1991 ACURA NSX fuse box

UNDER HOOD FUSE/RELAY BOX
DIMME
R
RELAY


Test, page 23-189
UNDER-HOOD RELAY BOX A

TAILLKSHT RELAY

Test, page 23-190

HEADLIGHT RELAY

Test, page 23-189
RIGHT HEADLIGHT

RETRACTOR RELAY

Test, page 23-190
RIGHT HEADLIGHT

RETRACTOR MOTOR

Test, page 23-188

Replacement, page
23-186

RIGHT DAYTIME RUNNING
LIGHT (Canada)
Replacement, page
23-194

HEADLIGHTS
Ajustment, page 23-192

Replacement, page 23-193
LEFT DAYTIME RUNNING LIGHT (Canada)

Replacement
,
page 23-194

LEFT HEADLIGHT

RETRACTOR MOTOR

Test, page 23-188
Replacement, page 23-186 LEFT HEADLIGHT

RETRACTOR RELAY

Test
,
page 23-190

LEFT HEADLIGHT

RETRACTOR CUT RELAY

Test, page 23-190
RIGHT HEADLIGHT

RETRACTOR CUT RELAY

Test, page 23-190ProCarManuals.com

Power Door Locks
Component Location Index
UNDER-HOOD FUSE/BELAY BOX
Located at right side offront compartment

IGNITION KEY SWITCH

Test, page 23-167

DRIVER'S DOOR LOCK SWITCH

Test
,
page 23-260

DRIVER'S DOOR LOCK
ACTUATOR ASSEMBLY

Test
,
page 23-258Replacement
,
section 20

DRIVER'S DOOR SWITCH

Test, page 23-198

PASSENGERS'S DOOR LOCK
ACTUATOR ASSEMBLY

Test
,
page 23-259Replacement
,
section 20

PASSENGER'S DOOR SWITCH

Test
,
page 23-198

PASSENGER'S DOOR LOCK

SWITCH

Test
,
page 23-260

POWER DOOR LOCK
CONTROL UNIT

Inpu
t
Test,
ProCarManuals.com

Rear Window Defogger
Component Location Index

CAUTION:
Al
l
SRS wiring harnesses are covered with yellow
outer insulation.
Befor
e
disconnecting any part of the SRS wire
harness

,
install the short connectors (see page

24-10).

Replac
e
the entire affected SRS harness assembly if

it
has an open circuit or damaged wiring.
REA
R
WINDOW DEFOGGERTIME
R
CIRCUIT(I
n
the integrated control unit)

SRS MAIN

HARNESS

REA
R
WINDOWDEFOGGE
R
SWITCHRemoval
,
page 23-277


Test, page 23-279

REAR WINDOW DEFOGGER

Functio
n
Test, page 23-288

UNDER-DASH FUSE BOX

REA
R
WINDOWOEFOGGE
R
REALV


Test, page 23-278

ENGIN
E
COMPARTMENT


FUSE/RELAY BOX

Description
The rear window defogger is controlled by the integrated control unit. When the defogger switch in the combination
switch is pushed, it sends a signal to the defogger timer in the integrated control unit and the defogger stays on for 25

(40 minutes for Canada models) minutes or until the ignition switch is turned off.
The indicator light in the switch shows when the defogger is on.ProCarManuals.com

Rear Window Defogger
Switch Light Bulb Replacement
1. Remove the steering column lower and upper covers.
2. Remove the four screws from the combination
switch.

3. Remove the rear window defogger switch (see previous page).
4. Remove the rear window defogger switch bulbs.

BULBS (0.91 W)
REAR WINDOW
DEFOGGER SWITCH Relay Test
1. Remove the defogger relay in the engine compart- ment fuse/relay box.
2. There should be continuity between the C and D terminals.
3. There should be continuity between the A and B terminals when power and ground are connected to

the C and D terminals.

There should be no continuity when power isdisconnected.ProCarManuals.com

Troubleshooting

NOTE:

The numbers in the table show the troubleshooting sequence.

