Method for testing a multi-phase connection line for connecting a bridge circuit to an electric motor , wherein the method comprises the following steps: switching at least one switching pattern by at least two switches of the bridge circuit , wherein a first high-side switch of the bridge circuit , said switch being connected to a first phase of the connection line , is switched on as the first switch of the switching pattern and a second low-side switch of the bridge circuit , said switch being connected to a second phase of the connection line , is switched on as the second switch of the switching pattern ; measuring a current flow resulting from the switching pattern ; and detecting damage to the connection line using a value of the at least one current flow , wherein in the switching step , in order to reverse a current direction of the current flow in the phases , a second high-side switch of the bridge circuit , said switch being connected to the second phase , and a first low-side switch of the bridge circuit , said switch being connected to the first phase , are switched on as the further switching pattern , and wherein, in the measuring step , a further current flow resulting from the further switching pattern is measured, wherein, in the detecting step , the further current flow is also used to detect the damage, characterized in that a rotor position detection is performed before an interruption diagnosis of the connection line is carried out, wherein, when the rotor position is known, the phase energization of the electric motor that does not cause a torque in the electric motor is identified, and the interruption diagnosis is carried out by selecting the switching pattern on the basis of said phase energization identified in this way. switching at least one switching pattern by at least two switches of the bridge circuit , wherein a first high-side switch of the bridge circuit , said switch being connected to a first phase of the connection line , is switched on as the first switch of the switching pattern and a second low-side switch of the bridge circuit , said switch being connected to a second phase of the connection line , is switched on as the second switch of the switching pattern ; measuring a current flow resulting from the switching pattern ; and detecting damage to the connection line using a value of the at least one current flow , wherein in the switching step , in order to reverse a current direction of the current flow in the phases , a second high-side switch of the bridge circuit , said switch being connected to the second phase , and a first low-side switch of the bridge circuit , said switch being connected to the first phase , are switched on as the further switching pattern , and wherein, in the measuring step , a further current flow resulting from the further switching pattern is measured, wherein, in the detecting step , the further current flow is also used to detect the damage, characterized in that a rotor position detection is performed before an interruption diagnosis of the connection line is carried out, wherein, when the rotor position is known, the phase energization of the electric motor that does not cause a torque in the electric motor is identified, and the interruption diagnosis is carried out by selecting the switching pattern on the basis of said phase energization identified in this way. <EOS>