ACURA RL KA9 1996 Service Repair Manual

Troubleshooting
Mode Contro l Moto r
Self-diagnosi s indicato r ligh t F come s on : A proble m in th e mod e contro l moto r circuit .
Th e mod e contro l moto r controls , th e outle t ai r directio n an d volum e accordin g t o outpu t fro m th e climat e contro l unit .
Chec k th e mod e contro l motor :
1 . Disconnec t th e mod e contro l
moto r 5 P connector .
2 . Tes t th e mod e contro l moto r
(see pag e 22-58 ).
Chec k th e mod e contro l linkag eand doors :1. Remov e th e mod e contro l
moto r (se e pag e 22-58 ).
2 . Chec k th e mod e contro l link -
ag e an d door s fo r smoot h
movement .
Check fo r a shor t i n th e wire(s) :1. Remov e th e climat e contro l
uni t (se e pag e 22-55 ), an d dis -
connec t th e 8 P an d 20 P con -
nectors .2. Chec k fo r continuit y betwee n
bod y groun d an d th e 8 P con -
necto r terminal s No . 2 an d 3
individually , an d betwee n
bod y groun d an d th e 20 P con -
necto r terminal s No . 7 , 8 an d
1 4 individually .
To pag e 22-2 7
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CLIMATE CONTRO L UNI T 8 P CONNECTO R
Fro m pag e 22-2 6
Chec k fo r a shor t t o power :
Chec k th e sam e terminal s fo r
voltage .
I s ther e an y voltage ?
Chec k fo r a n ope n in th e wire(s) :
Chec k fo r continuit y betwee n fol -
lowin g terminal s o f th e climat e
contro l uni t 8 P an d 20 P connec -
tor s an d th e mod e contro l moto r
5 P connector .
8P:No . 2No . 320P :No. 7No . 8No . 1 4
5P :No . 3No . 2
No . 5No . 1No . 4
Is ther e continuity ?
Chec k fo r loos e wire s o r poo r con -
nection s a t th e climat e contro l
uni t 8 P an d 20 P connector s an d a t
th e mod e contro l moto r 5 P con -
nector . I f th e connection s ar e
good , substitut e a known-goo d
climat e contro l unit , an d recheck .
If th e symptom/indicatio n goe saway , replac e th e origina l climat e
contro l unit . Wir
e sid e o f femal e terminal s
CLIMAT E CONTRO L UNI T 20 P CONNECTO R
Repai r shor t t o powe r i n th e wir e
betwee n th e climat e contro l uni t
an d th e mod e contro l motor .
(Thi s damage s th e climat e con -
tro l unit. ) Wir
e sid e o f femal e terminal s
CONTRO L MOTO R5P CONNECTO RWire sid e o f femal e terminal s
Repai r an y ope n i n th e wire(s )
betwee n th e climat e contro l uni t
an d mod e contro l motor .
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Troubleshooting
Blower Moto r Spee d
Self-diagnosi s indicato r ligh t G come s on : A proble m in th e blowe r moto r circuit .
The spee d o f th e blowe r moto r i s controlle d b y signal s sen t fro m th e climat e contro l unit .
Blowe r moto r onl y run s o n hig h
spee d position ; doe s no t ru n i n
an y othe r spee d positions .
Self-diagnosi s circui t chec k indi -
cate s a proble m i n th e blowe r
moto r circuit .
Chec k fo r a n ope n in th e wire :
1 . Disconnec t th e powe r transis -
to r 3 P connector.
2. Chec k fo r continuit y betwee nthe No . 1 termina l an d bod yground .
Is ther e continuity ?
Chec k fo r a n ope n in th e wire :
1 . Connec t th e No . 1 an d No . 3
terminal s o f th e powe r tran -
sisto r 3 P connecto r wit h a
jumpe r wire .2. Tur n th e ignitio n switc h O N (II) .
Doe s th e blowe r moto r ru n a t
hig h speed ?
I s ther e continuity ?
To pag e 22-2 9
NOTE : I f th e blowe r moto r doe s no t
ru n a t all , refe r t o pag e 22-30 .
POWE R TRANSISTO R 3 P CONNECTO R
Wire sid e o f femal e terminal s
Check fo r a n ope n i n th e wir e
betwee n th e powe r transisto r
an d bod y ground . I f th e wir e i s
OK , chec k fo r poo r groun d a t
G40 1 an d G402 .
