METHOD FOR IDENTIFYING A SHORT CIRCUIT TO THE POSITIVE TERMINAL OF A BATTERY AND CIRCUIT DEVICE FOR CARRYING OUT THE METHOD

摘要

In a method for identifying a short circuit to the positive terminal of a battery in a circuit of a motor vehicle having an electronic circuit breaker HS (123) which can be actuated by a control device (120) and having at least one, preferably a plurality of electrical switches LSx (124, 125, 126) which switch on and switch off loads (110, 111, 112), the switching state of said switches being reported to the control device (120) and it being concluded that operation is fault-free when the connected loads (110, 111, 112) are supplied with voltage when the electronic circuit breaker HS (123) is switched on and a "short circuit" or "load drop" message is produced at the circuit breaker LSx (124, 125, 126) when the electronic circuit breaker HS (123) is switched off, the supply voltage is switched off in a deliberate manner by means of the electronic circuit breaker HS (123), and the switching state at each electrical switch LSx (124, 125, 126) which switches on and switches off the loads (110, 111, 112) is detected at the end of a driving cycle of the motor vehicle. It is concluded that there is a fault when a "short circuit" or "load drop" message is not produced at at least one of the electrical switches LSx (124, 125, 126).