Mercedes W245 Rear Left Door Lock Latch Mechanism Actuator A1697303135

The Left Rear Door Lock for Mercedes B‑Class W245 is an original locking mechanism designed for the rear left side of the body. This component is responsible for precise locking and unlocking of the door, working in conjunction with the vehicle's factory electrical system. By adhering to manufacturer specifications, it ensures the proper operation of the central locking system and compatibility with your Mercedes' safety systems.

Specifications and technical data

• SKU: A1697303135
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1697303135
• Substitutable numbers: A1697303135, A 169 730 31 35, AS
• Location on the vehicle: Rear, Left
• Part type: Door Lock
• Category: Exterior Locks & Lock Hardware

Application and Function in the Vehicle

The presented lock belongs to the Locks and Latches group and is dedicated for installation in the rear left door of the Mercedes B‑Class W245 generation. It is responsible for:

• mechanically locking the door leaf to the body,
• transmitting drive from the central locking actuator to the latch mechanism,
• cooperating with the interior and exterior door handles,
• ensuring proper door closure without play or rattling.

Its specific placement on the vehicle minimizes the risk of selection errors – the component is designed specifically for the rear left side, which is important when planning the repair or replacement of a single lock.

Mechanism Construction and Electrical System Integration

The mechanism combines mechanical parts with actuators responsible for interacting with the lock control system. The construction is prepared for integration with the factory wiring harness and Mercedes control units, allowing for:

• consistent operation with the central locking system and locking function,
• correct response to signals from the remote control or the driver's door lock,
• appropriate opening and closing sequence for the rear doors.

Thanks to the original mounting geometry, the lock fits into the factory mounting holes in the W245 doors, facilitating service and reducing workshop labor time.

Benefits of Using an Original Lock

Using the original left rear door lock for the Mercedes B‑Class W245 helps maintain factory safety and comfort standards. Key advantages include:

• Compatibility with the W245 body – no need for modifications, drilling, or adjustments.
• Integration with the existing electrical system – maintaining correct operation of the central locking and locking functions.
• Stable mechanism operation – proper door closure, reduced play, and unwanted noises during driving.

This solution is particularly beneficial for collision repairs, replacing a damaged lock, or restoring full door functionality after a central locking system failure.

Practical Application in Service

Replacing the left rear door lock is a common service operation performed when there are issues with opening, closing, or locking the doors. This mechanism is suitable for both routine repairs and more extensive bodywork and painting jobs where door hardware needs to be transferred. Thanks to its original construction, it is possible to restore the factory door operation without interfering with the vehicle's electronics.

If you are planning comprehensive repairs or upgrades to the door area of your Mercedes and need other parts from the same group, such as locking mechanisms, actuators, or lock cylinders, check the available parts in the Mercedes Locks and Latches category.

More on Upgrades and Used Parts

When planning more extensive work on your car, it's worth learning about best practices for selecting and installing used parts and the impact of individual components on handling and safety. An extended discussion on topics related to upgrading popular models, selecting components, and the cost-effectiveness of using aftermarket parts can be found in the article Legend of the Hot Hatch: Evolution of the VW Golf GTI from Mk1 to Mk8 – Structural Changes and VW Car Parts.