Mitsubishi MOTORS Laser 1991, Service Manual, Page: 298 / 320

REAR WINDOW DEFOGGER Rear Window Defogger Switch
Service Adjustment Procedures/
Normal characteristic curve
Voltage
A (Center point)
ov
Positive Printed heater line
Negative
terminal terminal
Abnormal characteristic curve
Voltage
I
I
I
I
ov
I
Positive
Printed heater line Negative
terminal terminal
Break
‘Tape
paint
THE PRINTED-HEATER LINES CHECK
Run engine at 2,000 rpm. Check heater element with battery
at full.
Turn ON rear window defogger switch. Measure heater
element voltage with circuit tester at rear window glass
center A.
Condition good if indicating about
If is indicated at A, there is a break in the negative
terminals from A.
Move test bar slowly to negative terminal to detect where
voltage changes suddenly
If OV is indicated at A, there is a break in the positive
terminals from A. Detect where the voltage changes
suddenly with the same method described.
THE PRINTED-HEATER LINES REPAIR
l Thinner l Lead-free gasoline
l Tape
Fine brush
l Conductive paint
Clean disconnected area with lead-free gasoline. Tape along
both sides of heater element.
Mix conductive paint thoroughly. Thin the required amount
of paint in a separate container with a small amount of
thinner and paint break three times at 15 minute intervals.
Remove tape and leave for a while before use (circuit
complete).
When completely dry (after 24 hours) finish exterior with a
knife.
REMOVAL AND INSTALLATION
Refer to
INSPECTION
Operate the switch and check the continuity between the
terminals.
OFF
ON
tion light light
NOTE
O-O indicates that there is continuity between the terminals.