Rear Window Defogger
Gomponent Location Index
FUSE/RELAY BOX
REAB WINDOW DEFOGGER SWTTCHInput Test, p89e 23-113
REAR WINDOW DEFOGGERFunction Test. page 23-112DetoggerWre Repair, page 23-112
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23-110
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Rear Window Defogger
Function Test
1. Check for voltage between the positive terminal andbody ground with the ignition switch and defoggerswitch ON.
There should be battery voltage.
. lf there is no voltage. check for:- faulty defogger relay.- faulty defogger switch.- an open ,n the BLK/BLU, WHT/GRN, BLU/YEL,
or BLK wire.
. lf there is battery voltage, go to step 2.
POSITIVE TERMINAL
Check for continuity between the negative terminaland body ground.
lf there is no continuity, check for an open in thedefogger ground wire.
Touch the voltmeter positive probe to the halfwaypoint of each defogger wire, and the negative probe
to the negative terminal. Be careful not to scratch ordamage the defogger wires with the tester probe.There should be approximately 6 V with the ignitionswitch and the defogger switch ON.
. lf the voltage is as specified, the defogger wire isoK.
. lf the voltage is not as specified, repair the defog-ger wire.- lf it is more than 6 V, there is a break in thenegative half of the wire.- lf it is less than 6 V, there is a break in thepositive half of the wire.
23-112
Defogger Wire Repair
NOTE: To make an effective repair, the broken sectionmust be no longer than one inch.
1. Lightly rub the area around the broken section withfine steel wool, then clean it with alcohol.
2. Carefully mask above and below the broken portionof the defogger wire with cellophane tape.
CELLOPHANETAPE
Mix the conductive paint thoroughly. Using a smallbrush, apply a heavy coat of the conductive paint
extending about 1/8" on both sides of the break.Allow 30 minutes to dry.
Check for continuity in the repaired wire.
Apply a second coat of paint in the same way. Let itdry three hours before removing the tape.
5,
OPEN
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Switch Input Test
NOTE: Before testing, check for blown No. 17 (7.5 A)
fuse in the under-dash fuse/relay box.
1. Remove the center panel {see section 20).
REAR WINOOW DEFOGGER SWITCHlin the heater control oanel)CENTER PANEL
Check for voltage between the 84 and 87 terminals
in each switch position when battery power is con-
nected to the B l terminal.
OFFless than 0.4 V
ONbaftery voltage
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23-113
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