Jeep Cherokee 1999, Electronic Service Manual

Page: 365 / 1948

Audio System Diagnosis
CONDITION POSSIBLE CAUSE CORRECTION
NO COMPACT DISC
OPERATION 1. Faulty CD.
2. Foreign material on
CD.
3. Condensation on CD
or optics.
4. Faulty CD player. 1. Insert known good CD and test operation.
2. Clean CD and test operation.
3. Allow temperature of vehicle interior to stabilize and test
operation.
4. Exchange or replace radio, if required.
RADIO
F or cir cu it descr ipt ion s a n d dia gr a m s, r efer t o
8W-47 - Au dio Syst em 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.
CAUTION: The speaker output of the radio is a
“floating ground” system. Do not allow any speaker
lead to short to ground, as damage to the radio
may result.
(1) Ch eck t h e fu se(s) in t h e ju n ct ion block a n d t h e
P ower Dist r ibu t ion Cen t er (P DC). 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(s).
(2) Ch eck for ba t t er y volt a ge a t t h e fu se in t h e
P DC. 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 ba t t er y a s r equ ir ed.
(3) 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 4. 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.
(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 r a dio, bu t do n ot u n plu g t h e r a dio wir e
h a r n ess con n ect or s. Ch eck for con t in u it y bet ween t h e
r a dio ch a ssis 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 5. If n ot OK, r epa ir t h e
open r a dio ch a ssis gr ou n d cir cu it a s r equ ir ed.
(5) 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 (a ccesso-
r y/r u n ) cir cu it ca vit y of t h e left (gr a y) r a dio wir e h a r-
n ess con n ect or. If OK, go t o St ep 6. If n ot OK, r epa ir
t h e open cir cu it a s r equ ir ed.
(6) Tu r n t h e ign it ion swit ch t o t h e Off posit ion .
Ch eck for ba t t er y volt a ge a t t h e fu sed B(+) cir cu it
ca vit y of t h e left (gr a y) r a dio wir e h a r n ess con n ect or.
If OK, r epla ce t h e fa u lt y r a dio. If n ot OK, r epa ir t h e
open cir cu it t o t h e Ign it ion -Off Dr a w (IOD) fu se a s
r equ ir ed.
SPEAKER
F or cir cu it descr ipt ion s a n d dia gr a m s, r efer t o
8W-47 - Au dio Syst em 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.
CAUTION: The speaker output of the radio is a
“floating ground” system. Do not allow any speaker
lead to short to ground, as damage to the radio
may result.
(1) Tu r n t h e ign it ion swit ch t o t h e On posit ion .
Tu r n t h e r a dio on . Adju st t h e ba la n ce a n d fa der con -
t r ols t o ch eck t h e per for m a n ce of ea ch in dividu a l
spea ker. Not e t h e spea ker loca t ion s t h a t a r e n ot per-
for m in g cor r ect ly. Go t o St ep 2.
(2) Tu r n t h e r a dio off. 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 r a dio fr om t h e in st r u -
m en t pa n el. If t h e veh icle is equ ipped wit h t h e In fin -
it y spea ker pa cka ge, a lso u n plu g t h e wir e h a r n ess
con n ect or s a t t h e a m plifier. Ch eck bot h t h e spea ker
feed (+) cir cu it a n d r et u r n (–) cir cu it ca vit ies for t h e
in oper a t ive spea ker loca t ion (s) a t t h e r a dio wir e h a r-
n ess con n ect or s for con t in u it y t o gr ou n d. In ea ch
ca se, t h er e sh ou ld be n o con t in u it y. If OK, go t o St ep
3. If n ot OK, r epa ir t h e sh or t ed spea ker cir cu it (s) a s
r equ ir ed.
8F - 4 AUDIO SYSTEMS X J
DI AGN OSI S AN D T EST I N G (Cont inue d)