Repai r ope n in th e wir e betwee n
th e powe r transisto r an d th e
blowe r motor . JUMPE
R
WIRE
CLIMAT E CONTRO L UNI T 20 P CONNECTO RWire sid e o f femal e terminal s
Repair ope n in th e wir e betwee n
th e powe r transisto r an d th e cli -
mat e contro l unit .
Chec
k fo r a n ope n in th e wire :
1 . Tur n th e ignitio n switc h OFF .
2 . Disconnec t th e jumpe r wire .
3 . Remov e th e climat e contro l
uni t (se e pag e 22-55 ), an d dis -
connec t th e 8 P an d 20 P con -
nectors .
4 . Chec k fo r continuit y betwee n
the No . 1 termina l o f th e cli -mat e contro l uni t 20 P connec -
to r an d th e No . 2 termina l o f
th e powe r transisto r 3 P con -
nector .
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From pag e 22-2 8
Chec k fo r a shor t i n th e wire :
Chec k fo r continuit y betwee n th e
No . 1 termina l o f th e climat e con -
tro l uni t 20 P connecto r an d bod y
ground .
Is ther e continuity ?
Check fo r a n ope n in th e wire :
1 . Tur n th e ignitio n switc h O N (II) .
2 . Measur e th e voltag e betwee n
th e No . 8 termina l o f th e cli -
mat e contro l uni t 8 P connecto r
an d bod y ground .
I s ther e batter y voltage ?
Chec k th e powe r transistor :
1 . Tur n th e ignitio n switc h OFF .
2 . Reconnec t th e climat e contro l
uni t 8 P an d 20 P connectors .
3 . Tes t th e powe r transisto r (se e
page 22-63 ).
Is th e powe r transisto r OK ?
Chec k fo r loos e wire s o r poo r con -
nection s a t th e climat e contro l
uni t 8 P an d 20 P connector s an d a t
th e powe r transisto r 3 P connec -
tor . I f th e connection s ar e good ,
substitut e a known-goo d climat e
contro l unit , an d recheck . I f th e
symptom/indicatio n goe s away ,
replac e th e origina l climat e con -
tro l unit . CLIMAT
E CONTRO L UNI T 20 P CONNECTO R
Wir e sid e o f femal e terminal s
Repai r shor t i n th e wir e betwee n
the climat e contro l uni t an d th epowe r transistor .
CLIMATE CONTRO L UNI T 8 P CONNECTO R
Wir e sid e o f femal e terminal s
Repai r ope n in th e wir e betwee n
th e climat e contro l uni t an d th e
blowe r motor .
Replac e th e powe r transistor .
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Troubleshooting
Blower Moto r
Self-diagnosi s indicato r ligh t G come s on : A proble m in th e blowe r moto r circuit .
The spee d o f th e blowe r moto r i s controlle d b y signal s sen t fro m th e climat e contro l unit .
Blowe r moto r doe s no t ru n a t all .
Self-diagnosi s circui t chec k indi -
cate s a proble m in th e blowe r
moto r circuit .
Chec k th e No . 3 7 (4 0 A ) fus e in th e
under-hoo d fuse/rela y box , an d
th e No . 3 (7. 5 A ) fus e in th e under -
das h fuse/rela y box .
Ar e th e fuse s OK ?
Chec k th e blowe r moto r inpu t
and outpu t circuit :1. Connec t th e No . 2 termina l o f
th e blowe r moto r 2 P connec -
tor t o bod y groun d wit h ajumpe r wire .
2 . Tur n th e ignitio n switc h O N (II) .
Doe s th e blowe r moto r run ?
Chec k th e blowe r motor :
1 . Disconnec t th e jumpe r wir e
an d th e blowe r moto r 2 P con -
nector .
2. Measur e th e voltag e betwee n
th e No . 1 termina l an d bod y
ground .
I s ther e batter y voltage ?
Chec k th e blowe r moto r relay :
1 . Tur n th e ignitio n switc h OFF .
2 . Remov e th e blowe r moto r
relay , an d tes t i t (se e pag e
22-64 ).
T o pag e 22-3 3 Replac
e th e fuse(s) , an d recheck .
BLOWER MOTO R 2 P CONNECTO R
JUMPERWIRE
To pag e 22-3 1 Wir
e sid e o f femal e terminal s
Replac e th e blowe r motor .
