jeep tj 1998 fsm audio systems

8/14/2019 Jeep tj 1998 fsm Audio Systems

1/10


2/10

panel . This addit ional disconnect al lows the instru-men t p an el a s sembl y t o b e remov ed an d in s t a lledwithout removing the radio.

The factory-insta lled Electronically Tun ed Radios(ETRs) aut omatically compensate for radio an tennat r im. Therefore , no an tenna t r immer ad jus tment i s

required or possible when replacing t he receiver ort h e an t en n a .

RADIO NOISE SUPPRESSIONRadio Frequency Int erference (RFI) a nd Electro-

Magnet ic In terference (EMI) noise suppress ion i saccomplished primari ly through circuitry internal tot h e rad io rece ive rs. Th ese in t e rn a l su pp ressiondevices are only serviced as part of the radio receiver.

External suppression devices t hat are serviced, andshould be checked in the case of RFI or EMI noisecomplaints, include th e following:

Radio antenna base ground Radio chassis ground wire, strap, or bracket Engine-to-body ground strap (if the vehicle is so

equipped) Cab-to-bed ground s t rap (i f the veh icle i s so

equipped) Heater core ground s t rap (i f the veh icle i s so

equipped) Resistor-type spark plugs Radio suppression-type secondary ignit ion wir-

ing.In addit ion , i f the source of RFI or EMI noise i s

identified as a component on the vehicle (i.e., gener-a tor, b lower motor, e tc. ), the ground pa th for tha tcomponent should be checked. If excessive resistanceis fou n d in t h at cir cu it , r ep air t h at cir cu it a srequired before considering any component replace-ment .

If the source of the noise is identified as two-waymob il e rad io or t e leph on e equ ip men t , ch eck t h eequipment installation for the following:

Power connect ions should be made d irect ly tot h e b a t t ery, an d fu sed a s closely t o t h e b a t t ery a spossible.

The an tenna should be mounted on the roof o rtoward the rear of the vehicle. Remember that mag-netic antenna mounts on t he r oof panel can adverselyaffect the operation of an overhead console compass,if the vehicle is so equipped.

The antenna cable should be fully shielded coax-ia l cab le , sh ou ld b e a s sh or t a s i s p ract ica l, an dshould be rou ted away from the factory-insta l ledvehicle wire harnesses whenever possible.

Th e a n ten n a a n d ca ble m u st be ca r efu llym a t ch ed t o e ns u re a low S t an d in g Wa ve R at io(SWR).

Fleet vehicles are available with an extra-cost RFI-suppressed Powertrain Control Module (PCM). This

uni t reduces in terference genera ted by th e PCM onsome radio frequencies used in two-way radio com-munications. However, this unit will not resolve com-pla in ts of RFI in the commercia l AM or FM rad iofrequency ranges.

DIAGNOSIS AND TESTING

AUDIO SYSTEM

WARNING: ON VEHICLES EQUIPPED WITH AIR-BAGS, REFER TO GROUP 8M - PASSIVERESTRAINT SYSTEMS BEFORE ATTEMPTING ANYSTEERING WHEEL, STEERING COLUMN, ORINSTRUMENT PANEL COMPONENT DIAGNOSIS ORSERVICE. FAILURE TO TAKE THE PROPER PRE-CAUTIONS COULD RESULT IN ACCIDENTAL AIR-BAG DEPLOYMENT AND POSSIBLE PERSONALINJURY.

8F - 2 AUDIO SYSTEMS TJ

DESCRIPTION AND OPERATION (Continued)


3/10

Audio System DiagnosisCONDITION POSSIBLE CAUSE CORRECTION

NO AUDIO. 1. Fuse faulty.2. Radio connector faulty.3. Wiring faulty.4. Ground faulty.

5. Radio faulty.6. Speakers faulty.

1. Check radio fuses in PowerDistribution Center. Replace fuses, ifrequired.2. Check for loose or corroded radio

connector. Repair, if required.3. Check for battery voltage at radioconnector. Repair wiring, if required.4. Check for continuity between radiochassis and a known good ground.There should be continuity. Repairground, if required.5. Exchange or replace radio, ifrequired.6. See speaker diagnosis, in thisgroup.

NO DISPLAY. 1. Fuse faulty.2. Radio connector faulty.3. Wiring faulty.4. Ground faulty.5. Radio faulty.

1. Check radio fuses in PowerDistribution Center. Replace fuses, ifrequired.2. Check for loose or corroded radioconnector. Repair, if required.3. Check for battery voltage at radioconnector. Repair wiring, if required.4. Check for continuity between radiochassis and a known good ground.There should be continuity. Repairground, if required.5. Exchange or replace radio, ifrequired.

