Airbag unit Citroën C8 Peugeot 807 1400987180 6546H0

Description

Airbag unit for CITROEN C8 and PEUGEOT 807 cars
Fully functional

Part description

This airbag unit (SRS control unit) is designed for Citroën C8 and Peugeot 807 cars. It is a key safety element that evaluates signals from the system and controls the activation of the airbags and belt pretensioners. If you are dealing with a replacement after a defect or after an intervention in the system, the correct part number is essential when choosing – it is most often searched for by the designation 1400987180 or 6546H0.

The part is offered as used and according to the documents it is fully functional.

Technical information

• Manufacturer: Stellantis
• Model: Citroën C8; Peugeot 807
• Other numbers: 6546H0, 6546H1

Product codes

• Product codes: 1400987180, 6546H0

Installation recommendations

Generally/typically for airbag control units (SRS), installation requires careful adherence to safety procedures. The exact steps may vary depending on the specific car model.

1) Before assembly

• Compare with the old part all numbers and markings: 1400987180, 6546H0 (or other listed).
• Check the condition of the connectors: there must be no damaged locks, bent pins, traces of corrosion or moisture.
• Inspect the body of the unit for cracks, deformations and traces of improper intervention.

2) Necessary tools and materials

• Normal set of hand tools (ratchet/bits/screwdrivers depending on design)
• Cleaning agent for electrical contacts (as needed)
• Diagnostics compatible with PSA (for checking and possible deletion of defects – depending on the situation)

3) Step-by-step assembly procedure

1. Turn off the ignition, secure the vehicle against movement.
2. Disconnect the battery and wait for the prescribed time to safely disconnect the system (according to the manufacturer’s procedure).
3. Access the airbag unit according to the vehicle design (removal of covers/covers only to the extent necessary).
4. Disconnect the electrical connectors carefully – do not pull on the wiring, release the connectors/latches.
5. Dismantle the old unit and check its mounting (mounts, screws, possible damping elements) for damage.
6. Before installation, clean the contact surfaces and check that no dirt or moisture has entered the connectors.
7. Mount the unit in its original location and fix it in the same way as the original piece.
8. Connect the connectors so that they are fully seated and properly secured with fuses.
9. Reassemble the dismantled covers and interior parts according to their original condition.
10. Connect the battery.
11. Turn on the ignition and observe the system lights (safely, without handling the connectors with the ignition on).
12. Perform a diagnostic check of the system and verify the status of defects (typically check/delete depending on the possibilities and the condition of the vehicle).
• 4) Post-assembly checks and test drive/function verification
  • Check that the connectors are firmly secured and that the wiring is not pinched anywhere.
  • Check if the SRS/airbag warning light comes back on (if present in the car).
  • After a short verification of operation, recheck any stored faults with diagnostics (if available).

  5) The most common assembly mistakes + how to avoid them

  • Work without disconnected battery → always disconnect and observe the safety delay according to the manufacturer.
  • Non-seated connectors / unsecured fuses → snap the connectors in as far as they will go and check for locking.
  • Pulling on the wiring → handle only by the body of the connector.
  • Moisture and corrosion in the connectors → visual inspection, possibly gently cleaning the contacts.

  Reasons why the part is damaged

  • After an accident or the activation of safety features (depending on the system configuration, the event may be recorded and subsequent problems may occur).
  • Voltage fluctuations in the on-board network (weak battery, bad grounding, inappropriate disconnection/connection).
  • Intrusion of moisture into the interior and subsequent corrosion of connectors or electronics.
  • Incompetent handling of bundles and connectors (damaged pins, broken locks).
  • Defects in related system elements (cabling, connectors), which can cause repeated errors and load the electronics.