1997 ACURA NSX Service Repair Manual

Rear Window Defogger

Troubleshooting

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

Switch Replacemen t
SRS component s ar e locate d i n thi s area . Revie w th e
SR S componen t locations , precautions , an d procedure s
i n th e SR S sectio n 24 befor e performin g repair s o r ser -
vice .
1. Remov e th e dashboar d lowe r cover , an d disconnec t
th e connectors .
2 . Remov e th e dashboar d lowe r pad .
DASHBOAR D LOWE RCOVERDASHBOAR D LOWE RPAD
3. Remov e th e til t cover .
TILT COVE R
4. Remov e th e steerin g colum n covers .
NOTE : B e carefu l no t t o damag e th e steerin g col -
um n covers .
UPPER COVE R
LOWE R COVE R
(cont'd)
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Switch Replacement (cont'd)
Rear Window Defogger

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 rear win-

dow defogger-light switch assembly.

7. If necessary, replace the rear window defogger

switch bulbs.ProCarManuals.com

Rear Windo w Defogge r
Relay Tes t
1. Remov e th e defogge r rela y i n th e engin e compart -
men t fuse/rela y box .
2 . Chec k continuit y a t th e rela y terminals .
• Ther e shoul d b e continuit y betwee n th e C an d D
terminals .
• Ther e shoul d b e continuit y betwee n th e A an d B
terminal s whe n powe r an d groun d ar e connecte d
t o th e C an d D terminals .
• Ther e shoul d b e n o continuit y betwee n th e A
an d B terminal s whe n powe r i s disconnected .
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Switch Tes t
1. Remov e th e dashboar d lowe r cove r (se e pag e
23-287 ).
2 . I f necessary , remov e th e dashboar d lowe r pad .
3 . Disconnec t th e 18 P connecto r fro m th e floo r wir e
harness .
4. Chec k fo r continuit y betwee n th e terminal s i n eac h
switc h positio n accordin g t o th e table .
REARWINDO WDEFOGGE RSWITCH
18PCONNECTO R
View fro m wir e sid e
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Rear Window Defogger

Function Test

CAUTION: Be careful not to scratch or damage the

defogger wires with the tester probe.

Check for voltage between the positive terminal

and body ground with the ignition switch and the

defogger switch ON. There should be battery

voltage.

If there is no voltage, check for:

— Faulty defogger relay.

— An open in the BLK/GRN wire.

If there is battery voltage, go to step 2.

POSITIVE TERMINAL

NEGATIVE TERMINAL

2. Disconnect the positive terminal, check for con-

tinuity between the negative terminal and body

ground. If there is no continuity, check for an open

in the defogger ground wire.

3. Reconnect the positive terminal, touch the

voltmeter positive lead to the middle of each defog-

ger wire, and the negative lead to the negative ter-

minal. There should be approximately 6 V with the

ignition switch and the defogger switch ON.

If the voltage is as specified, the defogger wire

is OK.

If there is battery voltage, the defogger wire is

broken on the negative side.

If there is no voltage, the defogger wire is

broken on the positive side.
Defogger Wires Repair

To make an effective repair, the broken section must be

no longer than one inch.

1. Lightly scrub the area around the break with fine

steel wool, then clean it with alcohol.

2. Carefully mask above and below the broken section

with cellophane tape.

OPEN

CELLOPHANE

DEFOGGER WIRE

3. Using a small brush, apply a heavy coat of silver

conductive paint extending about 1/8" on both

sides of the break. Thoroughly mix the paint before

use. Let it dry for thirty minutes.

PAINT

4. Check for proper operation with a voltmeter (it

should read half of battery voltage at the mid-

point).

5. Apply a second coat of paint in the same way. Let it

dry for three hours before removing the tape.ProCarManuals.com

Wipers/Washers
Component Locatio n Inde x
UNDER-HOO DRELAY BO X B
WIPE R LO W RELA Y
Wir e colors : BLU/RED ,
BLU/YEL , GRN/BLK , YEL/RE D
Test , pag e 23-29 4 WASHE
R MOTO R RELA Y
Wir e colors : PNK , BLK/YEL ,
YEL/GRN , BL K
Test , pag e 23-29 4
WINDSHIEL D
WIPER/WASHE R
SWITC H
Test , pag e 23-29 8
Replacemen t 23-29 6
WINDSHIEL
D WIPE R
ARMS/BLADE S UNDER-HOO
D
RELAY BO X A
WASHE R FLUI DRESERVOI RReplacement , pag e 23-29 9 COMBINE
D OPERATIO N
WIPER/WASHE R CIRCUI T
(In th e integrate d contro l unit )Test , pag e 23-17 1
WINDSHIEL D
WASHE R MOTO R
Test , pag e 23-29 9 WINDSHIEL
D WIPE R MOTO R
Test , pag e 23-29 5
Replacement , pag e 23-29 6
Descriptio n
The syste m is equippe d wit h a n intermitten t relay , a lo w rela y an d a hig h relay . Wipe r operatio n a t IN T an d L O position s i s
controlle d b y th e intermitten t wipe r circui t (incorporate d i n th e integrate d contro l unit) .
SR
S component s ar e locate d i n thi s area . Revie w th e
SR S componen t locations , precautions , an d procedure s
in th e SR S sectio n 24 befor e performin g repair s o r ser -
vice .
WIPE R INTERMITTEN TRELAYWire colors : BLU/RED , BLK ,
BLU/WHT , BLU/YEL , GRN/BL K
Test, pag e 23-29 3 WIPE
R HIG H RELA Y
Wir e colors : BLU/GRN ,
BLK , GRN/BLK , YEL/RE D
Test , pag e 23-29 4
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1. Remove the wiper intermittent relay from the

under-hood relay box B.

2. There should be continuity between the A and C

terminals when power and ground are connected to

the E and F terminals.

There should be continuity between the B and C

terminals when power is disconnected.
Troubleshooting

Intermittent Wiper Relay TestProCarManuals.com