CLOCK WILL NOT KEEP SETTIME.

1. Fuse faulty.2. Radio connector faulty.3. Wiring faulty.4. Ground faulty.5. Radio faulty.

1. Check ignition-off draw fuse.Replace fuse, if required.2. Check for loose or corroded radioconnector. Repair, if required.3. Check for battery voltage at radioconnector. Repair wiring, if required.4. Check for continuity between radio

chassis and a known good ground.There should be continuity. Repairground, if required.5. Exchange or replace radio, ifrequired.

POOR RADIO RECEPTION. 1. Antenna faulty.2. Ground faulty.3. Radio faulty.

1. See antenna diagnosis, in thisgroup. Repair or replace antenna, ifrequired.2. Check for continuity between radiochassis and a known good ground.There should be continuity. Repairground, if required..3. Exchange or replace radio, ifrequired.

NO/POOR TAPE OPERATION. 1. Faulty tape.

2. Foreign objects behind tape door.3. Dirty cassette tape head.4. Faulty tape deck.

1. Insert known good tape and test

operation.2. Remove foreign objects and testoperation.3. Clean head with Mopar CassetteHead Cleaner.4. Exchange or replace radio, ifrequired.

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 testoperation.2. Clean CD and test operation.3. Allow temperature of vehicle interiorto stabilize and test operation.4. Exchange or replace radio, ifrequired.

TJ AUDIO SYSTEMS 8F - 3

DIAGNOSIS AND T ESTING (Continued)


4/10

RADIOFor circu it d escr ip t ion s an d d iagrams , re fe r t o

8W-47 - Audio System in Group 8W - Wiring Dia-grams.

WARNING: ON VEHICLES EQUIPPED WITH AIR-

BAGS, REFER TO GROUP 8M - PASSIVERESTRAINT SYSTEMS BEFORE ATTEMPTING ANYSTEERING WHEEL, STEERING COLUMN, ORINSTRUMENT PANEL COMPONENT DIAGNOSIS ORSERVICE. FAILURE TO TAKE THE PROPER PRE-CAUTIONS COULD RESULT IN ACCIDENTAL AIR-BAG DEPLOYMENT AND POSSIBLE PERSONALINJURY.

CAUTION: The speaker output of the radio is afloating ground system. Do not allow any speakerlead to short to ground, as damage to the radio

may result.(1) Check the fuse(s) in the Power Dis t r ibu t ion

Center (PDC). If OK, go to Step 2. If not OK, repairthe shorted ci rcu i t or component as requi red andreplace the faulty fuse(s).

(2) Check for bat tery voltage at the fuse(s) in thePDC. If OK, go to Step 3. If not OK, repair the openci rcu i t to the ba t te ry an d/or the ign i t ion switch asrequired.

(3) Disconnect and i sola te the ba t te ry negat ivecable. Remove the radio, but do not unplug the radiowire h a rn ess con n ect ors . Ch eck for con t in u it y

between the radio chassis and a good ground. Thereshould be continuity. If OK, go to Step 4. If not OK,r ep a ir t h e op en r a dio ch a ss is gr ou n d cir cu it a srequired.

(4) Connect the ba t te ry negat ive cab le . Turn theignit ion switch to the On posi t ion. Check for bat teryvoltage a t the fused ignition switch out put (accesso-ry/run) circuit cavity of the left (gray) radio wire har-ness connector. If OK, go to Step 5. If not OK, repairthe open circuit as required.

(5) Turn the ign i t ion switch to the Off posit ion .Check for bat tery voltage at the fused B(+) circuitcavity of the left (gray) radio wire harness connector.

If OK, replace the faulty radio. If not OK, repair theopen circuit to the Ignit ion-Off Dra w (IOD) fuse asrequired.

SPEAKERFor circu it d escr ip t ion s an d d iagrams , re fe r t o

8W-47 - Audio System in Group 8W - Wiring Dia-grams.

WARNING: ON VEHICLES EQUIPPED WITH AIR-BAGS, REFER TO GROUP 8M - PASSIVERESTRAINT SYSTEMS BEFORE ATTEMPTING ANY

STEERING WHEEL, STEERING COLUMN, ORINSTRUMENT PANEL COMPONENT DIAGNOSIS ORSERVICE. FAILURE TO TAKE THE PROPER PRE-CAUTIONS COULD RESULT IN ACCIDENTAL AIR-BAG DEPLOYMENT AND POSSIBLE PERSONALINJURY.

CAUTION: The speaker output of the radio is afloating ground system. Do not allow any speakerlead to short to ground, as damage to the radiomay result.

