Circuit Breaker: Description and Operation

Automatic resetting circuit breakers are used to protect the power seat and power window voltage supply circuits. These circuit breakers are located in the fuseblock module, which is located under the instrument panel. These circuit breakers can protect the systems from a short circuit, or from an overload condition caused by an obstructed or stuck seat adjuster or power window regulator or switch. The circuit breaker cannot be repaired and, if faulty or damaged, it must be replaced.


The circuit breaker contains a bi-metal strip sandwiched between two contacts forming the connection in the circuit. An overload condition causes the bi-metal strip to heat and bend to the open position, disconnecting current flow to the circuit. Then as the system overload or short circuit is removed, the bi-metal strip cools, re-establishing contact to allow current flow to the circuit.