Removing the left hood lock

Preliminary work

Refer to REMOVING THE COVER FOR THE CENTER ENGINE COMPARTMENT .

Only on vehicles with active pedestrian protection

WARNING: Pyrotechnic components.
Danger! Immobilization period-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: SAFETY REGULATIONS FOR HANDLING COMPONENTS WITH GAS GENERATORS .

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-STOPPING 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-STOPPING 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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Disconnecting all battery ground leads

See 61 20 900 DISCONNECTING AND CONNECTING BATTERY GROUND LEAD (ALL NEGATIVE BATTERY CABLES) (740I 2016-2022, 740I XDRIVE 2017-2022, 750I 2016-2019, 750I XDRIVE 2016-2022, M760I XDRIVE 2017-2022) , or 61 20 900 DISCONNECTING AND CONNECTING BATTERY GROUND LEAD (ALL NEGATIVE BATTERY CABLES) (740E XDRIVE PHEV 2017-2019, 745E XDRIVE PHEV 2020-2022) .

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

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