Page 1094 of 1395
Component Location
lndex (cont'dl
SRS components are located in this area. Review the SRS component locations, precautions, and procedures in the SRS
section (24) before performing repairs or service.
BLOWER UNITReplacement, page 22-46Ovethaul, page 22 47
/alowen ruoronl
\Test, page 22-16 /
EVAPORATORFeplacement, page 22-48Overhaul, page 22,49
RECIRCULATIONCONTROL MOTORReplacement, page 22 42
HEATER UNITReplacement, page 22 50Overhaul, page 22 52
lest, pag.e 22 42
A/C FILIERReplacement. page 22-50VALVE CABLEAdjustment, page 22-53
RECIRCULATIONCONTROL SWITCH
a/c swtTcH
MODEMOTOR
REAR WINDOWDEFOGGERSwlTCHSee section 23Replacement, page 22-41Test, page 22-41MODE CONTROLDIAL
HEATER CONTROLPANELReplacement, page 22 46
swtTcH
22-4
CONTROL
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Page 1096 of 1395
Component Location
Index (cont'dl
SRS components are located in this area. Review the SRS component locations, precautions, and procedures in the SRS
section (24) before performing repairs or service.
BECIRCULATION CONTROL MOTOR4P CONNECTOR
EVAPORATOR TEMPERATURE SENSORTesl, page 22-44POWER TRANSISTOR3P CONNECTOR
AIR MIX CONTROL MOTORReplacement, page 22-43lest, page 22-13
BLOWER MOTOB2P CONNECTOR
BLOWER MOTOR HIGH RELAYTest, page 22-45
HEATER SUB.HARNESS
7P CONNECTOR
DASHBOARD WIRE HARNESS
HEATER CONTROL PANEL8P AND 2OP CONNECYORS
22-6
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Page 1097 of 1395
Description
The air conditioner system removes heat from the passenger compartment by circulating refrigerant through the systemas shown below.
High'temperature/ High-temperature/
high-pressure gas h igh-pressure liquid
Suction and compression Radiation of heat
High-temperature/
high-pressu re liq uidr raps oeons,
and removes
motsture
More liquidified
row-pressure vapor
EVAPoRAToR (-l EXPANSToN vAL
SUCTION LINEtLow-PRESSURE S|OEt
LIOUID LINE
CONDENSER
coMpREssoR Il- coruoerusenl* necetve
Less moisturized
low-pressure vapor
Absorption of heat
DISCHARGE LINEIHIGH.PRESSURE SIDEI
This vehicle uses HFC-I34a (R-l34a) refrigerant which does not contain chlorofluorocarbons. Pay attention to the follow-ing service items:
. Do not mix refrigerants CFC-12 (R-12) and HFC-l34a (R-134a). They are not compatible.. Use only the recommended polyalkyleneglycol (PAG) refrigerant oil (SP-10) designed for the R-134a compressor.Intermixing the recommended (PAG) refrigerant oil with any other refrigerant oil will result in compressor failure.. Afl Ay'C system parts (compressor, discharge line. suction line, evaporator, condenser. receiver/dryer, expansion valve,O-rings for joints) have to be proper for refrigerant R-134a. Do not confuse with R-12 parts.
. Use a halogen gas leak detector designed for refrigerant R-134a.. R-12 and R-134a refrigerant servicing equipment are not interchangeable. Use only a recovery/recycling/charging stationthat is U.L.iisted and is certified to meet the requirements of SAE J2210 to service R-134a air conditioning system.. Always recover the refrigerant R-134a with an approved recovery/recycling/charging station before disconnecting anylVC fitting.
EVAPORAYOR
22-7
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Page 1099 of 1395
cnNj@_snN
GRY
PNK/BLK
NED/8LU
REO/YEL
YEL/BLU
8RN/WHT
GRNI/VHT
GRN/RED
POWERTRANSISTOR
c401c402
22-9
4
ORNMHT
Fg"{
EVAPONATORTEMPERATURE SENSOR
fi3'.Hfi|$l#i9D>
"'"-
DASH LTGHTS _/4EE|GHTNESS < l_ REDCONTROLLER -!
REAR
fllf$!S,* (l aLurrLRELAY
O:8P coNNEcToR
n :20P c0NN€CToR
YEL/RED
GRN/YEL
8LU/8LK
BRN
YEL
s5v s coM
AMD P AIR MIXCONTROLMOTOB
HOT
VENT
B/LI/lODEH CONT8OLl
10T0RH/D MDEF
HEATER CONTROL PANEI-
8LK
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Page 1101 of 1395
Self-diagnosis Function
The heater control panel has a self-diagnosis function.
Running the Self-diagnosis Function'97 mod€l:
Turn the ignition switch ON {ll), then set the mode control dial to the Vent position, and the recirculation controt switch toRecirculate {recirculation indicator light comes on). Press and hold the recirculation control switch to Fresh (recirculation indi-cator light goes off). Continue to hold the switch; the recirculation indicator light will come on for two seconds. then it willblink the Diagnostic Trouble Code (DTC) to indicate a iaulty component. lf no DTC'S are found, the indicator liqht will notblink atter the initial two second light.
'98 - 00 models:
Set the mode control dial to the Vent position, and turn the ignition switch ON (ll). Within six seconds after turning the igni-tion switch on, press the recirculation control switch the required number of times depending on the recirculation indicatorlight status:
.lftheindicatorlightisON,presstherecirculationcontrol switch five times..lftheindicatorlightisOFF,presstherecirculationcontrol switch six I|mes.The recirculation indicator light will come on for two seconds, then blink the Diagnostic Trouble Code (DTC) to indicate afaulty component. lf no DTC'S are found, the indicator light will not blink after the initial two second liqht.