(1) Turn the ign i t ion switch to the On posit ion .Turn the radio on. Adjust the balance and fader con-t rols to check the performance of each ind iv idualspeaker. Note the speaker locat ions that are not per-forming correctly. Go to Step 2.

(2) Turn the radio off. Disconnect and isolate thebattery negative cable. Remove the radio. Un plug thewire harness connectors at the radio. Check both thespeaker feed (+) circuit and return () circuit cavitiesfor the inopera t ive speaker loca t ion(s) a t the rad iowire harness connectors for continuity to ground. Ineach case, there should be no continuity. If OK, go toStep 4 . I f no t OK, go to Step 3 .

(3) L ea ve t h e r a dio w ir e h a r n es s con n ect or sunplugged. Unplug the wire harness connector at theinoperat ive speaker. Check both the speaker feed (+)circuit and return () circuit cavit ies of the speakerwire har ness connector for continuity to ground. Ineach ca se, t h e re sh ou ld b e n o con t in u it y. I f OK,

rep lace the shorted speaker. I f not OK, repa ir theshorted circuit as required.(4) Plug in the speaker wire harness connector.

Check the res is tance between the speaker feed (+)circuit and return () circuit cavities of the radio wireharn ess connectors for the inoperat ive speaker loca-t ion(s). The meter should read between 3 and 8 ohms(speaker resistance). If OK, go to Step 5. If not OK,go to Step 6.

(5) Ins ta l l a known good rad io. Connect the ba t -tery n egative cable. Turn the ignit ion switch t o theOn posi t ion . Turn on the rad io and tes t the speakeroperat ion. If OK, replace the faulty radio. If not OK,

replace the faulty speaker.(6) Turn the radio off. Turn the ignit ion switch to

the Off posit ion. Disconnect and isolate the bat terynegat ive cab le . Remove the tes t rad io. Unplug thespeaker wire harness connector a t the inopera t ivespeaker. Check the res is tance between the speakerfeed (+) circuit cavities of the radio wire harness con-n ect or an d t h e speak er wire h a rn ess con n ect or.Repeat the check between the speaker return () cir-cuit cavit ies of the radio wire harness connector andthe speaker wire harness connector. In each case ,t h e re sh ou ld b e n o measu rab le re sis t an ce . I f OK,




5/10

replace t h e fau lt y speake r. I f n o t OK, repa ir t h espeaker wire harness circuit(s) as required.

ANTENNA


The fol lowing four tests are used to diagnose t hean tenna wi th an ohmmeter :

Te s t 1 - Mast to g round tes t Te s t 2 - Tip-of-mast to tip-of-conductor test Te s t 3

- Body ground to bat tery ground test Te s t 4 - Body ground to coaxial shield test .The ohmmeter test lead connections for each test

are shown in Antenna Tests (Fig. 1).

NOTE: This model has a two-piece antenna coaxialcable. Tests 2 and 4 must be conducted in twosteps to isolate a coaxial cable problem; from thecoaxial cable connection under the right end of theinstrument panel near the right cowl side panel tothe antenna base, and then from the coaxial cableconnection to the radio chassis connection.

T E S T 1

Test 1 determines if the antenna mast is insulatedfrom the base. Proceed as follows:

(1) Unplug the an tenna coaxia l cab le connectorfrom the radio chassis and isolate.

(2) Connect one ohmmeter tes t l ead to the t ip o f

the an tenna mast . Connect the o ther tes t l ead to theantenna base. Check for continuity.(3) There should be no continuity. If continuity is

found , rep lace the fau l ty or damaged an tenna baseand cable assembly.

T E S T 2

Test 2 checks the an tenna for an open c ircu i t asfollows:

(1) Unplug the an tenna coaxia l cab le connectorfrom the radio chassis.

(2 ) Connect one ohmmeter tes t l ead to the t ip o f the an tenna mast . Connect the o ther tes t l ead to the

center pin of the antenna coaxial cable connector.(3) Continuity should exist (the ohmmeter shouldonly register a fract ion of an ohm). High or infiniteres is tance indica tes damage to the base a nd cab lea ssembl y. Rep lace t h e fau lt y b a se an d cab le , i f required.

T E S T 3

Test 3 checks the condit ion of the veh icle bodyground connect ion . This tes t should be performedwith t he bat tery posi t ive cable removed from the bat-te ry. Disconnect both ba t te ry cab les , the negat ivecable first . Reconnect the bat tery negative cable and

perform the test as follows:(1) Connect one ohmmeter test lead to the vehicle

fen de r. Con n ect t h e ot h e r t e st le ad t o t h e b a t t erynegative post.

