Description
Description
Electric right rear door lock (door latch/actuator) designed for the Citroën C4 Grand Picasso. Identified by PSA part code 9138J8, this unit controls the locking and unlatching of the right rear door and integrates with the vehicle’s central locking system. It is intended as a direct-fit replacement for worn or malfunctioning original equipment.
Key Features
- Direct replacement for PSA part number 9138J8.
- Operates the mechanical latch and interfaces with the central locking actuator circuit.
- Designed for right rear (passenger side) door installation on Citroën C4 Grand Picasso models.
- Suitable for professional repair shops and competent DIY installers.
Fitment And Applications
Fits: Citroën C4 Grand Picasso (right rear door). This part is listed under PSA/PSA Group applications; always verify the part number 9138J8 against your vehicle’s VIN or service documentation before ordering to ensure correct fitment.
Function
The door lock unit secures the door latch, receives electrical signals from the central locking system, and drives the latch mechanism to lock or unlock the door. It ensures the door remains latched while driving and enables remote or central locking operation.
Common Failure Modes And Causes
Typical reasons for replacement include:
- Actuator motor failure or worn internal gears causing intermittent or complete loss of movement.
- Water ingress or corrosion that impedes electrical contacts or mechanical parts.
- Physical damage to the latch assembly from impacts or forced entry attempts.
- Electrical problems such as connector corrosion, wiring faults, or blown fuses affecting the central locking circuit.
Replacement Guide
Basic replacement steps (general guidance):
- Disconnect the negative battery terminal to prevent accidental short circuits.
- Remove the interior door trim and any trim clips to access the inner door panel.
- Carefully detach the water/vapor barrier to expose the lock assembly without damaging it.
- Unplug the electrical connector from the lock actuator and remove the fastening screws or bolts.
- Release any linkage rods or clips connecting the actuator to the latch and remove the old unit.
- Install the new lock unit, reconnect linkage and electrical connector, and check operation before reassembling the door trim.
- Confirm correct central locking operation and mechanical latching; reattach the vapor barrier and interior trim.
Note: Follow vehicle-specific service manual instructions for torque values, clip locations, and airbag-related precautions where applicable.
Technical Information
- Manufacturer: PSA (Citroën / Peugeot)
- Model: Citroën C4 Grand Picasso
- Product Codes: 9138J8
- Other Numbers: N/A
