. If the fuse is good but there is no 12V at the pump, the internal "Double Relay" is likely failed.
Depending on the sub-variant, the B3 may include a serial interface.
: It is common for users to upgrade a B2 to a B3 by soldering the missing internal relay and adding a 15A fuse to the existing PCB locations. Safety & Support
The (Boîtier de Servitude Moteur) is a critical body systems management module used extensively in Peugeot and Citroën vehicles, such as the Peugeot 307 and Citroën C3, C5, and Xsara Picasso . It serves as the primary engine bay fuse and relay box, acting as a gateway that distributes fused power and manages communication between major electrical subsystems. Core Functionality and Architecture
The module consists of two main sections: a high-current fuse area and an electronic board containing the logic. Key components of the B3 schematic include: Integrated Driver (ULN 2003):
. If the fuse is good but there is no 12V at the pump, the internal "Double Relay" is likely failed.
Depending on the sub-variant, the B3 may include a serial interface.
: It is common for users to upgrade a B2 to a B3 by soldering the missing internal relay and adding a 15A fuse to the existing PCB locations. Safety & Support
The (Boîtier de Servitude Moteur) is a critical body systems management module used extensively in Peugeot and Citroën vehicles, such as the Peugeot 307 and Citroën C3, C5, and Xsara Picasso . It serves as the primary engine bay fuse and relay box, acting as a gateway that distributes fused power and manages communication between major electrical subsystems. Core Functionality and Architecture
The module consists of two main sections: a high-current fuse area and an electronic board containing the logic. Key components of the B3 schematic include: Integrated Driver (ULN 2003):
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