Sub-Battery Relay Control

Sub-Battery Relay prevents a loss in supply voltage to each system due to a battery voltage loss during engine start and restart. EMCM turns OFF the Sub-Battery Relay to interrupt the connection between the main battery power supply circuit and the Sub-Battery power supply circuit during the engine start and the restart. This protects the electric equipment connected to the Sub-Battery power supply circuit from an impact (e.g. memory reset) of a loss in supply voltage. After the engine is started normally, EMCM turns ON the Sub-Battery Relay to connect the main battery power supply circuit and the Sub-Battery power supply circuit. This allows the alternator to supply the generated power to all of the systems and to charge the main battery and Sub-Battery.