(2) The resistance should be less than one ohm.(3) I f the res is tance i s more th an one ohm, check

the braided ground str ap connected t o the engine andthe vehicle body for being loose, corroded, or dam-aged. Repair the ground strap connection, if required.

T E S T 4

Test 4 checks the condit ion of the ground betweenthe antenna base and the vehicle body as fol lows:

(1) Connect one ohmmeter test lead to the vehiclefender. Connect th e other t est lead t o the outer crimpon the antenna coaxial cable connector.

(2) The resistance should be less then one ohm.(3) I f the res i s tance i s more then one ohm, c lean

and/or t igh ten the an tenna base to fender mount inghardware .

Fig. 1 Antenna Tests




6/10

RADIO FREQUENCY INTERFERENCE

WARNING: ON VEHICLES EQUIPPED WITH AIR-BAGS, REFER TO GROUP 8M - PASSIVERESTRAINT SYSTEMS BEFORE ATTEMPTING ANYSTEERING WHEEL, STEERING COLUMN, OR

INSTRUMENT PANEL COMPONENT DIAGNOSIS ORSERVICE. FAILURE TO TAKE THE PROPER PRE-CAUTIONS COULD RESULT IN ACCIDENTAL AIR-BAG DEPLOYMENT AND POSSIBLE PERSONALINJURY.

Inspect the ground connections at the following: Blower motor Electric fuel pump Generator Ignition module Wiper motor Antenna coaxial ground

Radio ground Body-to-engine braided ground strap (if the vehi-

cle is so equipped).C le an , t igh t en , or r ep a ir t h e con n ect ion s a s

required.Also inspect th e following secondary ignition sys-

tem components, as described in Group 8D - IgnitionSystems:

Spark plug wire routing and condit ion Distributor cap and rotor Ignition coil Spark plugs.Reroute the spark plug wires or replace the faulty

components as required.

REMOVAL AND IN STALLATI ON

RADIO

WARNING: ON VEHICLES EQUIPPED WITH AIR-BAGS, REFER TO GROUP 8M - PASSIVERESTRAINT SYSTEMS BEFORE ATTEMPTING ANYSTEERING WHEEL, STEERING COLUMN, ORINSTRUMENT PANEL COMPONENT DIAGNOSIS ORSERVICE. FAILURE TO TAKE THE PROPER PRE-

CAUTIONS COULD RESULT IN ACCIDENTAL AIR-BAG DEPLOYMENT AND POSSIBLE PERSONALINJURY.

(1) Disconnect and i sola te the ba t te ry negat ivecable.

(2) Remove the ins t rument panel top cover fromthe instrument panel . Refer to Instrument Panel TopCover in Group 8E - Ins t rument Panel Systems forthe procedures.

(3) Remove the ash receiver from the ash receiverhousing in the lower instrument panel center bezel .

(4 ) Remove t he one screw loca ted in the back of t h e a sh rece iv er h ou s in g t h a t secu re s t h e cen t erbezel to the lower instrument panel (Fig. 2).

(5) Remove the two screws that secure the centerbezel to the top of the instrument panel .

(6 ) Usin g a t r im s t ick or an ot h e r su it ab le wid eflat-bladed tool, gently pry the lower edge of the cen-ter bezel away from the instrument panel .

(7) Lift the lower edge of th e center bezel upward sto re lease the four snap c l ip re ta iners tha t secure i tto the ins t rument panel .

(8) Remove t he center bezel from the vehicle.(9) Remove the two screws tha t secure the rad io

face plate to the instrument panel (Fig. 3).

Fig. 2 Center Bezel Remove/Install

Fig. 3 Radio Remove/Install




7/10

(10) Pul l the rad io ou t f rom the ins t rument panelfar enough to access th e wire h arness connectors andthe antenna coaxial cable connector (Fig. 4).

(11) Unplug the wire harness connectors and theantenna coaxial cable connector from the rear of theradio.

(1 2) Remov e t h e screw t h a t secu re s t h e g rou n dst rap to the rad io chass is .

(13) Remove the radio from the instrument panel .(14) Reverse the removal p rocedures to insta l l.

Tigh ten the rad io mount ing screws to 5 Nm (45 in .lb s. ). Ti gh t en t h e in s t ru men t p an el cen t er b ezelmounting screws to 2.2 Nm (20 in. lbs.).

SPEAKERINSTRUMENT PANEL



(2 ) Remov e t h e t wo screws t h a t secu re t h e ou t -b oa rd en d of t h e sp eak e r b eze l t o t h e in s t ru men tpanel (Fig. 5).

