(Deactivating the 48 V electrical system)

Precondition

Ignition is switched off

WARNING: Deactivate the 12-V electrical system
Risk of short circuits! Risk of fire!

Make sure that there is no battery charger connected to the jump start terminal in the engine compartment
For vehicles with additional electrical systems (48 V electrical system, high-voltage vehicle electrical system), this absolutely must be deactivated before the vehicle battery is disconnected

WARNING: Deactivate the 48-V electrical system
Risk of short circuits! Risk of fire!

Make sure that there is no charger connected to the jump start terminal in the engine compartment

NOTE: RISK OF DAMAGE
Damage to the 48-V battery
If a 48-V battery that is disconnected from the electrical system is activated, the battery electronics will be damaged

Only ever activate the 48 V electrical system when the 48 V battery is fully connected up

Deactivate the 48 V electrical system by opening the hood

Deactivation is automatic

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Check

NOTE: TECHNICAL INFORMATION
Zero voltage (48 V electrical system switched-off) is only displayed in PAD mode

Press the START-STOP button quickly 3 times without stepping on the brake pedal to establish the PAD mode
Check the de-energized state in the instrument cluster (KOMBI) in the PAD mode

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Desired state
- The Check Control message "48 V electrical system." switched off (1) is displayed
Result

» Absence of voltage cannot be specified with the Check Control message "48 V electrical system switched off." (1). Work start is not permitted

Measure
- Repeat the "deactivate 48 V electrical system" service function
  - Vehicle management > service function > voltage supply > deactivate 48 V electrical system
Only if the Check Control message "48 V electrical system switched off." (1) is displayed in the instrument cluster (KOMBI), the 12V battery may be disconnected

Contact the technical support if the absence of voltage is not clearly given

Result

» The Check Control message reports that 48 V electrical system is switched off

Measure
- Exit PAD mode by pressing the START-STOP button once without stepping on the brake pedal
"Disconnect the negative battery cable of the 48-V battery" work can be started
Unlock and disconnect the CAN bus plug connection (1) of the gear sensor
Release the clip (2)

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Loosen nut (1)
Detach the negative battery cable (2) of the 48-V battery from the negative battery terminal, set to one side and secure

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WARNING:
Unprotected battery terminals
Risk of short circuits! Risk of fire!
- Cover the vehicle battery
Cover the vehicle battery with the special tool 2 452 007 as shown
Position the battery ground lead (1) as shown

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