1991 ACURA NSX Service Repair Manual

Troubleshooting

NOTE: The numbers in the table show the troubleshooting sequence.

Intermittent Wiper Relay Test

1. Remove the wiper intermittent relay from the

under-hood relay box B.

2. There should be continuity between the A and C

terminals when power and ground are connected to

the E and F terminals.

There should be continuity between the B and C

terminals when power is disconnected.ProCarManuals.com

Wipers/Washers

Windshield Wiper MotorReplacement
1. Open the hood and remove the cap nuts and the wiper arms. Don't let the wiper arms hit the hood.
2. Remove the windshield lower molding, hood seal
and air scoop by prying off the trim clips and

removing the screws (see page 23-293):
3. Disconnect the 5-P connector from the wiper motor assembly, then remove the two mounting
bolts and the wiper linkage assembly.

WIPER LINKAGE ASSEMBLY

5-P CONNECTOR

4. Remove the three mounting bolts and nut from the wiper linkage assembly and remove the wiper

motor.

NUT
18 N·m(1.8 kg·m, 13 lb-ft)
MOUNTING

BOLTS

8 N·m
(0.8 kg-m,
5.8 Ib-ft)

WIPER LINKAGE

ASSEMBLY

WIPER MOTOR

5. Install the wiper motor assembly in the reverse ord- er of removal. Windshield Wiper/Washer Switch

Replacement

CAUTION:
All SRS wiring harnesses are covered with yellow
outer insulation. Before disconnecting any part of the SRS wire
harness, install the short connectors (see page

24-10).
Replace the entire affected SRS harness assembly if

it has an open circuit or damaged wiring.

SRS MAIN

HARNESS
1, Remove the dashboard lower cover and disconnect the connectors from the floor wire harness.

CONNECTORS
DASHBOARD LOWER

COVERProCarManuals.com

2. Disconnect the 18-P connector from the floor wire

harness.

CAUTION: Be careful not to damage the SRS

wires.

WINDSHIELD WIPER/WASHER

SWITCH

HAZARD

WARNING SWITCH

18-P

CONNECTOR

3.
Remove
the
tilt
cover.

TILT COVER
4. Carefully remove the steering column lower cover

and upper cover.

UPPER COVER

LOWER COVER

5. Remove the four screws, then remove the hazard

warning switch and windshield wiper/washer

switch assembly.

WINDSHIELD WIPER/WASHER

SWITCH
HAZARD

WARNING

SWITCHProCarManuals.com

Wipers/Washers

Windshield Wiper/Washer Switch Test
1. Remove the dashboard lower cover (see page 23-126).
2. Disconnect the 18-P connector from the floor wire harness.
3. Check for continuity between the terminals in each
switch position according to the table.

18-P CONNECTOR
WINDSHIELD
WIPER/WASHER SWITCH
View from wire sideProCarManuals.com

Cruise Control

Component Location Index

CAUTION:
All SRS wiring harnesses are covered with yellow

outer Insulation.
Before disconnecting any part of the SRS wire

hamess Install the short connectors (see page

24-10).
Replace the entire affected SRS harness assembly if

it has an open circuit or damaged wiring.

BRAKE SWITCH

Test, page 23-308 MAIN SWITCH
Test, page 23-299 Replacement, page 23-298
INDICATOR LIGHT and
DIMMING CIRCUIT
(In the gauge assembly)
Bulb Locations, page 23-128

CLUTCH SWITCH (M/T)
Teat, page 23-308

CABLE REEL

Test, page 23-250

Replacement
,
page 23-344

A/T GEAR POSITION
SWITCH

Test, 23-309

Replacement, page 23-161

CRUISE CONTROL UNIT

Inpu
t
Test, page 23-296

SRS
MAIN

HARNESS

SET/RESUME SWITCH

Test
,
page 23-307Replacement
,
page 23-307
ProCarManuals.com

ACTUATOR ASSEMBLY

Test, page 23-302

Cable Adjustment,

page 23-303

VEHICLE SPEED SENSOR (VSS)
Test, page 23-129ProCarManuals.com

Cruise Control

Description

The cruise control system uses mechanically and elec-

trically operated devices to maintain vehicle speed at a

setting selected by the driver.

The cruise control unit receives command signals from

the cruise control main switch and the cruise control

set/resume switch. It receives information about

operating conditions from the brake switch, ECM, vehi-

cle speed sensor (VSS), the clutch switch (with manual

transmission), or the A/T gear position switch (with

automatic transmission). The cruise control unit sends

operational signals to the devices that regulate the

throttle position. The throttle position maintains the

selected vehicle speed. Essentially, the control unit

compares the actual speed of the vehicle to the

selected speed. Then, the control unit 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 con-

trol unit when the brake pedal is depressed; the control

unit responds by allowing the throttle to close. The

clutch switch (manual transmission) or the A/T gear

position switch (automatic transmission) sends a

disengage signal to the control unit that also allows the

throttle to close.
Operation:

The cruise control system will set and automatically

maintain any speed above 30 mph (45 kph). To set,

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

After reaching the desired speed, press the set switch.

The cruise control unit will receive a set signal and, in

turn, will actuate the cruise control actuator. 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

removes power to the control unit and 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 30 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 ac-

celerator pedal, push the resume switch down and hold

it there until the desired speed is reached. This will send

an acceleration signal to the control unit. 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 control unit

causing the car to coast until the desired speed is reach-

ed. When the desired speed is reached, release the set

switch. This will reprogram the system for the new

speed.ProCarManuals.com

The electrically operated actuator controls the throttle position the same as a vacuum operated actuator. The magnetic

clutch is part of the safety system, controls acceleration and deceleration.

OUTPUT LINK

MOTOR

TO ACCELERATOR PEDAL

DECELERATION

ACCELERATION

ACTUATOR CABLE

Acceleration:

The motor actuates; then power is transmitted to the magnetic clutch by the transmission gear and the worm wheel. The

magnetic clutch is rotated and magnetized. The magnetic clutch attracts the clutch plate, then power is transmitted to

the output link by the gear directly connected to the clutch plate and the output gear. The output link rotates clockwise,

then the actuator cable opens the throttle, and the car accelerates.

Deceleration:

The motor rotates in the reverse direction of acceleration; then in the same way, the power is transmitted to the output

link. The output link rotates counterclockwise, then the actuator cable closes the throttle, and the car decelerates.

LIMIT SWITCH

RETURN SPRING

MOTOR

TRANSMISSION GEAR

OUTPUT GEAR

ACTUATOR CABLE

TO ACCELERATOR PEDAL
OUTPUT LINK
DAMPER SPRING
CLUTCH PLATE
CLUTCH PIN
WORM WHEEL
MAGNETIC CLUTCHProCarManuals.com