Removing the left bonnet lock

Preliminary works

Remove the top engine compartment COVER .

Only in vehicles with active pedestrian protection

WARNING: Pyrotechnic components.
Danger! Life-threatening injuries!

All work on pyrotechnic parts may be carried out by technically experienced and appropriately trained personnel only.
Replace any damaged part or ones that have been dropped.
For additional information see: 72 00 SAFETY REGULATIONS on handling components with gas generators.

Deactivating the 48 V electrical system

Prerequisite

Ignition is switched off.

WARNING: Deactivation of the 12 V vehicle electrical system.
Risk of short circuits! Risk of fire!

Make sure that no battery charger is connected to the jump start terminal point in the engine compartment.
For vehicles with additional electrical systems (48 V electrical system, high-voltage vehicle electrical system), it is mandatory to deactivate them before disconnecting the vehicle battery.

WARNING: Deactivation of the 48 V electrical system.
Risk of short circuits! Risk of fire!

Make sure that no charger is connected to the jump start support point in the engine compartment.

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

Only carry out activation of the 48V electrical system with a completely connected 48-V battery.

NOTE: TECHNICAL INFORMATION
Follow notes for 48-V battery. See further information 61 20... NOTES on 48-V battery.

Deactivate the 48V electrical system by opening the bonnet.
The deactivation takes place automatically.

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Check

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

Press the START-STOP button quickly 3 times without stepping on the brake pedal to establish the PAD mode.
Check isolation from the supply in the instrument cluster in PAD mode.

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Desired State

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

Result

» The absence of voltage cannot be determined by means of the Check Control message "48V electrical system switched off:" (1). Work is not permitted to be started.

Measure

Carry out the SERVICE function "48 V electrical system deactivation".

Vehicle management > Service functions > Voltage supply > Deactivate 48 V electrical system

Only when the Check Control message "48 V electrical system switched off."

(1) is displayed in the instrument cluster is it permitted to disconnect the 12 V battery.

If the absence of voltage is not indicated clearly, contact Technical Support.

Result

» The Check Control message signals that the 48V electrical system has been switched off.

Measure

Exit PAD mode by pressing the START-STOP button once without depressing the brake pedal.

The repair work "Disconnecting the negative battery cable of the 48-V battery" can be started.

Unlock and disconnect plug connection (1) of the CAN bus.
Release the clip (2).

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Loosen nut (1).
Pull off negative battery cable (2) of the 48-V battery from the negative battery terminal, set it aside and secure it.

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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 earth lead (1) as shown.

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Disconnecting all battery earth leads

See BATTERY EARTH LEADS .

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Unlock and disconnect plug connections (1).
Loosen screws (2).
Feed out the bonnet lock in an upwards direction.
Detach the cable (3) and remove the bonnet lock.

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