DTC Indicaiion Pattern {See DTC 3}:
Rocirculationindicatorlight on
Recirculrtionindicatorlighi off'97 model:P.ess and hold th6 recircul.tioncontrol switch'98 - 00 modek:Within six second3 atter theignition switch b turned ON (lll.Prass the rocirculation controlswitch the required number oltimes depending on the r6circu-lation indicator light striu3
,r*
/1.5 aaa 0.3 aac
RECIRCULANONINDICATOR LIGHT
In case of multiple problems, the recirculation indicator light indicate only one DTC that is the least number of blinks.
Resetiing the Solf.diagnosis Funqtion
Turning the ignition switch OFF will cancel the self-diagnosis function. After service work, run the self-diaqnosis functiononce again to check that there is no other Droblem.
MODE CONTROL OIAL
Diagnostic
trouble
code {DTCI
R6circulation
indicator lightComponent with problsmPossiblo causcSee page
'lOne blinkAir mix control molorOpen or short circuit, obstructed door,
faulty motor22-12
2Two blinksElower motorOpen or short circuit, faultv motor22-14,16
Three blinksEvaporator temperature sensorOpon or short circuit, faulty sensor22-20
t
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Page 1102 of 1395
Troubleshooting
Air Mix Control Motor
Recirculation indicator light indicates Diagnostic Trouble Code (DTC) 1: A problem in the air mix control motor circuit.
The air mix control motor regulates the mixture of cool/hot air according to outputs from the heater control panel.
Selt-diagnosis circuit check indi-cates a Droblem in the air mixcontrol motor circuil.
Chock the air mix control moior:1. Disconnect the air mix controlmotor 5P connector,2, Test the air mix control motor(see page 22-43).
Check the air mix control linkagoand doors:1. Remove the air mix controlmotor (see page 22'43).2. Check the air mix control linkage and doors for smooth
ls the air mix control motor OK?
Do the air mix control linkage anddoors move smoothly?
Reolacelhe air mix conlrol motor.
Check Ior a short in the wires:1- Remove the heater controlpanel (see page 22-46).2. Check tor continuity betweenbody ground and the heatercontrol panel 20P connectorterminals No. 1, 6, 9, 17 and18 individually.
Ropair any short in the wire(s)betwoon th. heater co.rtrol panel
and the air mix conlrol motor.
HEATER CONTROL PANEL 2OP CONNECTOR
PNK/BLK
RED/BLU
Wire side of female terminals
To page 22-13
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Page 1103 of 1395
Ftom page 22.12HEATER CONTROL PANEL 2OP CONNECTOR
Wire side ol female terminals
Check tor a short to poweriCheck the same terminals forvoltage.
Repair shon lo power in the wi.ebetween the heater control paneland the air mix control motor,(This damages the heater controlDanel.l
Check tor an open in the wires:Check for continuity between fol-lowing terminals of the heatercontrol panel 20P connector andthe air mix control motor 5P con-nector,zOPi 5P:No. 1 - No.3No.6 _ No. 4No.g _ No.2No. 17 _ No.5No. 18 _ No. 1
Repair any open in the wire{s)betweon the heater control panel
and air mix control motor.
Check toa loos€ wir63 or poorconnections rl the heater controlpanel 20P connector and st theair mix control motor 5P connsc-tor. lJ the connections aro good,substitute a known-good hoatercontrol panel, and rechock. I thesymptom/indication goes away,..pl.ce the original heater con-trol panel.
REO/8LURED/YEL
RED/YEL
AIR MIX CONTROL MOTOR5P CONNECTORWire side of female terminals
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Page 1104 of 1395
Troubleshooting
Blower Motor Speed
Recirculation indicator light indicates Diagnostic Trouble Code (DTC) 2: A problem in the blower motor circuit
The speed of the blower motor is controlled by signals sent from the heater control panel
POWER TRANSISTOR 3P CONNECTOR
1
2)3
f
BLK
Wire side of female terminals
JUMPERWIRE
HEATER CONIROL PANEL 2OP CONNECTORWire side oI fgmale t€rminals
12,/1,/68I10
't112131ia't51611181920
LI GRN/BLK
o
LT GBN/BLK
Blower motol only runs on highspood position; h does not run inany othe. speod positions.
Self-diagnosis circuit check indi-cates a problem in the blowermotor circuit,
Chack lor.n open in the wire:1. Disconnect the power transis-tor 3P connector.2. Check for continuity betweenthe No.3 terminal and bodygro(1nd.
Chock for.n op.n in thc wirobotween ihe powa. transistorrnd body ground, It tho wir. is
OK, check for poor ground atG,O1 .nd G4o2.
ls there continuity?
Chsck for an opon in the wire:'1. Connect the No. 1 and No. 3t€rminals of the power tran-sistor 3P connector with ajumper ware.2. Turn the ignition switch ON {ll).
Repair op6n in the wiro betwoontho Dower transi3tol and theblowor motor.
Check tor an open in tho wire:1. Turn the ignition switch OFF.2. Disconnect the iumper wire.3. Remove the heater controlpanel (see page 22-46).4. Check for continuity botweenthe No. 20 terminal of theheater control panel 20P con-nector and the No.2 terminalof the power transistor 3Pconnectof,
R€pair opon in tho wire betwoenth6 oowor ttan3i3tor and th6hoatar control oanel.
NOTE: lf the blower motor doesrun at all, refer to page 22-16.
10 page 22-15
22-14
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