Honda Acura NSX 1991 Service Manual page 1264

-Function Test
CAUTION: Be careful not to scratch or damage the
defogger wires with the tester probe end.
1 . Check for voltage between the positive terminal and
body ground with the ignition switch and the defog-
ger switch ON.
There should be battery voltage.
If there is no voltage, check for:
l
l If there is battery voltage, go to step 2.
POSITIVE TERMINAL
Check for continuity between the negative terminal
and body ground.
If no continuity, check for open in the defogger
ground wire.
Connect the voltmeter positive probe to the middle
of each defogger wire, and the negative probe to the
negative terminal.
The should be approximately 6 V with the ignition
switch and the defogger switch ON.
is OK.
If there is battery voltage, the defogger wire is
l
broken in the negative side.
If there is no voltage the defogger wire is broken
l
in the positive side.
2 3 - 2 8 0
/NEGATIVE TERMINAL