ACURA RL KA9 1996 Service Repair Manual

Climate Contro l Uni t
Face Panel/Butto n Replacemen t
CAUTION:
Before replacin g fac e pane l o r buttons , discharg e th e
stati c electricit y (whic h accumulate d o n yo u whe n
yo u remove d th e climat e contro l unit ) b y touchin g
th e doo r strike r o r othe r bod y parts .
D o no t touc h th e electroni c component s o n th e
printe d circui t boar d in th e climat e contro l unit .
1 . Remov e th e climat e contro l uni t (se e pag e 22-55 ).
2 . Remov e th e temperatur e contro l an d th e fa n contro l
knobs.
TEMPERATUR ECONTROL KNO B
FAN CONTRO LKNOB
3. Carefull y remov e th e self-tappin g screw s an d th e
rea r cover .
REAR COVE R
4. Remov e th e self-tappin g screws , the n remov e th e
cloc k an d th e displa y fro m th e fac e panel .
DISPLA Y
CLOCK
5. I f necessary , remov e th e button s sequentiall y fro m
left t o right .
BUTTO N
6. Instal l i n th e revers e orde r o f removal . Mak e not e o f
the followin g items .
NOTE :
Do no t kin k o r pul l o n th e wire s betwee n th e con -
tro l uni t an d printe d circui t board .
Afte r installation , operat e th e climat e contro l uni t
t o se e whethe r i t work s properly .
Ru n th e self-diagnosi s functio n t o confir m tha t
ther e ar e n o problem s in th e system .
FACE PANE L
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Air Mi x Contro l Moto r
Replacemen tTest
1. Remov e th e glov e bo x (se e sectio n 20 ).
2 . Remov e th e glov e bo x bac k cove r an d th e blowe r
unde r cove r togethe r wit h th e glov e bo x fram e (se e
page 22-65 ).
3 . Remov e th e heate r outle t fro m th e heate r unit .
Disconnec t th e connecto r fro m th e ai r mi x contro l
motor , the n remov e th e self-tappin g screw s an d th e
ai r mi x contro l motor .
AIR MI XCONTRO L
MOTO R
HEATE R OUTLE T
4. Instal l i n th e revers e orde r o f removal . Afte r installa -
tion , mak e sur e th e ai r mi x contro l moto r run s
smoothly . 1
. Disconnec t th e 5 P connecto r fro m th e ai r mi x con -
tro l motor .
2 . Connec t batter y powe r t o th e No . 1 termina l o f th e
ai r mi x contro l moto r an d groun d th e No . 5 termi -
nal ; th e ai r mi x contro l moto r shoul d run , an d sto p
a t MA X COOL . I f i t doesn't , revers e th e connections ;
the ai r mi x contro l moto r shoul d run , an d sto p a t
MA X HOT .
NOTE : I f th e ai r mi x contro l moto r doe s no t run ,
remov e it , the n chec k th e ai r mi x contro l linkag e
an d door s fo r smoot h movement . I f the y mov e
smoothly , replac e th e ai r mi x contro l motor .
AIR MI X CONTRO L MOTO R5P CONNECTO R
3. Measur e th e resistanc e betwee n th e No . 2 an d No . 3
terminals . I t shoul d b e betwee n 4. 8 to 7. 2 k .
4 . Measur e th e resistanc e betwee n th e No . 3 an d No . 4
terminals . I t shoul d b e betwee n 0.9 6 t o 1.4 4 k a t
MAX COO L an d betwee n 3.8 4 t o 5.7 6 k a t MA X
HOT .
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Mode Contro l Moto r
Replacemen t Tes
t
1. Lowe r th e steerin g colum n assembl y (se e
section 17 ).
2 . Loose n th e mountin g bolt s of the PGM-F I mai n
relay/steerin g colum n contro l uni t bracket .
3 . Disconnec t th e wir e harnes s cli p an d th e connecto r
fro m th e mod e contro l motor , the n remov e th e self -
tappin g screw s an d th e mod e contro l motor .
MODE CONTRO L MOTO R
WIREHARNES SCLIP
4. Instal l i n th e revers e orde r o f removal . Afte r installa -
tion , mak e sur e th e mod e contro l moto r run s
