Terminal 30g-f: Bistable relay (depending on variant)

For more information, see general functional description of the power supply:
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SBT Number: -> 61 03 04092

In the 1 Series and 3 Series as of E87, there is a bistable relay for activating terminal 30g-f (depending on variant).

Brief description

The relay terminal 30g-f is only installed with some optional special packages, e.g. when the Car Communication Computer (CCC) has been ordered.
The relay terminal 30g-f switches off in the event of faults on the connected consumer units.

The relay terminal 30g-f is a bi-stable relay and is fitted on the board of the distribution box. The relay is activated by the junction box electronics (JBE).
The bi-stable relay has two relay coils that open or close the relay contact on activation. The relay persists in the last activated position (contact open or closed).

Conditions required for switch-off of terminal 30g-f (failure)
The bi-stable relay is activated by the JBE in the event of a fault in such a way that the power supply for terminal 30g-f is under briefly or permanently.
Terminal 30g-f is controlled under one of the following conditions:

• At <terminal R Off> and after shutdown of terminal 30g, the JBE counted more than 20 wakings (resets).
  After the reset of terminal 30g-f the JBE counts another 5 wakings, terminal 30g-f is switched off permanently.
  
• With <terminal R Off> and 10 min. after shutdown of terminal 30g, the JBE registered control modules that prevent the vehicle from sleeping.
  If the vehicle sleeping is prevented for another 10 minutes after the reset of terminal 30g-f, terminal 30g-f is switched off permanently.
  
• With <terminal R Off>, the power management determined by means of IBS that the battery charge state is close to the starting capability limit.
  

When terminal 30g_f is reset or switched off, it is not taken into account which control module is responsible for the fault. In all cases involving faults, terminal 30g-f is switched off.
If the fault is caused by a control module that is not supplied by terminal 30g-f, the fault remains even after cutoff.

Conditions required for switch-on of terminal 30g-f
A condition for switch-on always has priority over a switch-off condition. Under the following conditions, terminal 30g-f is switched on again via the bistable relay.

• Vehicle is unlocked
  
• Terminal change from <terminal R OFF> to <terminal R ON> or <terminal 15 ON>
  
• Change in a status of door contact, bonnet or luggage compartment lid
  

In the normal case, terminal 30g-f is always switched on.
With <terminal R ON> or <terminal 15 ON>, terminal 30g-f is always switched on.