1997 ACURA NSX turn signal

Construction and Function (cont'd)
System Description

Fail-Safe Function

If the control unit detects an abnormality, it shuts the

traction control system off and causes the TCS indicator

light to come on. However if the abnormality is detected

while the TCS is activated, the control unit first estab-

lishes the appropriate wheel spin velocity, then shuts

the system down, thus preventing excessive wheel spin.

Self-Diagnosis Function

If the control unit detects an abnormality, it records a

Diagnostic Trouble Code (DTC) which can be used to

diagnose the problem. The DTC is shown at the TCS

indicator light when the Service Check connector termi-

nals are connected with the SCS service connector.

Steering Angle Detection

Steering angle is detected by the steering angle sensor,

located on the steering column. The sensor uses two

magneto-resistor (MR) elements to determine steering

angle and direction of rotation. When the driver turns

the steering wheel, a magnet in the steering shaft gener-

ates waves in the "MR" elements. These waves are

amplified and converted into signals which the control

unit can interpret as angle and direction of turn.

Vehicle Speed Detection

Wheel rotation speed is detected by the wheel sensors,

located at each wheel. The signals are sent to the con-

trol unit, which compares each wheel's speed and deter-

mines whether traction control is required.ProCarManuals.com

Front Bumper

Replacement

1. Loosen the mounting screw, then pull the right and left front turn signal lights out and disconnect the connectors.

2. Remove the skirt covers, then remove the bumper mounting bolts on each side, and lower skirt mounting bolt.

3. Lower the inner fender, then remove the bumper mounting nuts and the skirt mounting bolts from inside the front

fender on each side.

4. Lift and remove the front bumper.

NOTE:

• Disconnect the washer hose, horn connecters, and ambient sensor connector.

• An assistant is helpful when removing the front bumper.

• Take care not to scratch the front bumper.

5. Installation is the reverse of the removal procedure.

NOTE: Insert the bumper bracket hooks into the bumper bracket holes.ProCarManuals.com

Description

Fan Control Unit

The fan control unit performs calculations based on signals from the radiator fan control sensor. It them controls the

operation of radiator fan speed (High-Low), engine compartment fan, condenser fan and A/C compressor.

When engine coolant temperature is above 183°F

(84°C), the fan control unit turns Tr1 ON and

radiator fan runs at low speed.

When engine coolant temperature is above 194°F

(90°C), the fan control unit turns Tr2 ON, and

radiator fan runs at high speed and engine

compartment fan comes on.

When engine coolant temperature is above 266°F

(130°C), the fan control unit turns Tr3 OFF, and

stops the condenser fan. Then it turns Tr4 OFF,

and stops the compressor.

IG2

RADIATOR FAN (Low)

RADIATOR

FAN CONTROL

SENSOR
RADIATOR FAN (High)

ENGINE COMPARTMENT

FAN

CONDENSER FAN

(Right and Left)

ECM
(ACS)

A/C

TRIPLE

PRESSURE

SWITCH

GND
A/C SWITCHProCarManuals.com

Relay and Control Unit Locations

Dashboard

IMMOBILIZER CONTROL UNIT
CLIMATE CONTROL UNIT

TURN SIGNAL/HAZARD

RELAY

DASHBOARD

LOWER COVER

INTEGRATED

CONTROL UNIT

UNDER-DASH FUSE BOXProCarManuals.com

Gauge Assembly

Bulb Locations

GAUGE LIGHTS (1.4 Wx 2)

SRS INDICATOR LIGHT (1.4 W)

RIGHT TURN SIGNAL INDICATOR LIGHT 11.4 W)

EPS INDICATOR LIGHT (1.4 W)

BRAKE SYSTEM LIGHT (1.4 W)

SEAT BELT REMINDER LIGHT (1.4 W)

IMMOBILIZER INDICATOR

LIGHT (1.4 W)

LOW FUEL INDICATOR

LIGHT (1.4 W)

GAUGE LIGHT

(1.4
W)
TCS INDICATOR LIGHT (1.96 W)

LEFT TURN SIGNAL INDICATOR LIGHT (1.4 W)

ABS

INDICATOR LIGHT (1.4 W)

CHARGING SYSTEM LIGHT (1.4 W)

MALFUNCTION

INDICATOR

LAMP (MIL)

(1.4
W)

CRUISE INDICATOR LIGHT

(1.96
W)
LOW OIL PRESSURE

INDICATOR

LIGHT (1.4 W)

GAUGE LIGHT

.4W)

GAUGE LIGHT

(3.0
W)
GAUGE LIGHT

GAUGE LIGHT HIGH BEAM INDICATOR (3.0 W)

(3.0 W) LIGHT (1.4 W)ProCarManuals.com

Switches

The lighting system is controlled by five switches and the turn signal cancel unit.

HEADLIGHT SWITCH
HAZARD WARNING SWITCH

TURN SIGNAL and DIMMER SWITCH

TURN SIGNAL CANCEL SWITCH
TURN SIGNAL CANCEL UNITProCarManuals.com

5. Disconnect the 18P and 10P connectors.

CAUTION: Be careful not to damage the SRS wire

harness.

6. Remove the six screws, then remove the headlight-

turn signal switch assembly.

HEADLIGHT SWITCH

10P CONNECTOR

18PXJONNECTOR

TURN SIGNAL SWITCH

7. If necessary, remove the turn signal cancel unit and

cancel switch.

TURN SIGNAL

CANCEL UNIT
TURN SIGNAL

CANCEL SWITCH
8. If necessary, remove the headlight switch bulb.

HEADLIGHT SWITCH

BULB (0.91 W)ProCarManuals.com

Front Turn Signal/Front

Parking Lights

Replacement

1. Remove the screw, and pull the light assembly out

of the front bumper.

SCREW

2. Disconnect the 2P connectors from the bulb sock-

ets.

2P CONNECTORS

FRONT PARKING LIGHT

BULB (5W)

BULB

SOCKET

FRONT TURN SIGNAL

LIGHT BULB (45CP)

HOUSING

3. Turn the bulb sockets 45° counterclockwise to re-

move them from the housing.
Front Side Marker

Lights

Replacement

1. Carefully pry the front side marker light out of the

front fender. Be careful not to damage the front side

marker light or the front fender.

PROTECTIVE CLOTH

FRONT SIDE MARKER LIGHT

2. Disconnect the 2P connector from the front side

marker light.

2P CONNECTOR

HOUSING

3. Turn the bulb socket 45° counterclockwise to re-

move it from the housing.
BULB (3CP)ProCarManuals.com