smoothly . 1
. Disconnec t th e 5 P connecto r fro m th e mod e contro l
motor .
2 . Connec t batter y powe r t o th e No . 1 termina l o f th e
mod e contro l moto r an d groun d th e No . 5 terminal ;
th e mod e contro l moto r shoul d run , an d sto p a t
VENT . I f i t doesn't , revers e th e connections ; th e
mod e contro l moto r shoul d run , an d sto p a t DEF .
NOTE : I f th e mod e contro l moto r doe s no t run ,
remov e it , the n chec k th e mod e contro l linkag e an d
door s fo r smoot h movement . I f the y mov e smoothly ,
replac e th e mod e contro l motor .
MODE CONTRO L MOTO R5P CONNECTO R
3. Measur e th e resistanc e betwee n th e No . 2 an d No . 3
terminals . I t shoul d b e betwee n 4. 8 to 7. 2 k .
4 . Measur e th e resistanc e betwee n th e No . 3 an d No . 4
terminals . I t shoul d b e betwee n 0.9 6 t o 1.4 4 k a t
VEN T an d betwee n 3.8 4 to 5.7 6 k a t DEF .
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Recirculation Contro l Moto r
Replacemen t
1. Remov e th e glov e bo x (se e sectio n 20 ).
2 . Remov e th e glov e bo x bac k cove r (se e pag e 22-65 ).
3 . Disconnec t th e wir e harnes s cli p an d th e connecto r
fro m th e recirculatio n contro l motor , the n remov e
th e self-tappin g screw s an d th e recirculatio n contro l
motor.
RECIRCULATIO NCONTROL MOTO R
WIREHARNES SCLIP
4. Instal l i n th e revers e orde r o f removal . Afte r installa -
tion, mak e sur e th e recirculatio n contro l moto r run s
smoothly .
Test
1. Disconnec t th e 4 P connecto r fro m th e recirculatio n
contro l motor .
2 . Connec t batter y powe r t o th e No . 1 terminal , an d
groun d th e No . 2 an d No . 4 terminals ; th e recircula -
tio n contro l moto r shoul d ru n smoothly .
CAUTION : Neve r connec t th e batter y i n th e oppo -
sit e direction .
RECIRCULATIO N
CONTRO L MOTO R
4 P CONNECTO R
3. Disconnec t th e No . 2 or No . 4 terminal s fro m ground ;
th e recirculatio n contro l moto r shoul d sto p a t
FRES H o r RECIRCULATE .
NOTE: Don' t cycl e th e recirculatio n contro l moto r
fo r a lon g time .
4 . I f th e recirculatio n contro l moto r doe s no t ru n i n
ste p 2 , remov e it , the n chec k th e recirculatio n con -
tro l linkag e an d door s fo r smoot h movement . I f
the y mov e smoothly , replac e th e recirculatio n con -
trol motor .
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In-car Temperatur e Senso r
Replacemen t
1. Remov e th e in-ca r temperatur e senso r fro m th e
dashboard , the n disconnec t th e connecto r an d th e
ai r hose .
CAUTION : B e carefu l no t t o damag e th e in-ca r
temperatur e senso r an d th e dashboard .
AIR HOS E
IN-CA R TEMPERATUR E SENSO R
2. Instal l i n th e revers e orde r o f removal .
NOTE : B e sur e to connec t th e ai r hos e securely .
Test
Compar e th e resistanc e readin g betwee n th e No . 1 an d
No . 2 terminal s o f th e in-ca r temperatur e senso r wit h
the specification s show n i n followin g graph ; resistanc e
should b e withi n specifications .
NOTE : Chec k fo r chang e i n resistanc e b y heatin g o r
coolin g th e senso r wit h a hai r drier , etc .
CAUTION : Th e senso r use s a thermisto r whic h ca n b e
damage d i f hig h curren t i s applie d durin g testing .
Therefore , us e a circui t teste r wit h a n outpu t o f 1 m A o r
les s a t th e 2 0 k range .
IN-CAR TEMPERATUR E SENSO R
2 P CONNECTO R
RESISTANC E
(k )
TEMPERATUR E
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Outside Ai r Temperatur e Senso r
Replacemen t
