Jeep Cherokee 1999, Electronic Service Manual

Page: 507 / 1948

pr oper Dia gn ost ic P r ocedu r es m a n u a l a r e r ecom -
m en ded.
Refer t o Gr ou p 8E - In st r u m en t P a n el Syst em s for
t h e in st r u m en t clu st er ser vice pr ocedu r es. Th e
in st r u m en t clu st er ch im e wa r n in g cir cu it r y a n d
ch im e t on e gen er a t or 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 in st r u m en t clu st er a ssem bly
m u st be r epla ced.
DRIVER DOOR JAMB SWITCH
Th e dr iver door ja m b swit ch is m ou n t ed t o t h e
dr iver side fr on t door h in ge pilla r. Th e swit ch closes
a pa t h t o gr ou n d for t h e in st r u m en t clu st er ch im e
wa r n in g cir cu it r y t h r ou gh t h e key-in ign it ion swit ch
a n d/or t h e h ea dla m p swit ch wh en t h e dr iver door is
open ed, a n d open s t h e gr ou n d pa t h wh en t h e dr iver
door is closed.
Th e dr iver door ja m b 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. Refer
t o Gr ou p 8L - La m ps for t h e ser vice pr ocedu r es.
DRIVER SEAT BELT SWITCH
Th e dr iver sea t belt swit ch is in t egr a l t o t h e dr iver
sea t belt bu ckle-h a lf a ssem bly. Th e swit ch is n or-
m a lly closed, pr ovidin g a gr ou n d pa t h t o t h e in st r u -
m en t pa n el ch im e wa r n in g cir cu it r y. Wh en t h e t ip-
h a lf of t h e sea t belt is in ser t ed in t o t h e sea t belt
bu ckle, t h e swit ch open s t h e gr ou n d pa t h .
Th e dr iver sea t belt swit ch 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 dr iver sea t belt bu ck-
le-h a lf u n it m u st be r epla ced. Refer t o Gr ou p 23 -
Body for t h e ser vice pr ocedu r es.
KEY-IN IGNITION SWITCH
Th e key-in ign it ion swit ch is in t egr a l t o t h e ign i-
t ion swit ch , wh ich is m ou n t ed on t h e left side of t h e
st eer in g colu m n , opposit e t h e ign it ion lock cylin der.
It closes a pa t h t o gr ou n d for t h e in st r u m en t clu st er
ch im e wa r n in g cir cu it r y wh en t h e ign it ion key is
in ser t ed in t h e ign it ion lock cylin der a n d t h e dr iver
door ja m b swit ch is closed (dr iver door is open ). Th e
key-in ign it ion swit ch open s t h e gr ou n d pa t h wh en
t h e key is r em oved fr om t h e ign it ion lock cylin der.
Th e key-in ign it ion swit ch 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 ign it ion swit ch m u st
be r epla ced. Refer t o Gr ou p 8D - Ign it ion Syst em s for
t h e ser vice pr ocedu r es.
HEADLAMP SWITCH
Th e h ea dla m p swit ch is loca t ed in t h e in st r u m en t
pa n el, ou t boa r d of t h e st eer in g colu m n . It closes a
pa t h t o gr ou n d for t h e in st r u m en t clu st er ch im e
wa r n in g cir cu it r y wh en t h e pa r k or h ea d la m ps a r e
on a n d t h e dr iver door ja m b swit ch is closed (dr iver
door is open ). Th e h ea dla m p swit ch open s t h e gr ou n d
pa t h wh en t h e h ea dla m p swit ch is t u r n ed off.
Th e h ea dla m p 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. Refer t o
Gr ou p 8E - In st r u m en t P a n el Syst em s for t h e ser vice
pr ocedu r es.
DI AGN OSI S AN D T EST I N G
DRIVER DOOR JAMB SWITCH
F or cir cu it descr ipt ion s a n d dia gr a m s, r efer t o
8W-40 - In st r u m en t Clu st er or 8W-44 - In t er ior
Ligh t in g in Gr ou p 8W - Wir in g Dia gr a m s.
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS,
REFER TO GROUP 8M - PASSIVE
RESTRAINT SYSTEMS BEFORE ATTEMPTING ANY
STEERING
WHEEL, STEERING COLUMN, OR
INSTRUMENT PANEL COMPONENT DIAGNOSIS OR
SERVICE. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
BAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.
(1) Rot a t e t h e h ea dla m p swit ch kn ob cou n t er clock-
wise t o en su r e t h a t t h e dom e la m ps a r e n ot swit ch ed
off. Open t h e dr iver door a n d n ot e wh et h er t h e in t e-
r ior la m ps ligh t . Th ey sh ou ld ligh t . If OK, see t h e
dia gn osis for t h e Key-In Ign it ion Swit ch or t h e H ea d-
la m p Swit ch in t h is gr ou p. If n ot OK, go t o St ep 2.
(2) Discon n ect a n d isola t e t h e ba t t er y n ega t ive
ca ble. Un plu g t h e dr iver door ja m b swit ch fr om it s
wir e h a r n ess con n ect 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 of t h e dr iver door ja m b
swit ch wir e h a r n ess con n ect or a n d a good gr ou n d.
Th er e sh ou ld be con t in u it y. If OK, go t o St ep 3. If n ot
OK, r epa ir t h e cir cu it t o gr ou n d a s r equ ir ed.
(3) Ch eck for con t in u it y bet ween t h e door ja m b
swit ch gr ou n d cir cu it t er m in a l a n d t h e left fr on t door
ja m b swit ch sen se t er m in a l of t h e door ja m b swit ch .
Th er e sh ou ld be con t in u it y wit h t h e swit ch plu n ger
r elea sed, a n d n o con t in u it y wit h t h e swit ch plu n ger
depr essed. If n ot OK, r epla ce t h e fa u lt y swit ch .
DRIVER SEAT BELT SWITCH
F or cir cu it descr ipt ion s a n d dia gr a m s, r efer t o
8W-40 - In st r u m en t Clu st er or 8W-44 - In t er ior
Ligh t in g in Gr ou p 8W - Wir in g Dia gr a m s.
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS,
REFER TO GROUP 8M - PASSIVE
RESTRAINT SYSTEMS BEFORE ATTEMPTING ANY
STEERING
WHEEL, STEERING COLUMN, OR
INSTRUMENT PANEL COMPONENT DIAGNOSIS OR
SERVICE. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
BAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.
8U - 2 CHIME/BUZZER WARNING SYSTEMS X J
DESCRI PT I ON AN D OPERAT I ON (Cont inue d)