Pic. 8.52. Detection of a break in the rear window heating element in zone A-B
Turn on the ignition. Turn on the heated rear window.
Connect the voltmeter lead from the positive terminal to «positive» rear window defroster outlet.
Connect the wire coming from «negative» voltmeter output, to the thread from the side «negative» rear window heater outlet (line B) - The voltage should be approximately equal to the battery voltage.
move «negative» wire to line A (in the direction of the arrow) - the voltage should drop gradually.
A sharp drop in voltage means that the filament is damaged in this place (perform this operation for each thread). Mark the damaged area with a marker.
Search in zone C-A (pic. 8.53).
Pic. 8.53. Detection of a break in the rear window heating element in zone C–A
Connect the wire coming from «negative» voltmeter output, to «negative» rear window defroster outlet.
Connect the wire coming from «positive» voltmeter output, to one of the threads from the side «positive» rear window heater outlet (line C) – the voltage must be equal to the battery voltage.
move «positive» wire to line A (in the direction of the arrow) - the voltage should drop gradually.
A sharp drop in voltage means that the filament is damaged in this place (perform this operation for each thread). Mark the damaged area with a marker.