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Cold monitoring
The individual bulbs are switched on four times
in short intervals of 500 ms when the ignition is
turned on. The current value allows the onboard
supply control unit to detect a faulty bulb.
Hot monitoring
The individual bulbs are controlled by
semiconductor modules located in the onboard
supply control unit. They recognise whether there
is overloading, a short circuit or an open circuit.
Fault detection
In both monitoring types, an entry is made in the
fault memory and there is an indication in the
dash panel insert when a fault is recognised.
A new bulb is recognised by the monitoring
system, the fault is deleted and the displayed
indication cancelled.
Bulb monitoring
The functioning of the bulbs is monitored constantly. They are monitored while switched off
(cold monitoring) and switched on (hot monitoring).
Electrical system
S328_175
S328_176
S328_177