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From pag e 22-3 0
Chec k th e blowe r moto r hig h
relay :1. Tur n th e ignitio n switc h OFF ,and disconnec t th e jumpe r
wire .
2 . Remov e th e blowe r moto r
hig h relay , an d tes t i t (se e
page 22-64 ).
Is th e rela y OK ?
Chec k fo r a n ope n in th e wire :
1 . Connec t th e No . 5 termina l o f
th e blowe r moto r hig h rela y
5 P connecto r t o bod y groun d
wit h a jumpe r wire .
2 . Tur n th e ignitio n switc h O N (II) .
Doe s th e blowe r moto r run ?
I s ther e batter y voltage ?
Chec k fo r a n ope n in th e wire :
1. Tur n th e ignitio n switc h OFF .2. Chec k fo r continuit y betwee nthe No . 4 termina l o f th eblowe r moto r hig h rela y 5 P
connecto r an d bod y ground .
I s ther e continuity ?
To pag e 22-3 2
Replac e th e blowe r moto r hig hrelay .
BLOWE R MOTO R HIG H RELA Y 5 P CONNECTO R
Repair ope n in th e wir e betwee n
th e blowe r moto r an d th e blowe r
moto r hig h relay . Wir
e side of femal e terminal s
Repai r ope n in th e wir e betwee n
th e No . 3 fus e an d th e blowe r
moto r hig h relay .
Chec k fo r a n ope n i n th e wir e
betwee n th e blowe r moto r hig h
rela y an d bod y ground . I f th e wir e
is OK , chec k fo r poo r groun d a tG40 1 an d G402 .
Chec
k fo r a n ope n in th e wire :
1 . Tur n th e ignitio n switc h OFF ,
an d disconnec t th e jumpe r
wire .
2 . Tur n th e ignitio n switc h O N (II) .
3 . Measur e th e voltag e betwee n
th e No . 3 termina l o f th e
blowe r moto r hig h rela y 5 P
connecto r an d bod y ground .
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Troubleshooting
Blower Moto r (cont'd )
From pag e 22-3 1 BLOWE
R MOTO R HIG H RELA Y 5P CONNECTO R
Wir e sid e o f femal e terminal s
Chec k fo r a n ope n in th e wire :
1 . Remov e th e climat e contro l
uni t (se e pag e 22-55 ), an d dis -
connect the 8 P an d 20 P con -
nectors .2. Chec k fo r continuit y betwee n
th e No . 8 termina l o f th e 8 P
connecto r an d th e No . 5 ter -
mina l o f th e blowe r moto r
hig h rela y 5 P connector .
I s ther e continuity ? Repai
r ope n in th e wir e betwee n
th e climat e contro l uni t an d th e
blowe r moto r hig h relay . CLIMAT
E CONTRO L UNI T 8 P CONNECTO R
Wir e sid e o f femal e terminal s
Chec k fo r a n ope n in th e wire :
Chec k fo r continuit y betwee n th e
No . 1 3 termina l o f th e 20 P connec -
to r an d th e No . 1 termina l o f th e
blowe r moto r hig h rela y 5 P con -
nector .
CLIMAT E CONTRO L UNI T 20 P CONNECTO R
Wir e sid e o f femal e terminal s
I s ther e continuity ? Repai
r ope n in th e wir e betwee n
th e climat e contro l uni t an d th e
blowe r moto r hig h relay .
Chec k fo r loos e wire s o r poo r con -
nection s a t th e climat e contro l
uni t 8 P an d 20 P connector s an d a t
th e blowe r moto r hig h rela y 5 P
connector . I f th e connection s ar e
good , substitut e a known-goo d
climat e contro l unit , an d recheck .
I f th e symptom/indicatio n goe s
away , replac e th e origina l climat e
contro l unit .
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From pag e 22-3 0
I s th e rela y OK ?
Replace th e blowe r moto r relay .
BLOWE R MOTO R RELA Y 5 P CONNECTO R
Check fo r a n ope n in th e wire :
Measur e th e voltag e betwee n th e
No . 5 termina l o f th e blowe r
moto r rela y 5 P connecto r an d
bod y ground .
I s ther e batter y voltage ? Repai
r ope n in th e wir e betwee n
th e No . 3 7 fus e an d th e blowe r
moto r relay . Wir
e sid e o f femal e terminal s
Chec k fo r a n ope n in th e wire :
1 . Tur n th e ignitio n switc h O N (II) .
