Remove front seat
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 .
Removing the outer seat rail cover
- Unclip the outer seat rail cover (1) in arrow direction (2).
- Remove the outer seat rail cover (1) in arrow direction (3).
Removing the front seat rail covers
- Unlock the detents (1).
- Remove the front seat rail cover (2) in the arrow direction.
- Fully adjust the front seat to the front and top.
- Loosen screw (1).
- Remove end lining (2).
- Loosen screws (1).
Removing the front seat rail trims
- Move the front seat to the rear.
- Unclip the front seat rail trim (1) sideways in the direction of the arrow and remove towards the front.
- Loosen screws (1).
- Adjust the front seat to the center position.
- When removing the driver's seat:
Move the steering column to the fully retracted position and shift upwards fully.
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 disconnected from the on-board electrical system is activated, the battery electronics are damaged.- Only ever activate the 48 V electrical system when the 48 V battery is fully connected up.
NOTE: TECHNICAL INFORMATION
Observe notes on the 48-V battery. See additional information 6120... NOTES ON THE 48-V BATTERY . - Deactivate the 48 V electrical system by opening the hood.
Deactivation is automatic.
Check
NOTE: TECHNICAL INFORMATION
A display of the absence of voltage (48 V electrical system switched off) in the additional electrical storage 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.
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.
Result
» Zero potential cannot be determined with the Check Control message "48 V electrical system switched off." or "Electrical additional storage switched off." (1). Start of work is not permitted.
Measure
- See additional information:
Disconnect 48V additional storage with fault memory entry Relay jammed closed
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).
- 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.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.
Deactivate vehicle-specific high-voltage or low-voltage electrical system
NOTE: RISK OF DAMAGE
Damage to the high-voltage battery due to failure to deactivate the high-voltage system before disconnecting the on-board battery via Service Disconnect in BEV and PHEV vehicles.
Damage to the high-voltage system!- It is mandatory to deactivate the high-voltage system before disconnecting the on-board battery via Service Disconnect for BEV and PHEV vehicles.
- Work on the high-voltage system may only be carried out by specially trained and qualified persons.
- For additional information see: SAFETY INSTRUCTIONS ON HANDLING HYBRID CARS .
- For additional information see: NOTES ON REPAIR OF HIGH-VOLTAGE BATTERY UNIT .
NOTE: TECHNICAL INFORMATION
Follow the vehicle-specific instructions described in the additional information. - Deactivate the electrical system according to the specifications described in the following information.NOTE: RISK OF DAMAGE
Careless handling of tools and sharp-edged components.
Scratches, surface damage.- Protect working area.
- Handle tools and components carefully.
- Cover the door sill using protective covers.
- Place front seat (1) to the rear.
- Unlock plug connection (2) and disconnect.
- Loosen the cable clip (3).NOTE: RISK OF DAMAGE
Heavy component.
Heavy components can lead to injury or damage.- Remove and install heavy components with the aid of another person/other persons.
- Lift out front seat (1) with the assistance of a second person.