Disconnect th e connecto r fro m th e outsid e tempera -
tur e sensor , the n remov e th e bol t an d th e outsid e
ai r temperatur e sensor .
6 x 1. 0 m m9.8 N- m (1. 0 kgf-m , 7. 2 Ibf-ft )
OUTSID E AI R TEMPERATUR E SENSO R
2. Instal l i n th e revers e orde r o f removal .
Test
Compar e th e resistanc e readin g betwee n th e No . 1 an d No .
2 terminal s o f th e outsid e ai r temperatur e senso r wit h th e
specification s show n i n followin g graph ; resistanc e shoul d
be withi n specifications .
NOTE: Di p th e senso r i n ic e water , an d measur e resis -
tance . The n pou r ho t wate r o n th e sensor , an d chec k fo r
chang e in resistance .
CAUTION : Th e senso r use s a thermisto r whic h ca n b e
damage d i f hig h curren t i s applie d durin g testing .
Therefore , us e a circui t teste r wit h a n outpu t o f 1 m A o r
les s a t th e 2 0 k range .
OUTSIDE AI R TEMPERATUR E SENSO R
2 P CONNECTO R
Termina l sid e o f mal e terminal s
RESISTANC E(k )
14-1 032O501 0682 0863 0104° F40°C
TEMPERATUR E
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Sunlight Senso r
Replacemen t
Remove th e sunligh t o r sunlight/automati c lightin g
sensor(s ) fro m th e dashboard , the n disconnec t th e
connector . Separat e th e sunligh t an d automati c light -
ing sensor(s) .
CAUTION: B e carefu l no t t o damag e th e sunligh t o r
sunlight/automati c lightin g sensor(s ) an d th e dash -
board .
SUNLIGH T SENSO R
AUTOMATI C LIGHTIN GSENSOR
2. Instal l i n th e revers e orde r o f removal .
Test
Turn th e ignitio n switc h O N (II) . Measur e th e voltag e
betwee n th e terminal s wit h th e (+ ) prob e o n th e No . 2
termina l an d th e (- ) prob e o n th e No . 1 termina l wit h th e
2 P connecto r connected . Voltag e shoul d be ;
3. 5 to 3. 9 V or mor e wit h th e senso r ou t o f direc t sun -
light.
3.8 to 3. 4 V or les s wit h th e senso r i n direc t sunlight .
NOTE : Th e voltag e wil l no t chang e unde r th e ligh t o f a
flashligh t o r a fluorescen t lamp .
SUNLIGH T SENSO R
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Evaporator Temperatur e
Sensor Powe r Transisto r
Test
Compar e th e resistanc e readin g betwee n th e No . 1 an d
No . 2 terminal s o f th e evaporato r temperatur e senso r
wit h th e specification s show n i n followin g graph ; resis -
tanc e shoul d b e withi n specifications .
NOTE : Di p th e senso r i n ic e water , an d measur e resis -
tance . The n pou r ho t wate r o n th e sensor , an d chec k fo r
chang e in resistance .
CAUTION : Th e senso r use s a thermisto r whic h ca n b e
damage d i f hig h curren t i s applie d durin g testing .
Therefore , us e a circui t teste r wit h a n outpu t o f 1 m A o r
les s a t th e 2 0 k range .
EVAPORATO R TEMPERATUR E SENSO R
2 P CONNECTO R
Test
Termina l sid e o f mal e terminal s
RESISTANC E
k
1. Disconnec t th e 3 P connecto r fro m th e powe r tran -
sistor .
2 . Pul l ou t th e No . 2 (ORN ) termina l fro m th e connec -
tor.
3. Connec t a 1. 2 - 3. 4 wat t bul b a s shown , the n recon -
nec t th e 3 P connecto r t o th e powe r transistor .
12V 1.2-3. 4 WBUL B
No. 3 (BLU/RED )
4. Tur n th e ignitio n switc h O N (II) , an d chec k tha t th e
blowe r moto r runs .
CAUTION :
T o avoi d a loos e o r disconnecte d terminal , b e carefu l
no t t o damag e th e lockin g ta b whe n disconnectin g
an d connectin g th e terminal .
Insulat e th e No . 2 (ORN ) termina l fro m th e bod y unti l
th e testin g is completed .
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Relays

