Closed-Circuit Current Monitoring (Standby Current)

When terminal 0 is active, the PM switches over to closed-circuit current monitoring after 60 minutes. If an operation is performed on the car before 60 minutes has elapsed (e.g. central locking, trunk opened), the timer starts from the beginning again.

Once that period has ended, the closed-circuit current should not exceed 80 mA. If the closed-circuit current exceeds 80 mA, after 5 minutes the PM issues the "Shutdown counter" message. After a further 90 seconds, the vehicle's electrical system is shut down for 5 seconds.

If the quiescent current still exceeds 80 mA when the system is switched on again, the sequence described above is repeated. If the quiescent (sleep) current is then still over 80 mA, the system is permanently shut down via the electronic battery master switch.

The fault is recorded in the Power Module's fault memory (with details of environmental conditions and cause).

When the signal "15w" from the CAS is detected, the electronic battery master switch is closed and the following Check Control message is displayed:

Closed-circuit current monitoring is automatically cancelled by a message from the LM that the hazard warning lights are active.

When terminal R is switched off, current monitoring is also immediately activated. Normal current load on the vehicle drops in stages according to the vehicle programming for sleep mode (see Figure ).

If the monitored current is more than 120 amps (even as a random spike), the interior lighting, roof area consumers and body zone consumer circuits are immediately switched off.