2 . Measur e th e voltag e betwee n
th e No . 3 termina l o f th e blow -
e r moto r rela y 5 P connecto r
an d bod y ground .
I s ther e batter y voltage ? Repai
r ope n in th e wir e betwee n
th e No . 3 fus e an d th e blowe r
moto r relay .
I s ther e continuity ?
Repai r ope n in th e wir e betwee n
th e blowe r moto r rela y an d th e
blowe r motor . Chec
k fo r a n ope n i n th e wir e
betwee n th e blowe r moto r rela y
an d bod y ground . I f th e wir e i s
OK , chec k fo r poo r groun d a t
G404 .
Check fo r a n ope n in th e wire :
1 . Tur n th e ignitio n switc h OFF .
2 . Chec k fo r continuit y betwee n
th e No . 1 termina l o f th e blow -
e r moto r rela y 5 P connecto r
an d bod y ground .
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Troubleshooting
Recirculation Contro l Moto r
Recirculatio n contro l door s d o
no t chang e betwee n FRES H an d
RECIRCULATE .
Check th e No . 3 (7. 5 A ) fus e in th eunder-das h fuse/rela y box .
I s th e fus e OK ?
Replac e th e fuse , an d recheck .
RECIRCULATIO N CONTRO L MOTO R4P CONNECTO R
Check fo r a n ope n in th e wire :
1 . Disconnec t th e recirculatio n
contro l moto r 4 P connector .
2 . Tur n th e ignitio n switc h O N (II) .
3 . Measur e th e voltag e betwee n
th e No . 1 termina l an d bod y
ground .
I s ther e batter y voltage ?
Chec k th e recirculatio n contro l
motor:1. Tur n th e ignitio n switc h OFF .
2 . Tes t th e recirculatio n contro l
moto r (se e pag e 22-59 ).
I s th e recirculatio n contro l
moto r
OK?
To pag e 22-3 5
Repai r ope n in th e wir e betwee nthe No . 3 fus e an d th e recircula -tion contro l motor . Wir
e sid e o f femal e terminal s
Chec k th e recirculatio n contro l
linkag e an d doors :
1 . Remov e th e recirculatio n con -
tro l moto r (se e pag e 22-59 ).
2 . Chec k th e recirculatio n contro l
linkag e an d door s fo r smoot h
movement .
D o th e recirculatio n contro l link -
ag e an d door s mov e smoothly ? Repai
r th e recirculatio n contro l
linkag e o r doors .
Replac e th e recirculatio n contro l
motor.
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From pag e 22-3 4
Chec k fo r a shor t i n th e wire(s) :
1 . Remov e th e climat e contro l
uni t (se e pag e 22-55 ), an d dis -
connec t th e 8 P an d 20 P con -
nectors .2. Chec k fo r continuit y betwee n
th e No . 1 9 an d No . 2 0 termi -
nal s o f th e 20 P connecto r an d
bod y groun d individually .
I s ther e continuity ?
Chec k fo r a shor t t o power :
Chec k th e sam e wire s fo r voltage .
I s ther e an y voltage ?
Chec k fo r a n ope n in th e wire(s) :
Chec k fo r continuit y betwee n th e
followin g terminal s o f th e recircu -
latio n contro l moto r 4 P connecto r
an d th e climat e contro l uni t 20 P
connector .4P: 20P :No. 2 —No . 20
No . 4 —No . 19
Is ther e continuity ?
Chec k fo r loos e wire s o r poo r
connection s a t th e climat e con -
tro l uni t 20 P connecto r an d a t th e
recirculatio n contro l moto r 4 P
connector . I f th e connection s ar e
good , substitut e a known-goo d
climat e contro l unit , an d recheck .
I f th e symptom/indicatio n goe s
away , replac e th e origina l climat e
control unit .
CLIMAT E CONTRO L UNI T 20 P CONNECTO R
Wir e sid e o f femal e terminal s
Repai r shor t i n th e wire(s ) betwee n
th e recirculatio n contro l moto r an d
th e climat e contro l unit .
Repai r shor t t o powe r i n th e wir e
betwee n th e recirculatio n contro l
moto r an d th e climat e contro l
unit . (Thi s damage s th e climat e
contro l unit. )
Repai r ope n in th e wire(s ) betwee n
th e recirculatio n contro l moto r
an d th e climat e contro l unit . RECIRCULATIO
N CONTRO L MOTO R
4 P CONNECTO R
Wir e sid e o f femal e terminal s
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