Description
Control Unit for Sliding Rear Doors for Citroën C8 and Peugeot 807
Description
This control unit manages the operation of the electric sliding rear doors on Citroën C8 and Peugeot 807 vehicles. It processes signals from door switches, remote control and safety sensors, controls door motor start/stop and anti-pinch functions, and interfaces with the vehicle body electrical system to ensure coordinated opening and closing of the sliding doors. Commonly sought under part numbers 1400745380 and 9138H5, this module is intended for replacement of a faulty or non-responsive sliding door controller.
Technical Information
- Manufacturer: Stellantis (Citroën / Peugeot)
- Model: Citroën C8; Peugeot 807
- Product Codes: 1400745380, 9138H5
- Other Numbers: Not Available
Function And Symptoms
The unit controls the sliding door motor actuation, monitors door position sensors, anti-pinch/photoelectric safety inputs and receives commands from interior switches and the remote locking system. Failure symptoms typically include one or both sliding doors not opening or closing, intermittent operation, doors stopping mid-travel, loss of anti-pinch functionality, or fault codes stored in the vehicle body network.
Why The Part Fails Most Often
Most common causes of failure are water ingress and corrosion of connectors or the module housing, electrical surges from a shorted motor or wiring harness, mechanical wear in the door motor causing overloads, and connector fatigue from repeated removal or poor contact. Environmental exposure (road salt, moisture) and accidental damage from collisions also reduce module reliability.
Replacement Procedure
- Disconnect Battery: Always disconnect the vehicle battery before starting to avoid short circuits and protect vehicle electronics.
- Access Module: Remove interior trim panels in the sliding door area or side pillar to access the control unit—location can vary by model year.
- Unplug Connectors: Carefully release all electrical connectors and any retaining clips. Inspect connectors and wiring for corrosion or damage.
- Swap Unit: Replace the defective unit with the new one, ensuring correct seating and secure fastening.
- Reassembly: Refit trim panels and reconnect the battery.
- Final Checks: Verify door operation and safety functions. Clear any stored fault codes if present.
Installation Recommendations
Due to integration with the vehicle body electrical network, replacement should be performed by a competent mechanic. If the vehicle requires coding or parameterization after installation, use appropriate diagnostic tools. Before removal and installation always disconnect the battery and follow manufacturer procedures to avoid damage to the unit or vehicle electronics. Inspect and, if necessary, repair the door motor, tracks and wiring to prevent immediate repeat failures.
Notes For Professionals And DIY
This control unit is a direct replacement for the sliding rear door system on Citroën C8 and Peugeot 807 models that match the listed product codes. When fitting, check connector pins and seals for corrosion and ensure the door motor does not draw excessive current, which can indicate mechanical binding. Proper diagnosis of the motor and wiring before replacing the control unit reduces the chance of repeated failures.