Before troubleshooting.

Check the No. 5 (10 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.

Check that the tachometer works properly.ProCarManuals.com

Idle Control System

Troubleshooting Flowchart
Air Conditioning Signal
This signals the PGM-FI ECU when there is a demand for cooling from the air conditioning system.

Inspection of Air Condition-

ing Signal.

Connect the ECU test harness

between the ECU and connector.

Disconnect "C" connector from
the engine wire harness only, not

the ECU (page 11-21).

Turn the ignition switch ON.
Measure voltage between C3 (+)

terminal and A26 (-) terminal.

Is there approx. 10 V?
Substitute a known-

good ECU and re-

check. If prescribed

voltage is now avail- able, replace the ori-

ginal ECU.
C3

A26

10 V

Turn the ignition switch OFF. Reconnect "C" connector to the
engine wire harness.
Turn the ignition switch ON.
Momentarily connect A15 ter-
minal to A26 terminal several
times.
Is there a clicking noise from the
A/C compressor clutch? Connect the RED/BLU terminal of

the 4P connector on the A/C

clutch relay to body ground. RED/BLU

A 15

Short
A26

View from UNDER-HOODFUSE/RELAY BOX side

Start the engine.
Is there a clicking noise from the
A/C compressor clutch?
See air conditioner in-

spection (section 22).

Repair open in RED/BLU wire be-

tween ECU (A15) and A/C clutch
relay.

Blower switch ON.
(To page 11-73)ProCarManuals.com

6. Turn the ignition switch OFF.

7. Reconnect the 2P connector on the EACV, then

remove CLOCK fuse in the under-hood fuse/relay

box for 10 seconds to reset ECU.

8. Restart and idle the engine with no-load conditions

in which the headlights, blower fan, rear defogger,

cooling fan, and air conditioner are not operating

for one minute, then check the idle speed.

Idle speed should be:ProCarManuals.com

Comes on and remains on while running:
1. Stop the engine.
2. Turn the ignition switch on and make sure that the anti-lock brake system indicator light comes on.
3. Restart the engine and check the anti-lock brake system indicator light.
There is no problem in the anti-lock brake system, if the anti-lock brake system indicator light goes off. Go to step 4, if the anti-lock brake system indicator light remains on.

4. Stop the engine.
5. Disconnect the service check connector from the connector cover located under the glove box.
Connect the two terminals of the service check connector with a jumper wire.
6. Turn the ignition switch on, but do not start the engine. 7. Record the blinking frequency of the anti-lock brake system indicator light.
The blinking frequency indicates the problem code.
CAUTION: Before starting the engine, disconnect the jumper wire from the service check connector, or else the
Check Engine light will stay on with the engine running.

Turn the ignition

switch on
PROBLEM CODE:

4– 2

Main Code: 4

Sub-Code: 2
PROBLEM

CODE: 1

Main Code: 1

Sub-Code: none
PROBLEM CODE

7–2

Main Code: 7

Sub-Code: 2

Indicator

light on

Indicator

light off
Connect the

jumper wire
2

Second

pause
1

Second

pause
5 second

pause

5 second

pause

1

Second

pause

1 Second

NOTE:
The control unit can indicate three problem codes (one, two or three problems). If the anti-lock brake system indicator light does not light, see Troubleshooting of Anti-lock Brake System
Indicator Light Circuit page 19-44.
If you miscount the blinking frequency, turn the ignition switch off, then turn on to blink the anti-lock brake
system indicator light again. After the repair is completed, disconnect the ALB 2,3 (No. 32) fuse for at least 3 seconds to erase the control

unit's memory. Then turn the ignition key on again and recheck.
The memory is erased if the connector is disconnected from the control unit or the control unit is removed from
the body. After recording the main and sub-code (if applicable), refer to the Symptom-to-System Chart.

ANTI-LOCK BRAKE SYSTEM INDICATOR LIGHT
SERVICE CHECK CONNECTOR

JUMPER WIREProCarManuals.com