| 1. Launch the engine and include a heater of back glass. |
| 2. Connect the negative probe of the voltmeter to "mass" of the car. |
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3. In turn connect the voltmeter probe to the center of each conducting strip of a heater of back glass. The voltmeter has to show tension about 6 Century. |
| 4. If the voltmeter shows voltage over 6 V, the conducting strip of a heater means has break from outside between the point of connection of the voltmeter and the party of a heater connected to "weight". |
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5. If the voltmeter shows voltage below 6 V, the conducting strip of a heater means has break from outside between the point of connection of the voltmeter and the party of a heater connected to the positive plug of the rechargeable battery. |
