Description
Electric door lock for the left rear door. For Citroën C4 Picasso and Grand C4 Picasso vehicles.
Reliable electric lock unit for the left rear door, engineered to work with the factory central locking and remote locking systems on Citroën C4 Picasso and Grand C4 Picasso models. Commonly referenced by part number 9137H1, this unit replaces the internal latch and actuator assembly that secures the door and transmits lock/unlock signals. The design integrates the motor, gear set and microswitch to provide positive locking feedback to the vehicle’s control module.
Technical Information
- Manufacturer: Stellantis (Citroën / Peugeot)
- Model: Citroën C4 Picasso, Grand C4 Picasso
- Product Codes: 9137H1
- Other Numbers: —
Function And Application
The unit performs two main functions: mechanical latching of the left rear door and electrical actuation for central locking. When a lock or unlock command is received, the internal electric motor moves the latch mechanism and changes the state reported by the built-in microswitch. Correct operation is essential for door security, alarm systems and interior convenience functions.
How The Part Is Replaced (Overview)
Replacement typically requires removal of the interior door trim and moisture barrier. Steps in brief: disconnect the negative battery terminal for safety; remove door trim clips and screws; peel back the vapour/moisture barrier carefully; disconnect electrical connector and any rod/linkage clips; remove the securing screws for the lock assembly; fit the new unit, reconnect linkages and connector, then test lock/unlock operation before reassembling the door. Basic hand tools and a trim removal tool are usually sufficient. Take care to position rods and clips exactly as removed to ensure correct mechanical travel and switch activation.
Installation Recommendations
- Disconnect the vehicle battery before unplugging the connector to avoid short circuits and unintended actuator movement.
- Mark positions of linkages and retainers before removal to simplify reassembly and ensure correct door handle and lock operation.
- Check the door wiring harness and rubber grommet for damage or water ingress while the door card is off; repair any chafing or broken wires.
- After installation, cycle the central locking several times and verify that the door fully latches, that the interior handle releases correctly, and that the vehicle’s lock indicator signals correctly.
Most Common Failure Reasons
Failures are most often caused by moisture ingress, corrosion of internal gears or linkages, worn motor brushes, or broken plastic components inside the actuator. Water entry from a damaged moisture barrier or rusted drain channels accelerates wear. Mechanical wear can lead to intermittent operation or total lock failure, while damaged linkage clips can prevent the latch from engaging even if the motor functions.
Who Should Fit This Part
Intended for professional fitters and competent DIY mechanics familiar with door trim removal and vehicle electrical systems. If you are experienced with basic automotive repairs and follow the safety recommendations above, this unit can be fitted in a typical home garage. For complex electrical diagnostics or body corrosion issues, professional workshop assistance is recommended.
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