Electrical Power Supply In The Event Of A Crash

If the vehicle voltage falls below approx. 8 V, the switching controller (7)  uses the reserve voltage from the capacitor.

The switching controller provides operating power to replace the missing voltage from KL 30 until the capacitor is fully discharged or the vehicle voltage is restored.

Operation of the switching controller is controlled by the microprocessor across the cable SHDN2. If KL R is off, the switching controller is switched off again, but there is no discharge of the memory backup capacitor.