Component Tests and General Diagnostics

INSPECTION

DEFOGGER SWITCH
Use a circuit tester to check defogger switch for continuity.
If switch has no continuity between terminals,replace.

DEFOGGER WIRE





NOTE:
- When cleaning rear window glass,use a dry cloth to wipe it along wire direction.
- When cleaning glass,do not use detergent or abrassive containing glass cleaner.
- When measuring wire voltage,use a tester with negative probe wrapped with a tin foil which should be held down on wire by finger pressure.





1) Checking wire damage
a. Turn main switch ON.
b. Turn defogger switch ON.
c. Use a voltmeter to check voltage at the center of each heat wire, as shown.





If measured voltage is 1OV, wire must be damaged between its center and positive end.If voltage is zero,wire must be damaged between its center and ground.





2) Locating damage in wire
a. Touch voltmeter positive (+) lead to heat wire positive terminal end.
b. Touch voltmeter negative (-) lead with a foil strip to heat wire positive terminal end,then move it along wire to the negative terminal end.
c. The place where voltmeter fluctuates from zero to several volts is where there is damage.

NOTE: If heat wire is free from damage,voltmeter should indicate 12V at heat wire positive terminal end and its indication should decrease gradually toward zero at the other terminal (ground).