A9b7 Peugeot - !!exclusive!!

Erratically behaving wipers, headlights staying on, or central locking issues can occur if the BSM or BSI is malfunctioning. Potential Causes

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

: The starter motor turns the engine smoothly, but the engine completely fails to fire up because vital sensors and injectors lack key-on power. a9b7 peugeot

When this relay fails or reports this fault, you might notice:

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Turning the key to "OFF" may result in the engine running for a few extra seconds, or refusing to turn off until stalled.

Disconnect the main plug from the BSM that feeds the ignition circuit. Test the wire side, then test the BSM pin side: When this relay fails or reports this fault,

Searching for "a9b7 peugeot" takes you down two distinct, important paths in the world of Peugeot repair and identification.

The failure is almost always mechanical and thermal in nature. The A9B7 unit utilizes a or flex cable connection methodology.

An "Anti-Pollution System Fault" or general electrical failure message often accompanies this code.

Connect a dedicated PSA compatible diagnostic tool (such as Lexia / Diagbox) to check all modules. Take note if code A9B7 is marked as or Intermittent . If permanent, the short is active right now. Step 3: Inspect the Engine Fuse Box (BSM)