Circuit breakers — general information and performance testing (Chevrolet Trailblazer 1)

Circuit breakers protect the power circuits of devices such as power windows or power seats. Depending on the vehicle's equipment, the vehicle may be equipped with two 25-amp circuit breakers protecting the door lock circuit and one 30-amp circuit breaker for the power seat circuit located in the interior fuse/relay box located under the left rear seat.

These devices are switched on automatically after an instantaneous break in the circuit in which the overload has occurred. If the electrical circuit does not close after the switch is tripped, test it immediately.

To perform the test, pull the switch out of the contact clamps so that it remains connected to the circuit, and at the same time it is possible to connect the tester electrodes to its contacts.

Connect the voltmeter electrode to the ground point and connect the positive electrode to each circuit breaker terminal in turn. Each time you connect, the voltmeter should display battery voltage. If the voltage is recorded only when the voltmeter electrode is connected to one of the contact terminals, the circuit breaker must be replaced.