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1.Let the engine run (2,000
r/min), and check the printed heater with the battery
fully charged. 2.With the rear window defogger
switch "ON," use the circuit tester to measure the voltage
of each printed heater at the rear window glass centre A
point. If approximately 6 V is indicated, it is judged
good. 3.If the voltage of 12 V is indicated at the
A point, there is an open circuit between the A point and
negative terminal. Therefore, by moving the test bar slowly
to the negative side, search and determine the location
where the voltage changes suddenly (0 V). The location of
voltage change indicates the open circuit
position. 4.Also, if the voltage indicates 0 V at
the A point, there is an open circuit between the A point
and positive terminal. Therefore, search and determine the
location of voltage change (12 V) using the above mentioned
method. 5.If a malfunction such as open circuit
occurs, replace the rear window glass. (Refer to GROUP 42A
- Rear window glass .)
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