30G Switch Off Conditions

30g Switch Off Conditions
The switch-off conditions for terminal 30g relay are as follows:
^ 60 min after terminal R OFF or
^ Service applications
^ Power Management Switch off



Micro-Power Module





In the same way as with terminal 30g, the micro-power module (MPM) facilitates defined deactivation of electric loads.
The MPM is installed in the spare wheel recess and operates in 3 modes, normal mode, sleep mode and service mode

Normal Mode
All functions of the MPM are available in normal mode. The MPM switches on/off the voltage supply to the electric loads involved in communication. Loads are switched on and off only when a fault occurs during the vehicle rest period. The MPM switches the voltage supply on and off in the following control units:
^ Multi-audio system controller MASK
^ Car communication computer CCC
^ CD disc changer CDC
^ DVD changer DVD
The supply voltage is switched on and off by means of a bi-stable (switchover type) relay. The relay is set to "ON" when it leaves the factory. This type of relay has two positions, On and OFF. When ON voltage is passed from Fuse 57 through the MPM to the above consumers. When OFF, the connection to F57 is broken. This type of relay does not need power (coil energized) to maintain either switch position. Power is only needed to cause the relay to switch from ON to OFF or OFF to ON.





Switch on/off conditions for micro-power module

The MPM communicates with the vehicle through the K-CAN and is supplied power by both a KL 30 and a KL 15. If terminal 30 voltage is lost, operation continues with the voltage supplied by terminal 15, and a fault is registered.

Sleep Mode
The MPM assumes sleep mode approximately1 s after the K-CAN has gone into sleep mode. The current switching status of the relay is stored before the MPM assumes sleep mode.
The MPM is woken by the terminal 15 signal via the K-CAN or by activation of terminal 15. On waking, the switching status of the relay last stored is reestablished.

Service Information for MPM
A fault code is stored in the fault code memory when the MPM disconnects the electric loads from the vehicle electrical system. The following fault codes can be read out in diagnosis:
^ Terminal 15 fault
^ Deactivation with information on the switch-off condition
The information on the switch-off condition is stored in the info memory:
^ Undervoltage
^ Contact fault of relay contacts



Alternator
Bosch and Valeo alternators are installed in the E60. The alternators are fitted depending on the type of engine and equipment configuration. They differ with regard to their rating of 140 A and 170 A and are air-cooled.

Digital Motor Electronics





The power management software is contained in the DME. When the vehicle is at rest, the IBS is partially responsible for power management.
The tasks of the power management system include:
^ Adaptation of the alternator charging voltage
^ Idle speed boost for increasing the power output of the alternator
^ Reduction of peak loads in the event of a shortfall in coverage provided by the vehicle electrical system
^ Deactivation by means of bus messages of electric loads such telephone, on reaching the start capability limit of the vehicle
^ Closed-circuit current diagnosis

Variable Battery Charging Voltage
The variable battery charging voltage on system ensures improved charging management of the battery in unfavorable driving situations. The power management controls the temperature-dependent voltage for the charging voltage of the alternator via the BSD line.

Idle Speed Boost
The idle speed can be increased in situations where the battery does not cover power requirements. When the specified voltage alone is no longer sufficient, the DME boosts the idle speed corresponding to the engine status.

Reducing Peak Loads
The peak load of the vehicle electrical system is reduced when there is still a shortfall in battery coverage despite boosting idle speed. Peak load reduction is realized by:
^ Reducing power output, e.g. by correspondingly controlling the clock cycles of the rear window defogger
^ If reducing the power output is not sufficient, individual electric loads can be switched off in extreme situations

Electric Load Cutout
The electric loads in the E60 are divided into the following categories:
^ Comfort loads, e.g. window defogger, seat heating, steering wheel heating
Electric loads switch off automatically after engine OFF. These electric loads can be activated again after the vehicle has been restarted.
^ Legally required auxiliary electric loads, e.g. side lights, hazard warning lights
Legally required auxiliary loads must be operational for a certain period of time after engine OFF. These legally required electric loads are not switched off even on reaching the start capability limit of the battery.
^ Auxiliary electric loads, e.g. independent ventilation, communication components such as central information display, telephone, telematic services
Auxiliary loads can be switched on after engine OFF. The comfort electric loads switch off automatically on reaching the start capability limit of the battery. Switch-off is requested by the DME in the form of a CAN message.
^ System-related after running loads, e.g. electric radiator fan
System-related after running loads can maintain operation for a defined period of time.

Data Transfer to the IBS
The following data are transferred via the BSD to the IBS before the DME assumes sleep mode:
^ State of charge of the battery SoC
^ State of health of the battery SoH
^ Outside temperature
^ Available discharge level
^ Terminal 15 wake-up enable
^ Terminal 15 wake-up disable
^ DME close

Closed-Circuit Current Diagnosis
A fault code is stored in the DME when the battery current exceeds a defined value during the vehicle rest phase. The vehicle should be analyzed accordingly.

Terminal 30g Relay
The terminal 30g relay is actuated by the CAS at an excessively high closed-circuit current or on reaching the start capability limit of the battery.