This sliding rear door control unit (ECU) is a direct-fit electrical module designed for Citroën C8 and Peugeot 807 vehicles equipped with powered sliding rear doors. Built to manage motor control, door position sensors and safety interlocks, it restores reliable automatic opening/closing and integrates with central locking and anti-pinch systems. Ideal for professional workshops and experienced DIY mechanics who search by product number (e.g. 1400500180, 9138H4).

Technical Information

• Manufacturer: Stellantis (Citroën / Peugeot)
• Model: Citroën C8; Peugeot 807
• Product Codes: 1400500180, 9138H4
• Additional Numbers: 1488780080, NFP

Fitment And Compatibility

Compatible with Citroën C8 and Peugeot 807 models equipped with electrically operated sliding rear doors. Always confirm fitment against the product codes listed above and the physical connector arrangement on the vehicle. This unit is typically mounted in the sliding door assembly or adjacent B-pillar area depending on body trim.

Function And Purpose

The control unit regulates the sliding door motor, reads limit and position switches, interprets anti-pinch and safety sensors, and communicates with the vehicle’s central locking systems. It ensures smooth, timed opening/closing sequences and interrupts movement when an obstruction is detected to prevent injury or damage.

Replacement Procedure

1. Disconnect the vehicle battery before any work to avoid electrical damage and unintended activation.
2. Remove interior door trim panels and any protective covers to access the module and wiring connectors.
3. Label and disconnect the electrical connectors and detach any linked cabling or actuator linkages.
4. Unbolt the control unit, replace with the new unit and secure it in the original mounting position.
5. Reconnect all plugs, reassemble trim and reconnect the battery. Perform functional tests: door open/close cycles, anti-pinch operation and central locking response.

Installation Recommendations

Use correct trim tools to avoid damage to panels and clips. Check connector pins and wiring for corrosion or damage before installing the replacement unit. After installation verify mechanical door travel, limit switch calibration and sensor operation. If diagnostic equipment is available, read fault codes and clear them after successful replacement.

Why The Part Commonly Fails

Common failure causes include water ingress and corrosion of connectors, wear from repeated use, short circuits caused by damaged wiring, and failures of onboard relays or electronic components due to voltage spikes. Mechanical impacts or door alignment issues can also overload the module by causing repeated stall conditions.

Recommended Diagnostics

Begin troubleshooting by checking fuses, wiring continuity and connector condition. Use a diagnostic scanner to read error codes related to door motors, sensors and body control functions. Inspect door rails, rollers and latches for binding that can place extra load on the motor and control unit.

For Who

Designed for professional mechanics and competent DIY enthusiasts who are familiar with electrical diagnostics and door mechanism servicing. The product codes included in this listing make it easy to locate the correct replacement part.

Product Description

This genuine used control unit manages the electrical operation of the sliding rear doors on Citroën C8 and Peugeot 807 models. It Controls Motors, Door Position Sensors, Safety Inhibitors And Interlocks, Ensuring Smooth Opening/Closing, Obstacle Detection And Synchronisation With Central Locking And Interior Switches. Ideal For Professional Workshops And Do-It-Yourself Mechanics Looking To Restore Reliable Sliding-Door Functionality.

Key Benefits

• Direct Fit For Listed Models: Uses Original Manufacturer Part Numbers For Easy Identification.
• Restores Full Door Functionality: Ensures Motor Control, End-Of-Travel Limits And Safety Cut-Outs Work Correctly.
• Time-Saving Replacement: Plug-In Electrical Connections Reduce Workshop Labour Time When Installed Correctly.
• Suitable For Mechanic And Enthusiast Use: Clear Installation And Coding Paths For Professional Recommissioning.

How It Works And Typical Faults

The unit Regulates Power To The Sliding-Door Motor, Reads Limit Switches And Sensors, And Communicates Lock/Unlock Status To The Vehicle Network. The Most Common Causes Of Failure Are Water Ingress And Corrosion Of Connectors, Impact Or Mechanical Damage To The Door Mechanism, Short Circuits In Wiring Or Intermittent Faults In Internal Electronics Caused By Age Or Vibration. Fault Symptoms Include Unresponsive Door Motor, Intermittent Opening/Closing, Safety Cut-Outs Triggering Incorrectly, Or Complete Loss Of Door Control.

Replacement And Service Notes

General Replacement Steps (Summary):

• Disconnect The Battery Before Starting Work To Avoid Short Circuits And Protect The Unit.
• Remove The Interior Trim Panels To Access The Sliding-Door Control Unit; Keep Fasteners Organised.
• Unplug All Electrical Connectors Carefully And Note Any Retaining Clips Or Seals To Ensure Water Tightness On Reassembly.
• Swap The Unit, Reconnect Harnesses, Refit Trim Panels And Reconnect The Battery.
• Perform Coding Or Data Transfer As Required (See Installation And Coding – Important).

Installation And Coding – Important

– The Unit Is Used And Is “Paired” With The Original Vehicle (VIN/PIN/Keys).
– Options For Commissioning:
1) Cloning Data From The Old Unit (EEPROM/Flash) – After Cloning The Unit Is Plug And Play.
2) Virginization And Subsequent Initialization/Telecoding Via DiagBox (Or Online) + Key Adaptation.
– Recommended To Be Performed By A Technician With PSA Service Equipment (DiagBox/Lexia/PP2000).
– Always Disconnect The Battery Before Removal/Installation And Follow The Manufacturer’S Procedure To Avoid Damaging The Unit.

Recommended Workshop Advice

Check The Door Mechanism And Wiring Harness For Signs Of Water Ingress, Corrosion Or Mechanical Binding Before Replacing The Module. Replace Any Damaged Seals, Clean Connector Pins And Apply Dielectric Grease To Prevent Future Corrosion. If The Fault Is Intermittent, Consider Cloning The Original Module Data To The Replacement Unit To Preserve Learned Limits And Behaviour.

Why This Part Fails Most Often

Failures Commonly Result From Water And Moisture Penetration Into Connectors Or The Module Housing, Corrosion Of Electrical Contacts, Damage From Impact Or Excessive Strain On Door Linkages, And Age-Related Electronic Component Degradation. Faults Are Also Frequently Triggered By Wiring Harness Damage At Door Hinges Or Sliding Rails Where Movement Causes Wear.

Technical Information

• Manufacturer: Stellantis (Citroën / Peugeot)
• Model: Citroën C8; Peugeot 807
• Product Codes: 1488780080; 1400500180; 9138H4
• Additional Numbers: NFP

Compatibility And Notes

Part Numbers And Vehicle Fitment Shown For Quick Reference. Ensure That The Replacement Unit Matches The Required Part Numbers Listed Above. For Proper Commissioning After Fitment, Use The Recommended Diagnostic Procedures To Clone Or Initialize The Module So All Door Functions And Key Adaptations Work Correctly.