1997 ACURA NSX Service Repair Manual

Air Mi x Contro l Moto r
Replacemen t
1. Disconnec t th e heate r valv e cabl e fro m th e ai r mi x
contro l motor .
HEATE R VALV ECABLE
AIR MI X CONTRO LMOTOR
2. Remov e th e thre e screw s an d th e ai r mi x contro l
motor .
AIR MI X CONTRO L
MOTO R
3. Instal l th e ai r mi x contro l moto r i n th e revers e orde r
o f removal . The n appl y batter y voltag e (se e pag e
22-57 ), an d watc h th e doo r move .
• Mak e sur e tha t th e ai r mi x doo r move s smoothl y
without binding .
• Mak e sur e th e moto r doesn' t pul l th e ai r mi x
doo r to o far . 4
. I f necessary , t o adjus t th e heate r valv e cable :
• Se t th e ai r mi x contro l moto r a t COO L positio n
(se e pag e 22-57 ) wit h th e cabl e disconnecte d a t
th e valve .
• Hol d th e en d o f th e cabl e housin g agains t th e
sto p o n th e cable . The n sna p th e clam p dow n
ove r th e housing .
• Afte r adjustin g th e cable , mak e sur e tha t th e ai r
mi x contro l moto r stil l move s smoothl y withou t
binding.
STOP
CLAM P
HEATE R VALV ECABLE
AIR MI X CONTRO L
MOTO R
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Test
1. Connec t batter y powe r t o th e No . 1 termina l o f th e
ai r mi x contro l motor , the n connec t groun d t o th e
No. 2 terminal ; th e ai r mi x contro l moto r shoul d
run, an d sto p a t 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 , an d chec k th e ai r mi x contro l linkag e an d
door s fo r smoot h movement . I f th e ai r mi x contro l
linkag e an d door s mov e smoothly , replac e th e ai r
mi x contro l motor .
2 . Measur e resistanc e betwee n th e No . 3 termina l an d
No. 5 terminal ; i t shoul d b e approx . 1 0
3 . Measur e resistanc e betwee n th e No . 3 termina l an d
No. 4 terminal ; i f shoul d b e approx . 0. 6 a t COO L
and approx . 9. 4 a t HOT .
Mode Contro l Moto r
Replacemen t
1. Remov e th e thre e screw s an d mod e contro l motor .
MODE CONTRO L
MOTO R
2. Instal l th e mod e contro l moto r i n th e revers e orde r
of removal . The n appl y batter y voltag e (se e pag e
22-58 ), an d watc h th e door s move .
• Mak e sur e tha t th e HEA T an d DE F door s move s
smoothl y withou t binding .
• Mak e sur e th e moto r doesn' t pul l th e HEA T an d
DE F door s to o far .
Air Mix Control Motor
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Mode Control Motor

Test

1. Disconnect the mode control motor connector, turn

the ignition switch ON (II), and move the blower

switch to the middle setting.

2. Connect battery power to the No. 1 terminal of the

mode control motor, then connect ground to the No.

2 terminal. The mode control motor should run, and

stop at VENT.

If it doesn't, reverse the connections; the mode

control motor should run, and stop at DEF.

NOTE: If the mode control motor does not run,

remove it, and check the mode control linkage and

doors for smooth movement. If the mode control

linkage and doors move smoothly, replace the

mode control motor.
3. Plug the connector back into the motor. Operate

the mode switch on the climate control unit to each

mode. Verify that the mode control motor has mov-

ed to the selected position by checking the air flow

for the mode selected.

NOTE: If the motor did not move, turn the ignition

switch OFF, and disconnect the mode control mo-

tor connector. Turn the ignition switch ON (II), then

connect battery power to No. 1 and No. 2 terminals

as shown in step 2. Power the mode control motor

to move the doors to the mode selected.

4. Disconnect the mode control motor connector at

each mode selected and check for continuity bet-

ween the motor terminals according to the table

below.

