Honda Prelude 1993 Service Manual page 1309

Function Test
CAUTION: Be careful not to scratch or damago tho
defogger wires with ths toster p1ob6.
1. Check for voltage between the positive te.minal
and body ground with the ignition switch and
delogger switches ON.
There should be battery voltage.
a lf there is no voltage, check for:
- Faulty defogger relay.
- Faulty defogger switch.
- Faulty integrated control unit.
- An ooen in the GRN/BLK wire.
a lf there is battery voltage, go to st€p 2.
POSMVE TERMIIIAL
Check for continuity between the negative terminal
and body ground.
It there is no continuity, check for an open in the
defogger ground wire.
Touch the voltmeter positive probe to the halfway
point of each defogger wire and negative probo to
the negative terminal.
There should be app.oximately 6 V with the igni-
tion switch and detogger switch ON.
a lf the voltage is as specified, the defogger wire
i s O K .
a lf the voltage is not as specified, repair the
defogger.
- lf it is more than 6 V, ther€ is a break in the
negative half of th€ wire.
- lf it is l€ss than 6 V, there is a break in the
Dositive half of the wire.
Defogger Wires Repair
NOTE: To make an effective repair, the broken section
must be no longer than one inch.
1 .
Lightly rub the srea around the break with tine steel
wool, then clean it with alcohol.
2,
Car€fully mask above and bslow the broken portion
ot the defogge. wire with cellophane tape.
Using a small brush, apply a heavy coat of silver
conductive paint extending about 1/8" (3 mm) on
both sides of the break. Allow 30 minutes to dry.
NOTE: Thoroughly mix the paint before use.
Check lor continuity in the repaired wire.
Apply a second coat of paint in the same way Let it
drv three hours before removing the tape.
4 .
TAPE
23-231