1995 ACURA TL Service Repair Manual

Troubleshooting

Radiator Fan Control Module Input Tests

NOTE: Perform the following tests with the radiator fan control module 8P connector connected, the ignition switch ON (II),

and the A/C switch OFF. If you find the cause of a problem, correct it before you continue.

RADIATOR FAN CONTROL MODULE 8P CONNECTOR

WIRE SIDE OF FEMALE TERMINALS

Terminal

No.

4

6

7

2

3

1

8

5
Wire

color

BLK

WHT/GRN

BLK/YEL

YEL/BLK

YEL/WHT

YEL

LT

GRN/YEL

WHT/GRN
Test condition

Check for voltage to body

ground.

Check for battery voltage:

Check for battery voltage:

Ignition switch - ON (II)

Check for battery voltage:

Ignition switch - ON (II)

Check for battery voltage:

Ignition switch - ON (II)

Check for battery voltage:

Ignition switch - ON (II)

Connect to body ground:

Ignition switch - ON (II)

Check for voltage.
Desired results

There should be less

than one volt.

There should be battery

voltage.

Condenser fan and radia-

tor fan should come on.

Approx. 11 V (engine

coolant temperature

below 207°F [97°C])
Corrective action if desired results are

not obtained

Repair open to body ground.

Check No. 39 (10 A) fuse in the under-

hood fuse/relay box; if OK, repair open

in the WHT/GRN wire.

Check No. 4* fuse in the under-dash

fuse/relay box; if OK, repair open in the

BLK/YEL wire.

Check No. 8 (7.5 A) fuse in the under-

dash fuse/relay box; if OK, repair open in

the YEL/BLK wire.

Replace the radiator fan control module.

Before you connect the new radiator fan

control module, disconnect both fan

relays. Check for continuity between the

YEL/WHT (or YEL) wire and ground, using

the 20 k scale on your ohmmeter. There

should be no continuity. If there is conti-

nuity, the new radiator fan control mod-

ule will be damaged when you connect it.

Check for an open in the LT GRN/YEL

wire between the radiator fan control

module and the condenser fan relay or

the radiator fan relay. If OK, check for an

open in the YEL/WHT wire between the

radiator fan control module and the con-

denser fan relay, or the YEL wire between

the radiator fan control module and the

radiator fan relay. If OK, test the con-

denser fan relay or the radiator fan relay.

Faulty engine coolant temperature (ECT)

switch B, short to body ground, or faulty

radiator fan control module.

