ACURA NSX 1991 Service Repair Manual

Wipers/Washers
Windshield Wiper/Washe r Switc h Tes t
1. Remov e th e dashboar d lowe r cove r (se e pag e
23-294 ).
2 . Disconnec t th e 20- P connecto r fro m th e floo r wir e
harness .
3. Chec k fo r continuit y betwee n th e terminal s i n eac h
switc h positio n accordin g t o th e table .
WINDSHIEL DWIPER/WASHE R SWITC H20-P CONNECTO R
View fro m wir e sid e
ProCarManuals.com

Washer Replacement

1. Disconnect the hose and the 2-P connectors from

the washer motor.

2. Remove the bumper, then remove the washer

reservoir by removing the three mounting bolts.

3. Remove the washer nozzles.

4. Install the washer nozzles, and take note of the fol-

lowing:

• Clip the hose to the front harness.

• Take care not to pinch hoses during reinstalla-

tion.

• Install the clips firmly.

• After installation, adjust the washer nozzles.
Windshield Washer Motor Test

1. Disconnect the 2-P connector from the washer

motor and remove the front bumper.

2. Test the washer motor operation by connecting

power to the terminal and ground to the

terminal.

WASHER FLUID

RESERVOIR

WINDSHIELD

WASHER

MOTOR

• If the motor fails to run smoothly, replace it.

• If the motor runs smoothly but little or no washer

fluid is pumped, check for a disconnected or

blocked washer hose, or a clogged pump outlet

in the motor.ProCarManuals.com

Cruise Control

Component Location Index

SRS components are located in this area. Review the

SRS component locations, precautions, and procedures
in the SRS section (24) before performing repairs or ser-

vice.

BRAKE SWITCH

Test, page 23-308 ('93-'96) ('91-'92) INDICATOR LIGHT and
DIMMIN
G
CIRCUIT

(In tha gauge assembly)
Bulb Locations, page 23-128
('94-'96) ('91-'93)
MAIN SWITCH

Test, page 23-306 Replacement, page 23-305

SET/RESUME SWITCH

Test, page 23-307 ('93-'96) ('91-'92)
Replacement, page 23-307('93-'96) ('91-'92)
A/T GEAR POSITION

SWITCH

Test, 23-309 ('93-'96) ('91-'92) Replacement, page 23-161 ('93-'96) ('91-'92)

CABLE REEL

Test, page 23-250
Replacement, see section 24
CLUTCH SWITCH (M/T)
Test, page 23-308 ('93-'96) ('91-'92)ProCarManuals.com

ECM

See section 11

VEHICLE SPEED SENSOR (VSS)

Test, page 23-131 ('94-'96) ('91-'93)ProCarManuals.com

Cruise Control

Description

The cruise control system uses mechanically and electri-

cally operated devices to maintain vehicle speed at a

setting selected by the driver.

The ECM receives command signals from the cruise con-

trol main switch and the cruise control set/resume switch.

It receives information about operating conditions from

the brake switch, vehicle speed sensor (VSS), the clutch

switch (with manual transmission), or the A/T gear posi-

tion switch (with automatic transmission). The ECM

sends operational signals to the devices that regulate the

throttle position. The throttle position maintains the

selected vehicle speed. Essentially, the ECM compares

the actual speed of the vehicle to the selected speed.

Then, it uses the result of that comparison to open or

close the throttle.

The brake switch releases the system's control of the

throttle at the instant the driver depresses the brake

pedal. The switch sends an electronic signal to the ECM

when the brake pedal is depressed; the ECM responds

by allowing the throttle to close. The clutch switch (man-

ual transmission) or the A/T gear position switch (auto-

matic transmission) sends a disengage signal to the

ECM that also allows the throttle to close.
Operation:

The cruise control system will set and automatically

maintain any speed above 25 mph (45 km/h). To set,

make sure that the main switch is in the "ON" position.

After reaching the desired speed, press the set switch.

The ECM will receive a set signal and, in turn, will actu-

ate the throttle valve control motor. When the set switch

is depressed and the cruise control system is on, the

"cruise control" ON indicator in the gauge assembly will

light up. You can cancel the cruise control system by

pushing the main switch to "OFF". This erases the set

speed from memory. If the system is disengaged tem-

porarily by the brake switch, clutch switch, or A/T gear

position switch and vehicle speed is still above 25 mph,

press the resume switch. With the resume switch

depressed and the set memory retained, the vehicle

automatically returns to the previous set speed.

For gradual acceleration without depressing the acceler-

ator pedal, push the resume switch down and hold it

there until the desired speed is reached. This will send

an acceleration signal to the ECM. When the switch is

released, the system will be reprogrammed for the new

speed. To slow down, depress the set switch. This will

send a deceleration signal to the ECM causing the car to

coast until the desired speed is reached. When the

desired speed is reached, release the set switch. This

will reprogram the system for the new speed.ProCarManuals.com

Troubleshooting
Cruise Control

NOTE:

• The numbers in the table show the troubleshooting sequence.

• Before troubleshooting:

— Check the No. 5 (15 A) fuse in the under-dash fuse box, and the No. 29 (50 A) and No. 45 (20 A) fuses in the under-

hood fuse/relay box.

— Check that the horns sound.

— Make sure that the headlights go off.ProCarManuals.com

Control Uni t Inpu t Tes t
SRS component s ar e locate d i n thi s area . Review the
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 .
Remov e th e bulkhea d panel , the n disconnec t th e con -
nector s fro m th e EC M an d mak e th e followin g tests .
Inspec t th e connecto r an d socke t terminal s t o b e sur e
the y ar e al l makin g goo d contact .
• I f th e terminal s ar e bent , loose , o r corroded , repai r
the m as necessary , an d rechec k th e system .
• I f th e terminal s loo k OK , mak e th e followin g inpu t
test s a t th e connector .
— If an y tes t indicate s a problem , fin d an d correc t
th e cause , the n rechec k th e system .
— If al l th e inpu t test s prov e OK , th e EC M mus t b e
faulty ; replac e it .
EC M
Vie w fro mwire sid eView fro m wir e sid e
Vie w fro mwire sid e
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Cruise Control

Control Unit Input Test

View from wire side
View from

wire side
View from wire side

No. Wire
Test condition
Test: Desired result
Possible cause if result is not obtainedProCarManuals.com

Main Switc h 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 . Remov e th e dashboar d lowe r cover , an d disconnec t
th e connectors .
2 . Remov e th e dashboar d lowe r pad .
DASHBOAR D LOWE R
COVE R
DASHBOARD LOWE R
PAD
3. Remov e the tilt cover .
TILT COVE R
4. Remov e th e steerin g colum n covers .
NOTE : B e carefu l no t t o damag e th e steerin g col -
um n covers .
UPPER COVE R
LOWE R COVE R
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Cruise Control

Main Switch Replacement (cont'd)

5. Disconnect the 20-P, 4-P and 5-P connectors from

the floor wire harness.

CAUTION: Be careful not to damage the SRS wire

harness.

6. Remove the six screws, then remove the windshield

wiper-cruise control switch assembly.

5-P

CONNECTOR

WINDSHIELD

WIPER

SWITCH

CRUISE CONTROL SWITCH CONNECTOR

20-P

CONNECTOR

7. If necessary, replace the cruise control switch bulbs.

BULBS (0.91 W)

CRUISE CONTROL SWITCHProCarManuals.com