Remote Keyless Entry System; Description And Opera Tion; Door Module; Power Lock Motor - Jeep Cherokee 1999 Electronic Service Manual

8P - 2 POWER LOCK SYSTEMS
GEN ERAL I N FORM AT I ON (Cont inue d)

REMOTE KEYLESS ENTRY SYSTEM

Th e Rem ot e Keyless E n t r y (RKE ) syst em is a r a dio
fr equ en cy syst em t h a t a llows t h e u se of a r em ot e ba t -
t er y-power ed r a dio t r a n sm it t er t o con t r ol t h e power
lock syst em . On veh icles wit h t h e RKE opt ion , t h e
power locks ca n be oper a t ed by depr essin g t h e Lock
or Un lock bu t t on s of t h e RKE t r a n sm it t er. Th e RKE
syst em in clu des a n illu m in a t ed en t r y fea t u r e, wh ich
t u r n s on t h e cou r t esy la m ps for a t im ed in t er va l
(a bou t t h ir t y secon ds), wh en t h e power locks a r e
u n locked u sin g t h e RKE t r a n sm it t er.
Th e RKE syst em for t h is veh icle a lso fea t u r es a
cu st om er pr ogr a m m a ble h or n ch ir p fea t u r e. Th is fea -
t u r e a llows t h e cu st om er t h e opt ion of en a blin g or
disa blin g t h e h or n ch ir p r equ est t h a t t h e RKE
r eceiver issu es a s a n a u dible in dica t ion t h a t a va lid
Lock sign a l h a s been r eceived fr om t h e RKE t r a n s-
m it t er. See Rem ot e Keyless E n t r y Receiver P r ogr a m -
m in g in t h is gr ou p for m or e in for m a t ion on t h is
fea t u r e.
Th e RKE syst em ca n r et a in t h e veh icle a ccess
codes of u p t o fou r t r a n sm it t er s. Th e t r a n sm it t er
codes a r e r et a in ed in m em or y, even if t h e ba t t er y is
discon n ect ed. If a t r a n sm it t er is fa u lt y or lost , n ew
t r a n sm it t er veh icle a ccess codes ca n be pr ogr a m m ed
in t o t h e syst em u sin g a DRB sca n t ool a n d t h e
pr oper Dia gn ost ic P r ocedu r es m a n u a l.
Th e RKE syst em con sist s of t h e r em ot e key fob
t r a n sm it t er a n d a r a dio r eceiver wit h pr ogr a m logic.
Th e RKE r eceiver is in st a lled in a n RKE h ou sin g on
t h e h ea dlin er of t h e veh icle, or in t h e h ou sin g of t h e
opt ion a l over h ea d con sole, depen din g u pon h ow t h e
veh icle is equ ipped.
F ollowin g a r e gen er a l descr ipt ion s of t h e m a jor
com pon en t s in t h e RKE syst em . Refer t o t h e own er 's
m a n u a l in t h e veh icle glove box for m or e in for m a t ion
on t h e fea t u r es, u se a n d oper a t ion of t h e RKE sys-
t em .
DESCRI PT I ON AN D OPERAT I ON

POWER LOCK SWITCH

Th e power locks a r e con t r olled by a t wo-wa y swit ch
t h a t is in t egr a l t o t h e Dr iver Door Modu le (DDM)
a n d t h e P a ssen ger Door Modu le (P DM) m ou n t ed in
t h e t r im pa n el of it s r espect ive fr on t door. E a ch
swit ch is illu m in a t ed by a ligh t -em it t in g diode wh en
t h e ign it ion swit ch is t u r n ed t o t h e On posit ion . Th e
power lock swit ch es pr ovide a h a r d-wir ed lock or
u n lock sign a l t o t h e power lock syst em con t r ol cir-
cu it r y, wh ich is loca t ed in t h e P DM.
Th e power lock swit ch es a n d t h eir la m ps ca n n ot be
r epa ir ed. If t h e swit ch es a r e da m a ged or fa u lt y, t h e
en t ir e P DM or 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 a n d t h e power m ir r or swit ch . Th e
P DM con t a in s 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 en t ir e power lock sys-
t em .
In it s r ole a s t h e power lock con t r ol m odu le, t h e
P DM r eceives in pu t s fr om t h e ba t t er y, t h e ign it ion
swit ch , t h e DDM, t h e dr iver door a ja r swit ch , t h e
key-in ign it ion swit ch , a n d t h e h ea dla m p swit ch . It
a lso r eceives a h a r d-wir ed in pu t fr om t h e r em ot e
Keyless E n t r y (RKE ) r eceiver, if t h e veh icle is so
equ ipped. In r espon se t o t h ese in pu t s, t h e P DM
sen ds t h e pr oper ou t pu t s t o con t r ol t h e power lock
m ot or s t h r ou gh it s in t egr a l power lock a n d u n lock
r ela ys.
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
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.

POWER LOCK MOTOR

In t h e power lock a n d Rem ot e Keyless E n t r y
(RKE ) syst em s, t h e locks a r e a ct u a t ed by a r ever sible
elect r ic m ot or m ou n t ed wit h in ea ch door a n d t h e lift -
ga t e. Th e power lock m ot or dir ect ion is con t r olled by
t h e ba t t er y a n d gr ou n d feeds fr om t h e power lock
a n d u n lock r ela ys in t egr a l t o t h e P a ssen ger Door
Modu le (P DM).
Th e power lock m ot or s ca n n ot be r epa ir ed a n d, if
fa u lt y or da m a ged, t h e en t ir e m ot or
r epla ced.
REMOTE KEYLESS ENTRY TRANSMITTER
Th e Rem ot e Keyless E n t r y (RKE ) syst em t r a n sm it -
t er is equ ipped wit h t wo bu t t on s, la beled Lock a n d
Un lock. It is a lso equ ipped wit h a key r in g a n d is
design ed t o ser ve a s a key fob. Th e oper a t in g r a n ge
of t h e t r a n sm it t er r a dio sign a l is u p t o 7 m et er s (23
feet ) fr om t h e RKE r eceiver.
E a ch t r a n sm it t er h a s a differ en t veh icle a ccess
code, wh ich m u st be pr ogr a m m ed in t o t h e m em or y of
t h e RKE r eceiver in t h e veh icle in or der t o oper a t e
t h e RKE syst em . See Rem ot e Keyless E n t r y Tr a n s-
m it t er P r ogr a m m in g in t h is gr ou p for m or e in for m a -
t ion .
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