* No.4 (15 A): '95 and '96 models

No.4 (20 A): '97 and '98 modelsProCarManuals.com

Climate Contro l Uni t
Replacemen t
Bulb Replacemen t
1. Remov e th e dashboar d cente r pane l togethe r wit h
th e climat e contro l unit , the n disconnec t th e con -
nectors .
CAUTION :
B e carefu l no t t o damag e th e dashboar d cente r
pane l an d th e dashboard .
D o no t pul l betwee n th e clips : Otherwise , th e
pane l ma y break .
DASHBOAR D CENTE R PANE L
2. Remov e th e fou r self-tappin g screw s an d th e cli -
mat e contro l unit .
CLIMAT E CONTRO L UNI T
3. Instal l i n th e revers e orde r o f removal . CAUTION
:
Befor e replacin g bulbs , 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 meta l part s o f th e body .
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 col -
umn) .
2. Carefull y remov e th e fou r 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 .
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:
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 i n th e system .
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Air Mi x Contro l Moto r
Replacemen t
1. Tur n th e ignitio n switc h O N (II) , the n se t th e temper -
atur e contro l dia l o n MA X COOL . Tur n th e ignitio n
switc h OFF .
2 . Remov e th e glov e bo x (se e sectio n 20 ).
3 . Remov e th e wir e harnes s clip , an d disconnec t th e
5P connecto r fro m th e ai r mi x contro l motor .
4 . Unloc k th e clip s fro m th e ai r mi x contro l rods , the n
remov e th e thre e self-tappin g screw s an d th e ai r
mi x contro l motor .
AIR MI X CONTRO L MOTO R
CLIP
CLIP
WIR E HARNES S CLI P
ROD S
5. Remov e th e ro d fro m th e ai r mi x contro l motor .
6 . 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 .
Test
1. Disconnec t th e 5 P connecto r fro m th e ai r mi x con -
trol 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
at HOT . I f i t doesn't , revers e th e connections ; th e ai r
mi x contro l moto r shoul d run , an d sto p a t COOL .
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 .
3 . Measur e th e resistanc e betwee n th e No . 2 an d No . 3
terminals . I t shoul d b e approximatel y 6 k ± 20% .
4 . Measur e th e resistanc e betwee n th e No . 3 an d No . 4
terminals . I t shoul d b e approx . 1. 2 k ± 20% at MA X
HOT an d approximatel y 4. 8 k ± 20% at MA X COO L
AIR MI X CONTRO L MOTO R
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Mode Contro l Moto r
Replacemen t
1. Tur n th e ignitio n switc h O N (II) , the n se t th e mod e
contro l switc h o n VENT . Tur n th e ignitio n switc h
OFF.
2. Remov e th e dashboar d (se e sectio n 20 ).
3 . Disconnec t th e 7 P connecto r fro m th e mod e contro l
motor.
4. Unhoo k th e cli p fro m th e mod e contro l rod , the n
remov e th e thre e self-tappin g screws , th e mod e
contro l moto r an d th e flang e collars .
CLIP
RO D
FLANG E COLLAR S
MODE CONTRO L MOTO R
5. Remov e th e ro d fro m th e mod e contro l motor .
6 . 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 .
Test
1. Disconnec t th e 7 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 terminal , an d
groun d th e No . 7 terminal .
CAUTION : Neve r connec t th e batter y in th e oppo -
sit e direction .
3.
4 .
Usin g a jumpe r wire , connec t th e No . 7 termina l
individuall y t o th e No . 2 , 3 , 4 , 5 an d 6 terminal s i n
tha t order . Eac h tim e th e connectio n i s made , th e
mod e contro l moto r shoul d ru n smoothl y an d stop .
NOTE : I f th e mod e contro l moto r doe s no t ru n whe n
jumpin g th e firs t terminal , jum p tha t termina l agai n
afte r jumpin g th e othe r terminals .
Th e mod e contro l moto r i s O K if i t run s whe n jump -
in g th e firs t termina l again .
MODE CONTRO L MOTO R
If th e mod e contro l moto r doe s no t ru n i n ste p 2 ,
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 .
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Recirculation Contro l Moto r
Replacemen t
1. Remov e th e wir e harnes s clips , th e thre e self-tap -
pin g screw s an d th e pip e cover .
PIPE COVE RWIRE HARNES S CLIP S
2. Disconnec t th e 4 P connecto r fro m th e recirculatio n
contro l motor .
3 . Remov e th e thre e self-tappin g screws , th e recircula -
tio n contro l moto r an d th e flang e collar .
RECIRCULATIO NCONTROL MOTO R
FLANGE COLLA R
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
ground the 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 in th e oppo -
sit e direction .
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
or RECIRCULATE .
NOTE: Don' t cycl e th e recirculatio n contro l moto r
for a lon g time .
RECIRCULATIO NCONTROL MOTO R
4.If th e recirculatio n contro l moto r doe s no t ru n i n
ste p 1 , 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 contro l
motor.
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In-car Temperatur e Senso r
Replacemen t
1. Remove the dashboard center panel (see page
22-49).
2 . Remov e th e in-ca r temperatur e senso r fro m th e
dashboard , the n disconnec t th e 2 P connecto r an d
th e ai r hose .
AIR HOS E
IN-CA R TEMPERATUR E SENSO R
3. 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
th e specification s show n i n followin g graph ; resistanc e
shoul d 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
TEMPERATUR E
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Outside Ai r Temperatur e Senso r
Replacemen t
1. Disconnec t th e 2 P connecto r fro m th e outsid e ai r
temperatur e sensor .
2 . Releas e th e lock , an d remov e th e outsid e ai r tem -
peratur e sensor .
OUTSID E AI R TEMPERATUR E SENSO R
LOCK
3. 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 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 .
OUTSIDE AI R TEMPERATUR E SENSO R
TEMPERATUR E
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Sunlight Sensor

Replacement

1. Remove the sunlight sensor from the left tweeter

speaker grille, and disconnect the 2P connector.

NOTE: Be careful not to damage the left tweeter

speaker grille.

SUNLIGHT SENSOR

2. Install in the reverse order of removal.
Test

Turn the ignition switch ON (II). Measure the voltage

between the terminals with the (+) probe on the No. 1

terminal and the (-) probe on the No. 2 terminal with the

2P connector connected. Voltage should be;

3.7 ± 0.2 V or more with the sensor out of direct sun-

light.

3.6 ± 0.2 V or less with the sensor in direct sunlight.

NOTE: The voltage will not change under the light of a

flashlight or a fluorescent lamp.

SUNLIGHT SENSORProCarManuals.com