ACURA RL KA9 1996 Service Repair Manual

Troubleshooting
Both Fan s Lo w Spee d an d Condense r Fa n Hig h Spee d (cont'd )
From pag e 22-4 4
Chec k fo r a n ope n in th e wire :
1 . 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 . 2 termina l o f th e con -
dense r fa n rela y 4 P socke t
and bod y ground .
Is ther e batter y voltage ?
CONDENSE R FA N RELA Y 4 P SOCKE T
Repair ope n i n th e wir e betwee n
th e No . 3 fus e an d th e condense r
fa n relay .
FAN CONTRO L UNI T 12 P CONNECTO R
I s ther e batter y voltage ? Repai
r ope n in th e wir e betwee n
th e condense r fa n rela y an d th e
fan contro l unit . Wir
e sid e o f femal e terminal s
Check fo r loos e wire s o r poo r
connection s a t th e fa n contro l
uni t 12 P connector . I f th e connec -
tion s ar e good , substitut e a
known-goo d fa n contro l unit , an d
recheck . I f th e symptom/indi -
catio n goe s away , replac e origi -
nal fa n 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 ,then reinstal l th e condense r
fa n relay .
2 . Disconnec t th e fa n contro l uni t
12 P connector .
3 . Tur n th e ignitio n switc h O N (II) .
4 . Measur e th e voltag e betwee n
the No . 1 0 termina l an d bod yground .
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Both Fans Low Speed

Both fans do not run at low speed

(but both fans run at high speed).

Check for an open in the wire:

1. Remove the radiator fan main

relay from the under-hood

relay box A.

2. Disconnect the radiator fan 2P

connector.

3. Check for continuity between

the No. 2 terminal of the radi-

ator fan main relay 5P socket

and the No. 2 terminal of the

radiator fan 2P connector.
NOTE: It is normal for both fans to run at high speed when the system pressure is above

1,520 kPa (15.5 kgf/cm2, 220 psi), or when the engine coolant temperature is above 194°F

(90°C).

RADIATOR FAN 2P CONNECTOR

Wire side of female terminals

RADIATOR FAN MAIN RELAY 5P SOCKET

Is there continuity?
Repair open in the wire between

the radiator fan main relay and

the radiator fan.

