Description
Electric lock for the left rear door for Citroën C4 Picasso and Grand C4 Picasso.
This electric left rear door lock is a direct-fit replacement designed for Citroën C4 Picasso models and Grand C4 Picasso variants. Ideal for professional workshops and DIY mechanics, the unit restores reliable central locking, child lock and mechanical latching functions on the left rear door. Frequently searched by part number 9137H1, this lock replaces worn or failed latch/actuator assemblies to stop door rattles, failure to lock/unlock and intermittent central locking faults.
The assembly combines the mechanical latch with an integrated electric actuator that receives signals from the central locking system. When functioning correctly it secures the door, engages/disengages the lock upon remote or switch command and maintains safe closure under driving loads. Typical failure modes include actuator motor wear, plastic component breakage, corrosion or water ingress and damaged wiring or connectors.
Installation Overview
Replacement requires basic door trim removal and careful handling of linkages and electrical connectors. Typical steps:
- Remove interior door panel and moisture barrier to access the lock module.
- Disconnect the electrical connector and any door switch wiring.
- Unbolt the lock unit from the door structure and detach mechanical linkages (lock rods and child lock lever).
- Fit the new lock, refit linkages ensuring correct engagement, reconnect the wiring and test function (central locking, manual lock/unlock, child lock) before reassembling the door panel.
Technical Information
- Manufacturer: Stellantis (Citroën)
- Model: Citroën C4 Picasso, Citroën Grand C4 Picasso
- Product Codes: 9137H1
- Other Numbers: 9137H1 (search reference)
Recommendations For Installation
- Work on a cool, dry vehicle and keep removed screws and clips organized.
- Inspect and clean the connector pins and apply dielectric grease to prevent corrosion.
- Lubricate mechanical linkages and latch points with suitable grease to reduce wear and noise.
- Check door alignment and striker position after installation to prevent excessive load on the new lock.
- Test all functions (remote locking, interior switch, child lock, manual locking) before refitting the door trim.
Why This Part Commonly Fails
Door lock units fail most often due to actuator motor wear, fatigue or fracture of plastic components, water ingress leading to corrosion, and damaged or loose wiring/connectors. Repeated heavy use, impact from slamming doors and prolonged exposure to moisture accelerate deterioration. Replacing the lock assembly restores reliable locking and prevents further damage to linkage and striker components.
Suitable for professional fitment or experienced DIY mechanics who are comfortable removing door trim and working with vehicle electrical connectors. The part is commonly searched under the code 9137H1—use that reference when locating the correct unit.
