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The best way to retain all of the presets is to use a jump box that plugs into the cigarette lighter.
12 00 ... - Instructions for disconnecting and connecting battery Before disconnecting battery: Turn off the ignition and other electrical loads/consumers to prevent sparking when reconnecting. Note: If the ignition is not turned off when the battery is disconnected, fault memories may be set in some control units. Important!
General notes on disconnecting battery:
Do not under any circumstances release socket-head cap screw of IBS.
After connecting battery: Important! The scope of application of some systems may be restricted after a power supply interruption.
Likewise, individual settings may be lost. Settings or activations must be carried out, depending on the equipment specification. Example:
Vehicles with a two-battery system Receiving/giving starting assistance via jump start terminal The engine can be jump-started with an external voltage supply via the jump start terminal on the right side of the engine compartment. Note: The starter battery is isolated from the alternators when the engine hood/bonnet is open. Giving starting assistance via the jump start terminal is thus limited by the capacity of the starter battery when the engine hood/bonnet is open. Charging starter and equipment batteries via jump start terminal The starter battery is charged as a matter of priority with a charger connected to the jump start terminal. The voltage at the starter battery is the decisive factor in determining whether the equipment battery is also included in the charging operation. The supplementary control unit automatically detects a charging operation at a charging voltage at the starter battery of >=13.5 V. The isolating relay is closed and thus the equipment battery is connected in parallel. Both batteries are now charged. Prerequisite: