The most frequent cause is a inside the engine fuse box (BSM). Over years of handling heavy electrical loads, the internal metal contacts of the relay can physically arc and weld themselves together. When this happens, the relay remains permanently closed, constantly pumping +12V down the ignition line. 2. Water Ingress and Corrosion
This code is part of the Peugeot and Citroën manufacturer-specific diagnostic list and is defined as:
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Shortly after turning off and locking the car, the low-beam headlights, sidelamps, and windshield wipers may unexpectedly turn on by themselves.
The unit is easily recognized by its rectangular shape with curved corners, distinct from the larger monochrome dot-matrix displays found in lower trims. It displays data in color, often with an orange/amber or full-color palette depending on the software version. The most frequent cause is a inside the
It is very common for A9B7 to appear alongside other codes.
The underlying cause of an A9B7 fault usually points to one of three hardware failure areas: 1. Corroded or Burned BSM Pins If you share with third parties, their policies apply
would likely appear. Here is the breakdown of what that "story" means for your car: The Culprit
"Fault in the ignition positive relay (+APC) or in the output harness from the relay"
In PSA vehicle electronics, stands for Après Contact , which translates to Ignition Positive (Key-On Power) . When you turn your key or press the start button, the BSI activates an internal or external relay to send power to critical engine management systems, including the Engine Control Unit (ECU). Code Aspect Definition System BSI (Body Control Module) / BSM (Under-hood Fuse Box) Official Description
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