5. Replace the mode control motor if there is no con-

tinuity for any one mode selected.ProCarManuals.com

Recirculation Contro l Moto r
Replacemen t
1. Remov e th e blowe r uni t (se e pag e 22-67 )
2 . Remov e th e thre e screw s an d th e recirculatio n con -
tro l moto r cove r fro m th e blowe r unit .
RECIRCULATIO NCONTROL MOTO R COVE R
3. Remov e th e thre e screw s an d th e recirculatio n con -
trol motor .
RECIRCULATIO NCONTROL MOTO R
4. Instal l th e recirculatio n contro l moto r i n th e revers e
orde r o f removal . The n appl y batter y voltage , an d
watc h th e doo r movement .
• Mak e sur e tha t th e recirculatio n doo r move s
smoothl y withou t binding .
• Mak e sur e th e moto r doesn' t pul l th e doo r to o
far .
Tes t
1. Connec t batter y powe r t o th e No . 1 termina l of the
recirculatio n contro l motor , the n connec t groun d t o
th e No . 2 terminal ; th e recirculatio n contro l moto r
shoul d run , an d sto p a t REC .
I f i t doesn't , revers e th e connections ; th e recircula -
tion contro l moto r shoul d run , an d sto p a t FRE .
NOTE : I f th e recirculatio n contro l moto r doe s no t
run , remov e it , an d chec k th e recirculatio n contro l
linkag e an d doo r fo r smoot h movement . I f th e recir -
culatio n contro l linkag e an d doo r mov e smoothly ,
replac e th e recirculatio n contro l motor .
2 . Chec k fo r continuit y betwee n th e terminal s o f th e
recirculatio n contro l moto r accordin g t o th e table .
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Vent Door Control Motor

Replacement —————————

1. Remove the three screws and vent door control

motor.

VENT DOOR CONTROL

MOTOR

2. Install the vent door control motor in the reverse

order of removal. Then apply battery voltage, and

watch the door move.

• Make sure that the vent door moves smoothly

without binding.

• Make sure the motor doesn't pull the vent door

too
far.
Test

1. Connect battery power to the No. 1 terminal of the

vent door control motor, then connect ground to the

No. 2 terminal; the vent door control motor should

run, and stop at CLOSE.

If it doesn't, reverse the connections; the vent door

control motor should run, and stop at OPEN.

NOTE: If the vent door control motor does not run,

remove it, and check the vent door control linkage

and door for smooth movement. If the vent door

control linkage and door move smoothly, replace

the vent door control motor.

2. Measure resistance between the No. 3 terminal and

No. 5 terminal, it should be approx. 10

3. Measure resistance between the No. 3 terminal and

No. 4 terminal, it should be approx. 0.6 at OPEN

and approx. 9.4 at CLOSE.ProCarManuals.com

In-car Temperatur e Senso r
Remova l
The in-ca r temperatur e senso r assembl y include s a
smal l fa n (aspirato r fan ) t o dra w ai r pas t th e senso r (se e
pag e 22-66 ).
SR S component s ar e locate d in thi s area . Revie w th e SR S
componen t locations , precautions , an d procedure s in th e
SR S sectio n 24 befor e performin g repair s o r service .
1 . Remov e th e cente r consol e pane l (se e pag e 22-54 ).
2 . Remov e th e tw o screw s an d th e in-ca r temperatur e
senso r fro m th e unde r sid e o f th e cente r consol e
panel . B e carefu l no t t o damag e th e cente r consol e
panel.
IN-CA R TEMPERATUR ESENSOR
UNDER SID E O F CENTE R
CONSOL E PANE L
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
specification s show n i n th e followin g graph : I t shoul d
be withi n specification .
CAUTION: Th e senso r use s a thermisto r whic h ca n
b e damage d if hig h curren t i s applie d to it durin g test -
ing . Therefore , us e a circui t teste r tha t put s ou t a
measurin g curren t o f 1 m A o r less .
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Outside Air Temperature Sensor

Removal

Remove the screw, disconnect the connector, and

remove the outside air temperature sensor. Be careful

not to damage the front grille and front bumper.

OUTSIDE AIR

TEMPERATURE

SENSOR
Test

Compare the resistance reading between the terminals

of the outside air temperature sensor with specifica-

tions shown in the following graph: It should be within

specification.

NOTE: Dip the sensor in ice water, and measure the

resistance. Then pour hot water on the sensor, and

check for change in resistance.

CAUTION: The sensor uses a thermistor which

can be damaged if high current is applied to it dur-

ing testing. Therefore, use a circuit tester that puts

out a measuring current of 1 mA or less.ProCarManuals.com

Sunlight Sensor

Removal

Protect the dashboard with a shop towel, then with a

small screwdriver, carefully pry the sunlight sensor out

of the dashboard and disconnect its connector.

SUNLIGHT

SENSOR
Test

Measure the voltage between the terminals with the sen-

sor out of direct sunlight.

• With the connector connected (probe the back of it):

1.4 ± 0.2 V

• With the connector disconnected: 0.1 - 0.2 VProCarManuals.com