Description
Control unit for sliding rear doors for Citroën C8 and Peugeot 807.
Product Overview
This control unit is designed to manage the operation of the sliding rear doors on Citroën C8 and Peugeot 807 models. It controls the door motor, position sensors and safety interlocks to ensure smooth opening and closing, soft-stop behaviour and integration with central locking and vehicle security systems. The part is often searched by its product numbers, so check compatibility by referencing the listed codes.
Key Benefits
- Direct replacement for original sliding-door controllers used on compatible Citroën and Peugeot vehicles.
- Restores automatic sliding-door functions: motor control, end-stop detection and safety reversal.
- Saves workshop time when the module is cloned or correctly initialized and coded.
Compatibility and Typical Applications
Intended for use on:
- Citroën C8
- Peugeot 807
Customers and technicians commonly search using product codes 1400745380 and 9138H5.
How It Is Replaced
- Disconnect the battery before any work on the vehicle electrical system.
- Remove the interior trim of the sliding door or the access cover where the module is located; the unit is typically mounted inside the sliding door cavity or adjacent bodyshell area and fixed with screws or clips.
- Unplug the main connector(s) and remove the unit from its bracket.
- Fit the replacement unit, reconnect the wiring and reassemble trim panels.
- Complete cloning or coding/initialization as required (see Installation and Coding – Important).
Technical Information
- Manufacturer: Stellantis (Citroën / Peugeot)
- Model: Citroën C8; Peugeot 807
- Product Codes: 1400745380, 9138H5
- Other Numbers: No additional numbers available
Installation and Coding – Important
- The unit is used and is “paired” with the original vehicle (VIN/PIN/keys).
- Commissioning options:
- Cloning data from the old unit (EEPROM/Flash) – after cloning the unit is plug and play.
- Virginization and subsequent initialization/telecoding via DiagBox (or online) + key adaptation.
- Recommended to be carried out by a professional with PSA service equipment (DiagBox/Lexia/PP2000).
- Always disconnect the battery before disassembly/assembly and follow the manufacturer’s procedure to avoid damaging the unit.
Recommendations For Installation
- Perform cloning or coding first on a bench only if you have the correct tools and experience; otherwise complete installation and have coding performed with the vehicle connected.
- Inspect door wiring harness, connectors and limit switches while replacing the module — repaired wiring prevents repeated failures.
- Use dielectric grease on accessible connector pins after reassembly to reduce future corrosion risk.
Why This Part Fails Most Often
- Water ingress and corrosion around connectors or inside the door cavity leading to short circuits or intermittent connections.
- Mechanical stress to the wiring harness or damage from door impacts and worn seals.
- Motor stalls or end-stop switch failures that place extra load on the controller, causing overheating or relay/component failure.
- Electrical surges or poor grounding that damage internal electronics.
Symptoms Of A Faulty Unit
- Sliding door does not open or close automatically or operates intermittently.
- Door reverses unexpectedly or fails to detect end positions.
- Error messages or warning lights related to door functions on the instrument cluster.
This description is provided to help professional technicians and experienced DIYers identify and replace the correct module. Always follow safe working practices and manufacturer repair procedures when working on vehicle electrical systems.
