swit ch a r e illu m in a t ed
wh en t h e ign it ion swit ch is in t h e On or Accessor y
posit ion s. Th e st a n d-a lon e swit ch is n ot illu m in a t ed.
Th e st a n d-a lon e power m ir r or swit ch ca n n ot be
r epa ir ed a n d, if fa u lt y or da m a ged, it m u st be
r epla ced a s a com plet e u n it . If t h e DDM power m ir-
r or swit ch is fa u lt y or da m a ged, t h e en t ir e DDM u n it
m u st be r epla ced.
DOOR MODULE
A Dr iver Door Modu le (DDM) a n d a P a ssen ger
Door Modu le (P DM) a r e u sed on a ll m odels equ ipped
wit h power locks a n d power win dows. E a ch door
m odu le h ou ses bot h t h e fr on t door power lock a n d
power win dow swit ch es. In a ddit ion t o t h e swit ch es
for it s own door, t h e DDM h ou ses in dividu a l swit ch es
for ea ch pa ssen ger door power win dow, a power win -
dow lockou t swit ch , t h e power m ir r or swit ch , a n d cir-
cu it r y t o su ppor t t h e on e-t ou ch down fea t u r e of t h e
dr iver side fr on t door power win dow. Th e P DM a lso
h ou ses t h e con t r ol cir cu it r y a n d t h e power lock a n d
u n lock r ela ys for t h e power lock syst em .
Th e DDM a n d t h e P DM a r e m ou n t ed t o t h eir
r espect ive fr on t door t r im pa n els. Th e DDM a n d
P DM
a r e ser viced in dividu a lly a n d ca n n ot be
r epa ir ed. If t h e DDM or P DM, or a n y of t h e swit ch es
a n d cir cu it r y t h a t t h ey con t a in a r e fa u lt y or da m -
a ged, t h e com plet e DDM or P DM u n it m u st be
r epla ced.
DI AGN OSI S AN D T EST I N G
POWER MIRROR SYSTEM
F or cir cu it descr ipt ion s a n d dia gr a m s, r efer t o
8W-62 - P ower Mir r or s in Gr ou p 8W - Wir in g Dia -
gr a m s.
(1) Ch eck t h e fu se in t h e ju n ct ion block. If OK, go
t o St ep 2. If n ot OK, r epa ir t h e sh or t ed cir cu it or
com pon en t a s r equ ir ed a n d r epla ce t h e fa u lt y fu se.
(2) Tu r n t h e ign it ion swit ch t o t h e On posit ion .
Ch eck for ba t t er y volt a ge a t t h e fu se in t h e ju n ct ion
block. If OK, go t o St ep 3. If n ot OK, r epa ir t h e open
cir cu it t o t h e ign it ion swit ch a s r equ ir ed.
(3) If t h e pr oblem bein g dia gn osed is in oper a t ive
illu m in a t ion of t h e power m ir r or swit ch dir ect ion a l
bu t t on s for t h e Dr iver Door Modu le (DDM)-t ype
swit ch , pr oceed a s follows. If n ot , go t o St ep 5. Ch eck
t h e power win dow cir cu it br ea ker in t h e ju n ct ion
block. If OK, go t o St ep 4. If n ot OK, r epla ce t h e
fa u lt y cir cu it br ea ker.
(4) Tu r n t h e ign it ion swit ch t o t h e Off posit ion .
Discon n ect a n d isola t e t h e ba t t er y n ega t ive ca ble.
Rem ove t h e dr iver side fr on t door t r im pa n el a n d
u n plu g t h e DDM wir e h a r n ess con n ect or s. Con n ect
t h e ba t t er y n ega t ive ca ble. Tu r n t h e ign it ion swit ch
t o t h e On posit ion . Ch eck for ba t t er y volt a ge a t t h e
fu sed ign it ion swit ch ou t pu t cir cu it ca vit y of t h e
12-wa y DDM wir e h a r n ess con n ect or. If OK, r epla ce
t h e fa u lt y DDM. If n ot OK, r epa ir t h e open cir cu it t o
t h e power win dow cir cu it br ea ker in t h e ju n ct ion
block a s r equ ir ed.