Replace the radiator fan main

relay.ProCarManuals.com

Troubleshooting
Both Fan s Hig h Spee d
Is ther e batter y voltage ?
Chec k fo r loos e wire s o r poo r con -
nection s a t th e fa n contro l uni t
12 P connector . I f th e connection s
ar e good , substitut e a known -
goo d fa n contro l unit , an d
recheck . I f th e symptom/indi -
catio n goe s away , replac e origina l
fa n contro l unit . NOTE
: I t i s norma l fo r bot h fan s t o ru n a t hig h spee d whe n th e syste m pressur e i s abov e
1,52 0 kP a (15. 5 kgf/cm
2, 22 0 psi) , o r whe n th e engin e coolan t temperatur e is abov e 194° F(90°C) .
FAN CONTRO L UNI T 12 P CONNECTO R
Repai r ope n in th e wir e betwee n
th e radiato r fa n mai n relay , th e
radiato r fa n rela y an d th e fa n
contro l unit . Wir
e sid e o f femal e terminal s
Bot
h fan s d o no t ru n a t hig h spee d
(bu t bot h fan s ru n a t lo w speed) .
Chec k fo r a n ope n in th e wire :
1 . Disconnec t th e fa n contro l
uni t 12 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 . 5 termina l an d bod y
ground .
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Compressor
Compresso r clutc h doe s no t
engage .
Chec k th e No . 3 (7. 5 A ) an d No . 5
(2 0 A ) fuse s in th e under-das h fuse /
rela y box .
Ar e th e fuse s OK ?
Remov e th e compresso r clutc h
rela y fro m th e under-hoo d rela y
bo x A , an d tes t i t (se e pag e
22-64 ).
Is th e rela y OK ?
Chec k fo r a n ope n in th e wire :
Measur e th e voltag e betwee n th e
No. 1 termina l o f th e compresso rclutch rela y 4 P socke t an d bod yground .
Is ther e batter y voltage ?
Chec k th e compresso r clutch :
Connec t th e No . 1 an d No . 3 termi -
nal s o f th e compresso r clutc h rela y
4P socke t wit h a jumpe r wire .
Does th e compresso r clutc h click ?
Chec k fo r a n ope n in th e wire :
1 . 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 nthe No . 2 termina l o f th e com -presso r clutc h rela y 4 P socke tand bod y ground .
Is ther e batter y voltage ?
T o pag e 22-5 1 Replac
e th e fuse(s) , an d recheck .
Replac e th e compresso r clutc h
relay .
COMPRESSOR CLUTC H RELA Y
4 P SOCKE T
Repai r ope n i n th e wir e betwee n
th e No . 5 fus e an d th e compres -
so r clutc h relay .
T o pag e 22-5 0
Repai r ope n i n th e wir e betwee n
th e No . 3 fus e an d th e compres -
so r clutc h relay . JUMPE
R
WIRE
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Troubleshooting
Compressor (cont'd )
From pag e 22-4 9
Chec k fo r a n ope n in th e wire :
1 . Disconnec t th e jumpe r wire .
2. Disconnec t th e compresso rclutch 1 P connector .
3 . Chec k fo r continuit y betwee n
the No . 3 termina l o f th e com -presso r clutc h rela y 4 P socke tand th e termina l o f th e com -presso r clutc h 1 P connector . COMPRESSO
R CLUTC H RELA Y
4 P SOCKE T
COMPRESSO R CLUTC H 1 P CONNECTO R
Wir e sid e o f femal e terminal s
I s ther e continuity ? Repai
r ope n i n th e wir e betwee n
th e compresso r clutc h rela y an d
th e compresso r clutch .
Inspec t th e compresso r clutc h
clearanc e an d th e compresso r
clutch fiel d coi l (se e pag e 22-82 ).
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From pag e 22-4 9
Chec k th e PC M (AC C an d AC S
lines) :1. Tur n th e ignitio n switc h OFF ,then reinstal l th e compresso r
clutc h relay .
2 . Disconnec t th e fa n contro l
uni t 12 P connector .
3 . Connec t th e No . 8 termina l an d
bod y groun d wit h a jumpe rwire.
4 . Tur n th e ignitio n switc h O N (II) ,
an d star t th e engine .
Doe s th e compresso r clutc h
engage ?
Is ther e continuity ?
Test th e radiato r fa n contro l sen -
so r (se e Fa n Control s i n
section 10 ).
Is th e senso r OK ?
Chec k fo r loos e wire s o r poo r
connection s a t th e fa n contro l
uni t 12 P connector . I f th e con -
nection s ar e good , substitut e a
known-goo d fa n contro l unit ,
an d recheck . I f th e symptom /
indicatio n goe s away , replac e
origina l fa n contro l unit . FA
N CONTRO L UNI T 12 P CONNECTO R
T o pag e 22-5 2 Wir
e sid e o f femal e terminal s
RADIATO R FA N CONTRO L SENSO R 2 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
th e radiato r fa n contro l senso r
an d th e fa n contro l unit .
Replac e th e radiato r fa n contro lsensor.
Check fo r a shor t i n th e wire :1. Tur n th e ignitio n switc h OFF ,then disconnec t th e jumpe rwire.2. Disconnec t th e radiato r fa n
contro l senso r 2 P connector .
3 . Chec k fo r continuit y betwee n
th e No . 2 termina l an d bod y
ground . JUMPE
R
WIRE
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Troubleshooting
Compressor (cont'd )
From pag e 22-5 1
Chec k fo r a n ope n in th e wire :
1 . Tur n th e ignitio n switc h OFF ,
the n disconnec t th e jumpe r
wire .
2 . Mak e sur e th e A/ C is OFF , the n
tur n th e ignitio n switc h O N (II) .
3 . Usin g a *Backprob e Se t (T/ N
07SA Z-001000A ), measur e
th e voltag e betwee n th e No . 8
termina l o f th e PC M connec -
to r A (26P ) an d bod y groun d
wit h th e PC M connector s con -
nected .
Is ther e batter y voltage ?
I s ther e continuity ?
Chec k fo r loos e wire s o r poo r
connection s a t th e PC M connec -
tor A (26P ) an d C (12P) . I f th e con -nection s ar e good , substitut e a
known-goo d PCM , an d recheck . I f
th e symptom/indicatio n goe s
away , replac e th e origina l PCM . PC
M CONNECTO R A (26P )
Wir e sid e o f femal e terminal s
Repai r ope n i n th e wir e betwee n
th e compresso r clutc h rela y an d
the PCM .FAN CONTRO L UNI T 12 P CONNECTO R
Wir e sid e o f femal e terminal s
