E 500 (211.070) V8-5.0L (113.967) (2004)
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Taximeter control unit (A67n1) signals occupied or OFF
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Line to alarm button not faulty
Before each transition into the sleep mode the supply outputs active at circuit 30 ON are subjected to a load assessment.
A check is made as to whether the output can be switched off before the special vehicle multifunction control unit (SVMCU [MSS]) (N26/9) changes
into the sleep mode.
If the connected consumers require a current of < 1 mA, then the internal FET (Field-Effect-Transistor) is switched off in order to lower the current
consumption of the special vehicle multifunction control unit (SVMCU [MSS]) (N26/9). The required load current of a maximum of 1 mA then supplies
a pull-up resistor.
If the current requirement is higher then the FET (Field Effect Transistor) is switched on. Every time the FET (Field-Effect Transistor) is switched on,
the own current consumption in the special vehicle multifunction control unit (MSS) (N26/9) increases by 1.5 mA.
Different wake-up conditions apply to taxis, special-purpose vehicles and vehicles for handicapped persons:
Switching off in the event of undervoltage
The signals for the consumer cutout are put on the CAN interior by the central gateway control unit (N93). The switch-off stages are differentiated
between two priority stages.
The special vehicle multifunction control unit (SVMCU [MSS]) (N26/9) receives the cutout signal, calculates the priority stage and immediately
switches off the appropriate outputs (consumers).
Special signal actuation