(5) If t h e pr oblem bein g dia gn osed is a n in oper a -
t ive power m ir r or elect r ic h ea t in g gr id, pr oceed a s
follows. If n ot , go t o St ep 8. Discon n ect a n d isola t e
t h e ba t t er y n ega t ive ca ble. Rem ove t h e fr on t door
t r im pa n el on t h e side of t h e veh icle wit h t h e in oper-
a t ive m ir r or h ea t in g gr id. Un plu g t h e wir e h a r n ess
con n ect or a t t h e m ir r or. Ch eck for con t in u it y bet ween
t h e gr ou n d cir cu it ca vit y in t h e body h a lf of t h e
power m ir r or wir e h a r n ess con n ect or a n d a good
gr ou n d. If OK, go t o St ep 6. If n ot OK, r epa ir t h e
open cir cu it t o gr ou n d a s r equ ir ed.
(6) Con n ect t h e ba t t er y n ega t ive ca ble. Tu r n t h e
ign it ion swit ch t o t h e On posit ion . Tu r n on t h e r ea r
win dow defogger syst em . Ch eck for ba t t er y volt a ge a t
t h e r ea r win dow defogger r ela y ou t pu t cir cu it ca vit y
in t h e body h a lf of t h e power m ir r or wir e h a r n ess
con n ect or. If OK, go t o St ep 7. If n ot OK, r epa ir t h e
open cir cu it t o t h e r ea r win dow defogger r ela y a s
r equ ir ed.
(7) Ch eck for con t in u it y bet ween t h e gr ou n d cir-
cu it a n d t h e r ea r win dow defogger r ela y ou t pu t cir-
cu it ca vit ies in t h e m ir r or h a lf of t h e power m ir r or
wir e h a r n ess con n ect or. Th er e sh ou ld be con t in u it y. If
n ot OK, r epla ce t h e fa u lt y power m ir r or. If OK, ch eck
t h e r esist a n ce t h r ou gh t h e elect r ic h ea t in g gr id cir-
cu it . Cor r ect r esist a n ce t h r ou gh t h e elect r ic h ea t in g
gr id sh ou ld be fr om 10 t o 16 oh m s wh en m ea su r ed a t
a n a m bien t t em per a t u r e of 21° C (70° F ). If n ot OK,
r epla ce t h e fa u lt y power m ir r or.
(8) Discon n ect a n d isola t e t h e ba t t er y n ega t ive
ca ble. Rem ove t h e st a n d-a lon e power m ir r or swit ch
fr om t h e dr iver side fr on t door t r im pa n el or, wit h a
DDM-m ou n t ed swit ch , r em ove t h e dr iver side fr on t
door t r im pa n el. Un plu g t h e wir e h a r n ess con n ect or
fr om t h e st a n d-a lon e swit ch or t h e 8-wa y wir e h a r-
n ess con n ect or fr om t h e DDM. Con n ect t h e ba t t er y
n ega t ive ca ble. Tu r n t h e ign it ion swit ch t o t h e On
posit ion . Ch eck for ba t t er y volt a ge a t t h e fu sed ign i-
t ion swit ch ou t pu t cir cu it ca vit y of t h e st a n d-a lon e
swit ch wir e h a r n ess con n ect or or t h e 8-wa y DDM
wir e h a r n ess con n ect or. If OK, go t o St ep 9. If n ot
OK, r epa ir t h e open cir cu it t o t h e ju n ct ion block a s
r equ ir ed.
(9) Tu r n t h e ign it ion swit ch t o t h e Off posit ion .
Discon n ect a n d isola t e t h e ba t t er y n ega t ive ca ble.
8T - 2 POWER MIRROR SYSTEMS X J
DESCRI PT I ON AN D OPERAT I ON (Cont inue d)