5 Operating modes5.1 Operating mode 1No voltage is applied to the DUT.⎯ Operating mode 1.1: not connected to wiring harness.⎯ Operating mode 1.2: connected to wiring harness simulating vehicle installation.5.2 Operating mode 2The DUT is electrically operated with test voltage, UB, as in a vehicle with shut-off engine and with allelectrical connections made.⎯ Operating mode 2.1: system/component functions are not activated (e.g. sleep mode).⎯ Operating mode 2.2: systems/components with electric operation and control in typical operating mode.5.3 Operating mode 3The DUT is electrically operated with test voltage, UA, with all electrical connections made.⎯ Operating mode 3.1: system/component functions are not activated.⎯ Operating mode 3.2: systems/components with electric operation and control in typical operating mode.