Description
Bosch Airbag Control Unit for Peugeot 207. Fully functional.
This Bosch airbag (SRS) control unit is suitable for Peugeot 207 applications and is often searched by reference numbers—ideal for professional mechanics and experienced DIY enthusiasts looking for a direct replacement part. The unit monitors crash sensors and controls airbag and seatbelt pretensioner deployment, storing event data that can affect reuse. Common search codes for this module are 9666843980 and 0285010702; secondary references include 6546S1, 6546EG and 6546S2.
Technical Information
- Manufacturer: Bosch
- Model: Peugeot 207
- Product Codes: 9666843980, 0285010702
- Other Numbers: 6546S1, 6546EG, 6546S2
Function And Application
The SRS control unit (airbag ECU) continuously monitors inputs from impact sensors, seat occupancy and belt buckle sensors and triggers airbag and pretensioner deployment in the event of a collision. It records crash events and fault codes in non-volatile memory, which can prevent reactivation of the airbag system until the module is serviced or replaced. Compatible primarily with Peugeot 207 variants that use the listed reference numbers.
Replacement And Service Notes
When replacing the airbag control unit follow standard safety and service procedures. Typical steps performed by a competent technician:
- Disconnect the negative battery terminal and wait at least 10 minutes to allow capacitors and SRS circuits to discharge.
- Remove necessary trim and access panels to reach the airbag control module (usually located under the center console or beneath front seats depending on model).
- Unplug connectors carefully—inspect pins and harness for corrosion or damage before fitting the new unit.
- Secure the replacement unit with original mounting points and torque specifications where applicable.
- Clear SRS fault codes and perform required initialization or coding with an appropriate diagnostic tool; ensure the airbag warning lamp extinguishes and that system self-tests pass.
Installation Recommendations
- Always disconnect the battery and wait a minimum of 10 minutes before touching SRS components.
- Handle the unit and connectors carefully; avoid moisture and static discharge. Do not attempt repairs on a corrosion-damaged module.
- After mechanical installation, perform a full diagnostic check and memory clear with PSA-compatible diagnostic equipment (e.g. DiagBox/Lexia) if required by the vehicle.
- Replace any wiring or connector parts that show signs of wear or corrosion to prevent future faults.
Why This Part Most Commonly Fails
- Water ingress and corrosion in connectors or the module housing—common after interior leaks or prior flood damage.
- Electrical surges or short circuits that damage internal electronics or flash memory.
- Physical impact from a collision—after deployment the control unit often records crash data and may require replacement or professional servicing.
- Connector damage or poor repairs following previous service work that lead to intermittent faults or error codes.
