REAR WINDOW DEFOGGER
Troubleshooting/Service Adjustment Procedures
OPERATION
TROUBLESHOOTING HINTS
l
When the defogger switch is turned ON with
1. Defogger is inoperative.
the ignition switch in ON position, the defogger
1) Indicator does not come on, either.
relay is energized causing defogger to operate.
l
Check multi-purpose fuse
l
At the same time, the defogger indicator light
l
Check defogger relay.
lights up indicating that the defogger is in
2) Indicator comes on.
operation.
l
The defogger timer keeps the defogger relay
l
Check defogger.
remaining energized for 10 minutes after the
2. Defogger timer is inoperative.
defoaaer switch has been turned ON. If the
l
Check defogger timer.
switch is pushed a second time during
this
period, timer is
and the
defogger is turned off.
NOTE
For information concerning the defogger relay
a n d
timer, refer to
a n d
54-164. --
Normal characteristic curve
Voltage
h e a t e r l i n e
Abnormal characteristic curve
Open-circuit
point
0”
heater
N e g a t i v e
terminal
terminal
Break
Tape
Conductive
paint
THE PRINTED-HEATER LINES CHECK
Run engine at 2,000 rpm. Check heater element with
battery at full.
(2) Turn ON rear window defogger switch. Measure heater
element voltage with circuit tester at rear window glass
center A.
Condition good if indicating about
(3) If 12 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 V).
(4) If 0 is indicated at A, there is a break in the positive
terminals from A. Detect where the voltage changes
suddenly (12 with the same method described.
THE PRINTED-HEATER LINES REPAIR
REQUIRED MATERIALS
l
Thinner
l
Tape
l
Conductive paint
l
Lead-free gasoline
l
Fine brush
Clean disconnected area with lead-free gasoline. Tape
along both sides of heater element.
(2) 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.
(3) Remove tape and leave for a while before use (circuit
complete).
(4) When completely dry (after 24 hours) finish exterior with a
knife.
Caution
Clean glass with a soft cloth (dry or damp) along
defogger heater element.
TSB Revision