1991 ACURA NSX window

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

System Description
Tailpipe Emission
The emission control system includes a three-way catalytic converter, exhaust gas recirculation (EGR) system,
crankcase ventilation system and evaporative control

system.

The emission control system is designed to meet federal and
state emission standards.
Inspection

Do not smoke during this procedure. Keep
any open flame away from your work area.
1. Starting the engine and warm it up to normal operating temperature by driving the car on theroad.
2. Connect a tachometer.
3. Check idle speed and adjust the idle speed, if necessary (page 11-84).
4. Warm up and calibrate the CO meter according to the meter manufacturer's instructions.
5. Check idle CO with the headlights, heater blower, rear window defogger, cooling fan, and air conditioner off.
CO meter should indicate 0.1 % maximum.ProCarManuals.com

Solenoid Flushing
1. Remove the motor relay from the under-hood fuse/relay box. (Location: page 19 - 40)
2. Install the auxiliary window switch (07KAZ — 001000A) into the two motor relay cavities in the
relay box.

MOTOR RELAY

WINDOW SWITCH

07KAZ-001000A

UNDER-HOOD
FUSE/RELAY

BOX

3. Disconnect the four modulator solenoid connec- tors.
4. Bleed any high-pressure fluid from the maintenance bleeder with the Bleeder T-Wrench, then retighten
the bleeder.

BLEEDER T-WRENCH

07HAA - SG00100

or 07HAA - SG00101

SOLENOID HEAD

MAINTENANCE
BLEEDER

8 x
1.25
mm
5.5 N·m
(0.55 kg-m,

4.0 Ib-ft)

POWER

UNIT

ACCUMULATOR/

PRESSURE SWITCH
6. Press the auxiliary switch to run the pump. After
the pump has run for about five seconds, press andrelease the remote starter switch three or four
times to open and close the solenoid. Continue run- ning the pump for about 30 seconds, then release
the auxiliary switch and open and close the solenoid another three or four times.
7. Repeat steps 4-6 for the other two solenoids.
8. Reconnect the solenoids and the pump relay. 9. Connect the ALB Checker and turn the Mode Selec- tor to "1". Start the engine and release the parkingbrake. Push the Start Test button on the ALB

Checker.

10. While the pump is running, place your finger over the top of the solenoid return tube in the modulatorresorvoir and check for leaks. If a solenoid is still leaking, replace the
modulator/solenoid
unit.
REMOTE

STARTER

SWITCH

TO BLK

TERMINAL

TO RED

TERMINAL
FRONT-

RIGHT

FRONT-RIGHT

REAR-LEFT
REAR-RIGHT

5. Connect the RED terminal from one solenoid to the
battery positive (+) terminal with a remote starter
switch. Connect the BLK terminal from the same
solenoid to the battery negative (-) terminal with a
jumper lead as shown.ProCarManuals.com

Rear Window Defogger Timer System:

View from terminal side
YEL/RED
WHT/BLU2

ORN
BLU/RED

GRN/RED
GRN/BLU2

WHT/GRN

YEL2

BLU/WHT1

PNK/BLU
WHT/BLK

BLU/YEL
BLU/

GRN

ORN/WHT
ORN/BLK
WHT/RED

View from wire side

Oil Pressure Indicator System:

(cont'd)ProCarManuals.com

Integrated Control Unit

Input Test (cont'd)

View from terminal side

Side Marker Light Flasher System:
YEL/RED
WHT/BLU2

ORN
BLU/RED
GRN/RED
GRN/BLU2

WHT/GRN

YEL2

BLU/WHT1

PNK/BLU
WHT/BLK

BLU/YEL
BLU/GRN

ORN/WHT
ORN/BLK
WHT/RED

View from wire side

Power Window key-off Timer System:ProCarManuals.com

CAUTION:
All SRS electrical wiring harnesses are covered with
yellow outer insulation.
Before disconnecting the SRS wire harness, install
the short connector on the airbag (see page 23-323). Replace the entire affected SRS harness assembly
if it has an open circuit or damaged wiring.

SRS MAIN WIRE HARNESS

DEFOGGER SWITCH
Removal, page 23-273

Test, page 23-275

REAR WINDOW DEFOGGER

Function Test, page 23-288

UNDER-DASH FUSE BOX
INTEGRATED

CONTROL UNIT
DEFOGGER

RELAY
ENGINE COMPARTMENT FUSE/RELAY BOX
Description Function:

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

contro
l
unit and the defogger stays on for 25 minutes or until the ignition swi\
tch is switched off.

The indicator light in the switch shows when the defogger is on.

Rear Window Defogger
Component
Location Index
ProCarManuals.com