The windshield wipers, headlights, or dashboard instruments may turn on completely by themselves after you have turned off the vehicle and walked away.
The dashboard may repeatedly display "Economy Mode Active" prematurely due to the vehicle failing to manage its power cycles. Primary Causes of Code A9B7
. While "B7" often refers to the second generation of the Peugeot 308 (built on the EMP2 platform), the combination
Poor power supply can sometimes trigger false electrical codes. Ensure battery terminals are clean and tight. Check the main engine ground strap for corrosion. 4. Use a Diagnostic Tool a9b7 peugeot
The short circuit can keep power running even when the car is turned off. Why Did This Error Code Happen?
Does the engine when you turn the key, or is it completely silent?
Look for signs of heat damage, melting, or corrosion on the relay housing. While "B7" often refers to the second generation
: Low voltage can cause "ghost" faults in the BSI, including A9B7.
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
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. It displays data in color
If the reset doesn't work, a diagnostic tool like or PP2000 is needed to perform an "actuator test" on the ignition relay to see if it physically clicks and functions.
Searching through technical databases, the code is officially defined as a +APC relay fault (short circuit to plus) .