Repai r ope n i n th e wir e betwee n
th e fa n contro l uni t an d th e PCM .
PCM CONNECTO R C (12P )
Wir e sid e o f femal e terminal s
*Ho w to us e th e backprob e set s
Connec t th e backprob e adapter s t o th e stackin g patc h cords , an d connec t th e cord s t o a
multimeter . Usin g th e wir e insulatio n a s a guid e fo r th e contoure d ti p o f th e backprob e
adapter , gentl y slid e th e ti p int o th e connecto r fro m th e wir e sid e unti l i t come s i n con -
tac t wit h th e termina l en d o f th e wir e (se e sectio n 11 ).
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 PC M connec -
tor C (12P) .3. Chec k fo r continuit y betwee n
th e No . 8 termina l o f th e fa n
contro l uni t 12 P connecto r an d
th e No . 2 termina l o f th e PC M
connecto r C (12P) .
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A/C Syste m
Both fan s an d compresso r d o no t
wor k a t all .
Chec k th e No . 3 (7. 5 A ) fus e i n
th e under-das h fuse/rela y box .
I s th e fus e OK ?
Chec k fo r a n ope n in th e wire :
1 . Disconnec t th e fa n contro l
uni t 12 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 . 7 termina l an d bod y
ground .
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 n
th e No . 3 termina l o f th e fa n
contro l uni t an d bod y ground .
I s ther e continuity ?
YES
Chec k fo r a n ope n in th e wire :
1 . Reconnec t th e fa n contro l uni t
12P connector .2. Disconnec t th e A/ C pressur e
switc h 4 P connector .
3 . Tur n th e ignitio n switc h O N (II) .
4 . Measur e th e voltag e betwee n
th e No . 4 termina l an d bod y
ground .
I s ther e batter y voltage ?
Chec k th e fa n contro l unit :
Measur e th e voltag e betwee n th e
No . 4 termina l o f th e fa n contro l
uni t 12 P connecto r an d bod y
groun d wit h th e fa n contro l uni t
12 P connecto r connected .
I s ther e batter y voltage ?
Chec k fo r loos e wire s o r poo r
connection s a t th e fa n contro l
uni t 12 P connector . I f th e con -
nection s ar e good , substitut e a
known-goo d fa n contro l unit ,
an d recheck . I f th e symptom /
indicatio n goe s away , replac e
th e origina l fa n contro l unit . Replac
e th e fuse , an d recheck .
FAN CONTRO L UNI T 12 P CONNECTO R
Repai r ope n i n th e wir e betwee n
th e No . 3 fus e an d th e fa n con -
tro l uni t Wir
e sid e o f femal e terminal s
Chec k fo r a n ope n i n th e wir e
betwee n th e fa n contro l uni t 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 .
A/C PRESSUR E SWITC H 4P CONNECTO R
T o pag e 22-5 4
Wire sid e o f femal e terminal s
Repai r ope n i n th e wir e betwee n
th e A/ C pressur e switc h an d th e
fa n contro l unit .
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Troubleshooting
A/C Syste m (cont'd )
From pag e 22-5 3
Chec k th e A/ C pressur e switch :
1 . Tur n th e ignitio n switc h OFF .
2 . Chec k fo r continuit y betwee n
th e No . 1 an d No . 4 terminal s
o f th e A/ C pressur e switch .
I s ther e continuity ?
Chec k fo r a n ope n in th e wire :
1 . Reconnec t th e A/ C pressur e
switc h 4 P connector .
2 . 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 .
3 . Tur n th e ignitio n switc h O N (II) .
4 . Measur e th e voltag e betwee n
the No . 1 2 termina l o f th e 20 Pconnecto r an d bod y ground .
I s ther e batter y voltage ?
Chec k fo r a n ope n in th e wire :
Measur e th e voltag e betwee n th e
No . 1 termina l o f th e climat e con -
tro l uni t 8 P connecto r an d bod y
ground .
Is 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 n
th e No . 7 termina l o f th e cli -
mat e control unit 8 P connec -
to r an d bod y groun d
I s 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 connectors . 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/indi -
catio n goe s away , replac e th e
origina l climat e contro l unit .
A/C PRESSUR E SWITC H
Is th e pressur e withi n specifi -cations?Repair th e A/ C pressur e prob -lem.
CLIMAT E CONTRO L UNI T 20 P CONNECTO R
Repai r ope n in th e wir e betwee n
th e A/ C pressur e switc h an d th e
climat e contro l unit .
Wire sid e o f femal e terminal s
CLIMAT E CONTRO L UNI T 8 P CONNECTO R
Repai r ope n in th e wir e betwee n
th e No . 3 fus e an d th e climat e
contro l unit .
Wire sid e o f femal e terminal s
Chec k fo r a n ope n i n th e wir e
betwee n th e climat e contro l uni t
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 .
Replac
e th e A/ C pressur e switch .
Chec
k fo r A/ C syste m pressure .
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Climate Contro l Uni t
Replacemen t Bul b Replacemen t
1. Remov e th e cente r ai r ven t an d cente r consol e tri m
(se e sectio n 20 ).
2 . Remov e th e bolt s an d th e climat e contro l uni t
togethe r wit h audi o unit , the n disconnec t th e con -
nectors .
CLIMAT E CONTRO L UNI T
3. Remov e th e bolts , th e screw s an d th e brackets , the n
remov e th e screw s an d th e climat e contro l uni t
fro m th e audi o unit .
BRACKE T
AUDIO UNI T
BRACKE T
CAUTION :
Before replacin g bulbs , discharg e th e stati c electrici -
t 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 previou s column) .
2 . Carefull y remov e th e self-tappin g screw s an d th e
rea r cover .
REAR COVE R
3. Remov e th e bulb(s ) wit h a flat-ti p screwdriver .
BULB
4. Instal l i n th e revers e orde r o f removal . Mak e not e o f
th e followin g items .
NOTE:
• D o 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 .CLIMAT E CONTRO L UNI T
4. Instal l i n th e revers e orde r o f removal .
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