The red battery light on the the dashboard flashes to warn the user that the car has entered 'economy mode'
Economy mode or 'Eco Mode' is activated by the car computer (BSI) to save the battery power when the ignition has been left on and the engine not yet started. To reset ECO mode and clear the flashing battery light, start the engine.
The usual faults with ECO mode won't reset are: 'Engine turns over, but won't start' or 'Car won't start'. The way to diagnose this is to ignore ECO mode resets and focus on starting the engine. Check the usual suspects, fuses, immobiliser chip, fuel pressure, starter motor etc..... Fix the engine and ECO mode will reset and the battery light will stop flashing.
In order not to run down the battery, when the engine is stopped, your vehicle passes automatically into economy mode after approx. 30 minutes of use of one or more electrical components.
Electrical components relating to comfort are automatically cut off.
To reactivate them, it is necessary to restart the engine.
Note: When changing to economy mode, the battery charge warning lamp starts to flash.