The main "brain" or body control module located in the passenger compartment. BSM (Under-Bonnet Fuse Box):
If the differential pressure sensor wiring shows a short to ground (often from rubbing on the subframe), the ECU will disable regeneration and trigger a "Risk of DPF Clogging" warning. Use the diagram to verify the 5V reference from the ECU (pin E7 for sensor supply). peugeot 407 2.0 hdi wiring diagram
A generic diagram won’t cut it. You need the specific diagram for the engine code linked to the BSI. The main "brain" or body control module located