1991 ACURA NSX Service Repair Manual

Power Door Locks

Control Unit Input Test

Remove the glove box, then disconnect the 18-P con-

nector from the control unit.

Inspect the connector terminals to be sure they are all

making good contact.

If the terminals are bent, loose, or corroded, repair

them as necessary, and recheck the system.

If the terminals look OK, make the following input

tests at the connector.

If any test indicates a problem, find and correct

the cause, then recheck the system.

If all the input tests prove OK, the control unit

must be faulty; replace it.
POWER DOOR LOCK

CONTROL UNIT

View from wire sideProCarManuals.com

No.

1

2

3

4

5

6

7

8
9

Wire

BLK

ORN

GRN/WHT2
WHT/YEL

BLK/WHT
BLK/RED

BLU/WHT

BLU/RED1

GRY/WHT

GRN/YEL2
GRN/BLU

GRN/RED

BLU/GRN

WHT/RED
and

YEL/RED
Test condition
Under all conditions.
Under all conditions.Driver's door lock
switch in LOCK.
Driver's door lock
switch in UNLOCK.Passenger's door lock
switch in LOCK.
Passenger's door lock
switch in UNLOCK.
Driver's door lock knob
in LOCK.
Driver's door lock knob
in UNLOCK.
Passenger's door lock key cylinder switch in

LOCK.

Passenger's door lock
key cylinder switch in

UNLOCK.

Driver's door open.
Passenger's door open.
Ignition key is inserted

into the ignition switch.

Connect the ORN termi-
nal to the WHT/RED ter-

minal, and the YEL/RED
terminal to the BLK ter- minal momentarily.
Connect the ORN ter- minal to the YEL/RED
terminal, and the
WHT/RED terminal to
the BLK terminal momentarily. Test: Desired result
Check for continuity to

ground: There should be
continuity.

Check for voltage to ground:
There should be battery
voltage.

Check for voltage to ground:
There should be 1 V or less.
Check for voltage to ground: There should be 1 V or less.
Check for voltage to ground:
There should be 1 V or less.
Check for voltage to ground:
There should be 1 V or less.
Check for voltage to ground:
There should be 1 V or less.
Check for voltage to ground:
There should be 1 V or less.
Check door lock operation:
Both doors should lock as
power and ground are con-
nected momentarily.
Check door lock operation:
Both doors should unlock as
power and ground are con-
nected momentarily. Possible cause if result is not obtained
Poor ground (G401, 402)

An open in the wire.

Blown No. 35 (20A) fuse.
An open in the wire.
Faulty driver's door lock switch.
Poor ground (G401, 402).
An open in the wire.
Faulty passenger's door lock
switch.
Poor ground (G401, 402).
An open in the wire.
Faulty driver's door lock actuator.
Poor ground (G401, 402).
An open in the wire.
Faulty passenger's door lock
actuator.
Poor ground (G401, G402).
An open in the wire.
Faulty door switch.
Poor ground (G401, G402).
An open in the wire.
Faulty ignition key switch.
Poor ground (G401, 402).
An open in the wire.
Faulty actuator.
An open in the wire.
CAUTION: To prevent damage to the motor, connect power and ground only momentarily.ProCarManuals.com

Troubleshooting

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

Item to be inspected

Symptom

Both windows do not

operate.

Driver's window does not

operate in any position.

Driver's window does not

operate in AUTO.

Passenger's window does

not operate.

Both windows do not

operate within the first

ten minutes after the igni-

tion switch has been turn-

ed
OFF.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

Troubleshooting

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

Switch Removal
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('93-'96)). Replace the entire affected SRS harness assembly if
it has an open circuit or damaged wiring.
1. Remove the dashboard tower cover and disconnect
the connectors from the floor wire harness.

CONNECTORS
FOOT WELL LIGHT LIGHTS-ON

CHIME
DASHBOARD
LOWER COVER

2. Disconnect the 18-P connector from the floor wire
harness.
CAUTION: Be careful not to damage the SRS wire
harness.

BEAR WINDOW

DEFOGGER SWITCH
18-P
CONNECTOR

3.
Remove
the
tilt
cover.
TILT COVER
4. Remove the steering column lower cover and upper

cover.
UPPER COVER
LOWER COVER
NOTE: Be careful not to damage the steering column

covers.

5. Remove the four screws, then remove the rear win- dow defogger switch and windshield wiper/washer

switch assembly.
REAR WINDOW
DEFOGGER

SWITCH

WINDSHIELD WIPER/WASHER SWITCHProCarManuals.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

Switch Test

1. Remove the dashboard lower cover.

2. If necessary, remove the knee bolster.

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

harness.

4. Check for continuity between the terminals in each

switch position according to the table.

18-P

CONNECTOR
View from wire sideProCarManuals.com