The device rear window defogger
Fig. 7.76. Check the integrity of the conductors of the rear screen: 1 - lead of the voltmeter; 2 - direction of finger pressure; 3 - foil; 4 - track heating element
In order not to damage the track of the heating element when checking, wrap the foil on the tips of the probe of the voltmeter. To check for an open press the foil with your finger and run it on all tracks of the heating element (Fig. 7.76).
Fig. 7.77. Driving test the resistance of the heating element tracks rear window
Turn on the rear window switch and check the voltage on each lane at a point in the middle of the window (Fig. 7.77). If the voltage on the voltmeter is about 6, the track of the heating element can be considered intact.
Fig. 7.78. Locating points cliff paths rear window heater when the voltmeter reads 12 V (dot the cliff marked with a cross)
If the track is cut short in the middle between the center point and the terminal "+" (Fig. 7.78), the voltmeter shows voltage of 12 V.
Fig. 7.79. Locating a break point track of the heating element in the rear window voltmeter readings of zero (point cliff marked with a cross)
If there was a break in the middle of the track between the center point and the terminal "-" (Fig. 7.79), the voltmeter shows voltage equal to zero.
To find the exact location of the break slowly move the probe along the path of the voltmeter to the proposed site of the cliff. Locate the point where the stress comes and drops to zero. The point at which the voltage is changed is a point of an open circuit.
Check the ohmmeter the resistance of each track of the heating element between one of the conclusions and the mid-point between the track and the same conclusion, and the midpoint of the adjacent track. Resistance sections, which is broken will be twice the impedance another section. Move the probe tester in the section with a gap to the point at which the resistance changes dramatically.
Removing Broken conductor heating element
To do this you will need: a conductive paint, paint thinner, adhesive tape remover Silicone.
With a fine brush, wipe the surface of the glass found places around the cliff paths, clean the surface of the stripper for silicone and glue two pieces of masking tape along the damaged wire on either side of the break, so that pieces of tape do not overlap on the thread guide.
Strongly shake the container with a conductive paint brush and apply it to place the cliff in three layers with an interval of approximately
15 min (pasted adhesive tape sections are structured, which provides a layer of paint width comparable to the width of the tracks of the heating element).
Remove the masking tape.
Before turning on heating the glass, let the paint dry enough time (drying time indicated on the package with paint).
To improve the appearance of the conductive paths after the complete drying (24 hours) with a knife, carefully remove the excess paint.