Benz 164 Battery Control

· F3 Cockpit fuse box
· F4 Load compartment fuse and relay box
· F32 Front prefuse box
· F33 Battery compartment prefuse box
· F58 Engine compartment fuse and relay box
· G1 Battery
· G1/7 Additional battery
· N10 Front SAM control unit
· N10/8 Rear SAM control unit
Models 164 and 251 have a two-battery electrical system, consisting of a battery (G1) and an additional battery (G1/7), both under the front passenger seat.
The battery (G1) supplies all the electrical consumers in the vehicle and is also used for starting the engine.
The additional battery (G1/7) allows the transmission (shift-by-wire) to be shifted to position "P" even if the on-board electrical system battery has failed. For this purpose, the EIS [EZS] control unit (N73) safeguards the supply to the intelligent servo module for DIRECT SELECT control unit (A80) with the additional voltage from the additional battery (G1/7) if:
• The battery (G1) fails and the transmitter key (A8/1) is removed from the EIS [EZS] control unit (N73)
• In vehicles with KEYLESS GO, the ignition is off and the driver door is opened
The capacity of this battery is 1.2 Ah. The additional battery (G1/7) is charged by the front SAM control unit (N10). The front SAM control unit (N10) also incorporates a battery state recognition function (BZE) for the additional battery (G1/7).
Battery (G1)
· Location
The battery (G1) is located under the front passenger seat and can be removed without having to remove the seat.
Additional battery (G1/7)
· Location
The additional battery (G1/7) is located beside the battery (G1) under the front passenger seat and can be removed without having to remove the seat.
· A32m1 Blower motor
· A80 Intelligent servo module for DIRECT SELECT
· B48 Front passenger seat occupied and child seat recognition sensor
· F3 Cockpit fuse box
· F4 Load compartment fuse and relay box
· F32 Front prefuse box
· F33 Battery compartment prefuse box
· F58 Engine compartment fuse and relay box
· G1 Battery
· G1/7 Additional battery
· G2 Alternator
· M1 Starter
· M4/7 Engine and air conditioning electric suction fan with integrated control
· N2/7 Restraint systems control unit
· N10 Front SAM control unit (illustrated in duplicate for clarity)
· N10/8 Rear SAM control unit
· N14/3 Glow time output stage
· N47-5 ESP control unit
· N73 EIS [EZS] control unit
· N99 DC/DC converter control unit
· R22/3 PTC heater booster
· A Circuit 15R
· B Circuit 87, engine

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