Test

There should be continuity between the No. 1 and No. 3

terminals when power and ground are connected to the

No. 2 and No. 4 terminals, and there should be no conti-

nuity when power is disconnected.

Radiator fan relay

Condenser fan relay

Compressor clutch relay
Blower motor relay

Blower motor high relay

There should be continuity between the No. 4 and No. 5

terminals when power and ground are connected to the

No. 1 and No. 3 terminals, and there should be continu-

ity between the No. 2 and No. 5 terminals when power

is disconnected.

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Evaporator/Blower Uni t
Replacemen t
SRS component s ar e locate d i n thi s area . Revie w th e
SR S componen t locations , precautions , an d procedure s
i n th e SR S (sectio n 24 ) befor e performin g repair s o r ser -
vice .
1 . Recove r th e refrigeran t wit h a recovery/recycling /
chargin g statio n (se e pag e 22-75 ).
2 . Remov e th e bol t an d th e clam p fro m th e evaporator .
Remov e th e bolt , the n disconnec t th e capillar y tub e
fro m th e suctio n line . Remov e th e bolts , the n discon -
nec t th e suctio n an d receive r line s fro m th e evapora -
tor . Remov e th e mountin g nu t fro m th e evaporator .
NOTE:
Be carefu l no t t o damag e o r ben d th e capillar y tube .
Plu g o r ca p th e line s immediatel y afte r discon -
nectin g the m to avoi d moistur e an d dus t contami -
nation .
6 x 1. 0 m m9.8 N- m (1. 0 kgf-m , 7. 2 Ibf-ft )
CAPILLAR Y TUB E
CLAM P
6 x 1. 0 m m9.8 N- m (1. 0 kgf-m ,
7. 2 Ibf-ft )
RECEIVE R LIN E
SUCTIO N LIN E
3. Tur n th e ignitio n switc h O N (II) , an d se t th e recircu -
latio n contro l switc h o n RECIRCULATE .
4 . Remov e th e glov e bo x (se e sectio n 20 ).
5 . Remov e th e trun k opene r mai n switc h connector ,
th e self-tappin g screw s an d th e glov e bo x bac k
cover .
GLOV E BO XBAC K COVE RTRUNK OPENE R MAI N
SWITC H CONNECTO R
6.Remov e th e servic e chec k connector , th e screw s
an d th e bolt , the n remov e th e blowe r unde r cove r
with th e glov e bo x frame .
SERVIC E CHEC K CONNECTO R
GLOV E BO X FRAM E
BLOWER UNDE R COVE R
7. Disconnec t th e A/ C wir e harnes s connecto r fro m th e
mai n wir e harness . Remov e th e wir e harnes s clips .
Disconnec t th e connector s fro m th e recirculatio n
contro l motor , th e evaporato r temperatur e sensor ,
th e powe r transisto r an d th e blowe r motor . Remov e
the screw , the n remov e th e blowe r moto r rela y an d
the blowe r moto r hig h rela y togethe r wit h th e
bracket .
WIRE HARNES S CLIP SBLOWE
R MOTO R RELAY ,
BLOWE R MOTO R HIG H RELA Y
A/ C WIR E HARNES S
CONNECTO R
EVAPORATO RTEMPERATUR E
SENSO R
RECIRCULATIO N
CONTRO L MOTO R
BLOWER MOTO R
POWE R TRANSISTO R
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