1991 ACURA NSX relay

Component Location Index
INDICATOR LIGHT
ACTIVATION LIGHT INDICATOR LIGHT
UNDER-HOOD
FUSE/RELAY BOX
ABS
CONTROL UNIT
STEERING

ANGLE SENSOR
(page 19-138)
TCS SWITCH(page 19-137)
UNDER-DASH FUSE BOX

A/T GEAR POSITION
SWITCH
FAIL-SAFE RELAY

(page 19-137)
ENGINE

COMPARTMENT

FUSE/RELAY BOX

TRANSMISSON

CONTROL

MODULE (TCM)
ENGINE
GROUND
TCS CONTROL
UNIT
ENGINE CONTROL
MODULE (ECM)
ACCELERATOR

PEDAL

ANGLE
SENSOR
THROTTLE

ACTUATOR

THROTTLE
POSITION (TP)

SENSORProCarManuals.com

The TCS control unit has three memory registers. When a problem occurs, the control unit stores the Diagnostic Trou-
ble Code (DTC) in the first memory register. If another problem occurs, or the same problem occurs again, the control
unit moves the first code to the next memory register and stores the second code in the first register. If there's a thirdproblem occurrence, the two existing code are moved up one register and the third code is stored in the first register.
If problems continue to occur, the oldest code is moved out of the last register and lost, and the most recent code is
stored in the first register. The TCS indicator light will not come on again after the engine starts unless another problem occurence is detected.

However, there will still be a code stored in the control unit's memory.

After the repair is completed, disconnect the jumper wire from the Service Check connector and remove the ABS 2.3
fuse (20 A) from the main relay box for at least 3 seconds to erase the control unit's memory. The control unit's memory is erased if the connector is disconnected from the control unit, or if the control unit is
removed from the car.

NOTE:

a: 2.0
sec.
c: 1.2
sec.
e: 0.3
sec.
g: 3.8
sec.

b: 0.5
sec.
d: 1.0
sec.
f: 2.5
sec.

Ignition

switch on

LIGHT

ON

LIGHT

OFF
First inspection Second inspection Third inspection First inspection

DTC 2-1 DTC 2 DTC 4-2 DTC 2-1

Engine start2nd cycle
ProCarManuals.com

There should be continuity between the A and B termi-

nals when the battery is connected to the C and D ter-

minals.

There should be no continuity between the A and B ter-

minals when the battery is disconnected.
Fail-Safe Relay Test
Electronic Components

TCS Switch Test

There should be continuity between the D and E termi-

nals when the switch is pushed and there should be no

continuity when the switch is relesed.

Indicator light

Switch

LightProCarManuals.com

Relay and Control Unit Locations

Dashboard

CLIMATE CONTROL UNIT
TURN SIGNAL/HAZARD

RELAY

UNDER-DASH FUSE BOX
INTEGRATED

CONTROL UNIT
DASHBOARD

LOWER COVER
STARTER CUT RELAY

Wire colors: BLK/WHT

BLK/WHT, BLU/GRN,

and BLK/BLUProCarManuals.com

Dashboard, Door and Floor

DRIVER'S DOOR PANEL
POWER WINDOW
CONTROL UNIT
CIGARETTE LIGHTER

RELAY
SRS UNIT
FOOT WELL BASS SPEAKER RIGHT FRONT FLOOR

PANEL
EPS POWER UNIT

(Behind foot well

bass speaker)
SECURITY CONTROL UNIT

DAYTIME RUNNING

LIGHTS CONTROL
UNIT (Canada)

ABS CONTROL UNIT

CRUISE CONTROL UNIT
EPS CONTROL UNIT
(A/T)

POWER DOOR LOCK
CONTROL UNIT
Wire colors: YEL/RED, BLU/GRN, BRN/YEL, and BLKProCarManuals.com

Relay and Control Unit Locations
Rear Bulkhead
FAN CONTROL

UNIT

ECM

TCS FAIL-SAFE

RELAY

Wire colors: YEL,
and LT GRN/BLK TRANSMISSION CONTROL
MODULE (TCM)
DASH LIGHTS
BRIGHTNESS
CONTROL UNIT
TCS CONTROL UNIT

GRN/RED, RED/BLK,ProCarManuals.com

RETRACTABLE HEADLIGHT

CONTROL UNIT
INTERLOCK CONTROL

UNIT (A/T)

FUEL PUMP RELAY

Wire colors: YEL, RED,

BLK/YEL, and BLK/REDProCarManuals.com

Relay and Control Unit Locations

Engine Compartment

REAR WINDOW DEFOGGER

RELAY

ENGINE COMPARTMENT

FUSE/RELAY BOX
ENGINE COMPARTMENT

FAN RELAY

Wire colors: YEL/BLU,

BLK/YEL, WHT/RED,

and WHT/BLU

IGNITION CONTROL

MODULE (ICM)ProCarManuals.com