Overview

This electric door lock is designed as a direct replacement for the left rear door on Citroën C4 Picasso and Grand Picasso models. It restores reliable central locking operation, secures the rear passenger door and integrates with the vehicle’s original locking rods and electrical connector. Frequently searched under product numbers, this part is intended for professional mechanics and experienced DIY enthusiasts who perform door module and lock repairs.

Function

The lock assembly contains the mechanical latch and an electric actuator that receives commands from the central locking system to lock or unlock the door. It also incorporates microswitches that signal the body control module about the door’s open/closed and locked/unlocked status. Proper function ensures safe door closure, child-lock operation (where applicable) and correct interaction with alarm and central locking systems.

Compatibility

Compatible With: Citroën C4 Picasso, Citroën Grand Picasso. This unit fits the left rear door (door behind the driver). Searches for the part often use the following reference numbers: 9137H1, 9137H124090158, 24089158, 24092158, 24090158.

Technical Information

• Manufacturer: Citroën / Stellantis
• Model: Citroën C4 Picasso, Citroën Grand Picasso
• Product Codes: 9137H124090158, 9137H1
• Additional Numbers: 24089158, 24092158, 24090158

Replacement Instructions

1. Disconnect the negative battery terminal before starting work.
2. Remove the interior door trim and any waterproof membrane to access the lock assembly.
3. Unplug the electrical connector and release the locking rods/clips linked to the latch (note positions for reassembly).
4. Unscrew the lock retaining bolts and remove the old unit from the door shell.
5. Install the replacement lock, secure bolts to the correct torque, reconnect rods and the electrical connector.
6. Test locking/unlocking functions and door position switches before refitting the door trim.

Installation Tips

Use appropriate tools (Torx/sockets/trim tools) and keep small clips and fasteners organized. Test the actuator and microswitches with the connector connected but door trim removed to confirm correct operation. Lubricate the latch points with a light specialist grease and check the striker alignment if the door does not close smoothly. Always ensure connectors are clean and dry; replace any cracked plastic clips or damaged wiring.

Why This Part Fails

Common causes of lock failure include moisture ingress and corrosion, wear of internal plastic gears or levers, electrical motor or microswitch failure, impact damage from door slams or accidents, and broken linkage clips. Symptoms of a failing lock are intermittent or complete loss of locking/unlocking function, unusual grinding or clicking noises from inside the door, or the door failing to latch securely.

Useful Notes

Mechanics and DIYers often search by the part numbers listed above to ensure they obtain the correct unit. Follow safe workshop practices during replacement and verify full function of central locking and door switches after installation.