9L –4 GLASS AND MIRRORS
DAEWOO M-150 BL2
DIAGNOSTIC INFORMATION AND PROCEDURES
TESTING REAR WINDOW DEFOGGER GRID LINE
D109E301
If it has been observed during use that a grid line is inop-
erative, the following procedure can be used to find the
break. If none of the grid lines is operating, a full system
diagnosis should be completed before attempting to re-
pair the grid lines.
1. Turn the ignition ON.
2. Turn on the rear window defogger.
Notice: Use care when touching the voltmeter terminals
to a grid line. If the terminals are roughly applied, the grid
line may be scratched, resulting in an open circuit.
3. From the inside of the vehicle, connect a voltmeter to
each end of a grid line. The voltmeter will indicate bat-
tery voltage if the grid line is open.
4. If a grid line is found to be open, move a voltmeter ter-
minal from one side of the grid line and retest at a
point nearer to the other side of the window. Continue
to retest, each time bringing one of the voltmeter ter-
minals closer to the opposite side of the window from
where it was originally connected. The break in the
grid line is at the point where the voltmeter begins
reading 0 volts instead of battery voltage.
5. Use a marking crayon to lightly mark the break point
on the rear window. Mark the glass instead of mark-
ing directly on the grid line, and make the mark far
enough from the grid line so that the mark can easily
be removed without disturbing the repair.
6. Use a grid line repair kit to fix the break in the grid line.
Refer to “Rear Window Defogger Grid Line Repair” in
this section.
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