(3 ) Usi n g a t r im s t ick or an ot h e r su it ab le wid efla t -b laded tool , gen t ly pry a t the top and bot tomedges of the speaker bezel to re lease the two snapclip retainers that secure the bezel to the instrumentpanel.

(4) Remove the speaker bezel from the instrumentpanel.

(5) Remove t he foam rubber speaker baffle fromthe speaker.

(6) Rem ove t h e fou r s cr ews t h at s ecu r e t h espeaker to the inst rument panel a rmatur e (Fig . 6 ).

(7 ) Pu ll t h e speak er away from t h e in s t ru men tpanel far enough to access the speaker wire harnessconnector.

(8 ) Unplug the wire harness connector from thespeaker.

(9) R em ove t h e s pea k er fr om t h e in s tr u m en tpanel.

(10) Reverse the removal p rocedures to insta l l.Tighten the speaker mounting screws to 1.1 Nm (10in. lbs.). Tighten the speaker bezel mounting screwsto 2.2 Nm (20 in. lbs.).

Fig. 4 Radio Connections - Typical

Fig. 5 Instrument Panel Speaker Bezel Remove/ Install

Fig. 6 Instrument Panel Speaker Remove/Install


REMOVAL AND INSTALLATION (Continued)


8/10

SOUND BAR


(2) R em ove t h e fou r s cr ews t h at s ecu r e t h espeaker gri l le and speaker to the sound bar.

(3 ) Lower the speaker and gr il le from the sound

bar fa r enough to access the speaker wire harnessconnector.(4 ) Unplug the wire harness connector from the

speaker.(5) Remove the speaker and gri l le from the sound

bar.(6) Remove the speaker gri l le from the speaker.(7 ) Rev erse t h e remov a l p rocedu re s t o in s t a ll.

Tighten the mounting screws to 1.1 Nm (10 in. lbs.).

SOUND BAR(1) Disconnect and i sola te the ba t te ry negat ive

cable.

(2) If the veh icle i s equ ipped with the op t ionalhard top, remove the hard top from the vehicle. Referto Hard Top in Group 23 - Body for the procedures.

(3) I f the veh icle i s equ ipped with the s tandardsoft top, lower the soft top. Refer to Folding Downthe Fabric Top in t he Owner s Manual for the proce-dures.

(4) Release the hook and loop closure on each out-board end flap of the sound bar t rim cover.

(5) Lift the left outboard end flap of the sound bartrim cover over the top of the sport bar far enough toaccess the wire harness connector (Fig. 7).

(6) Unplug the sound bar wire harness connector.(7 ) Li ft each ou tboard end flap of th e sound bar

cove r ov er t h e t op of t h e sp or t b a r fa r en ou g h t oaccess the mounting screws (Fig. 8).

(8) Remove the two screws that secure each end of the sound bar to the sport bar.

(9 ) L ift t h e sou n d b a r u p off o f t h e sp or t b a r t oremove it from the vehicle.

(10) Reverse the removal p rocedures to insta l l.Tigh ten the sound bar mount ing screws to 11 Nm(100 in. lbs.).

ANTENNA



(2 ) Remove t h e g love b ox from t h e in s t ru men tpanel . Refer to Glove Box in Group 8E - InstrumentPanel Systems for the procedures.

(3) Reach through the instrument panel glove boxopening to unplug the antenna coaxial cable connec-tor. Unplug the connector by pu l ling i t apar t whiletwist ing the metal connector halves. Do n ot pull onthe cable.

(4) From inside the passenger compartment, pushthe coaxial cable grommet on the antenna body half of the coaxial cable out through the hole in the rightinner cowl side panel (Fig. 9).

(5 ) Un screw t h e an t en n a mas t from t h e an t en n abody base on the right outer cowl side panel .

(6 ) Usin g a t r im s t ick or an ot h e r su it ab le wid eflat-bladed tool , gently pry the edge of the antennabase t r im cover to unsnap i t f rom the an tenna bodybase.

Fig. 7 Sound Bar Wire Harness Connector Remove/ Install

Fig. 8 Sound Bar Remove/Install




9/10

(7) R em ove t h e t h r ee s cr ew s t h a t s ecu r e t h eantenna body base to the right outer cowl side panel .

(8) F r om t h e ou t sid e of t h e ve hicle , p u ll t h ean tenna body base and cab le assembly ou t th roughthe hole in the right outer cowl side panel .

(9 ) Reve rse t h e remova l p rocedu re s t o i n st a ll.

Tighten the antenna body base mounting screws to 2Nm (17 in . lbs .). Tigh ten the an tenna mast to 3 .3Nm (30 in. lbs.).

Fig. 9 Antenna Remove/Install




10/10

jeep tj 1998 fsm audio systems

Documents