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E90 General Vehicle Electrical
Identification Transmitter
The identification transmitter for Comfort Access must be actuated by means of a coded
125 kHz radio signal that is transmitted from the Electronic Outer Door Handle Module or
exterior antenna. The coded 125 kHz radio signal enables the ID transmitter to transmits
a coded 315 MHz high frequency validation signal that is received by the remote control
receiver and forwarded to the CAS2, which determines if the ID Transmitter as valid and
belongs to the vehicle.
The ID transmitter is exclusively responsible for use/operation of the Comfort Access
System.
The ID transmitter does not need to be operated to enable access to the vehicle, it simply
needs be carried on the person that is accessing/operating the vehicle.
The ID transmitter for Comfort Access uti-
lizes a replaceable battery, which is the
identifiable difference when compared to
the regular remote control that has an inte-
grated rechargeable battery. The ID trans-
mitter for Comfort Access does not need to
be inserted in the holder in order to start the
vehicle it just needs to be located in the
interior of the vehicle in order to start the
engine.
The service life of the battery in the ID
Transmitter is about 2 years.
Voltage Monitoring
The ID Transmitter monitors its own battery voltage in two stages:
• First stage the ID Transmitter signals to the CAS2 that the battery is "flat" (dis-
charged). In response, the CAS 2 generates a check control message. The check
control message informs the customer that the battery needs to be changed.
• Second Stage if the battery is not changed, the voltage monitoring facility initiates a
function which saves the data in the ID Transmitter is saved and then ID Transmitter
is set/made "inoperable".
Index Explanation
1
Unlock Button for Mechanical Key
2
Battery Compartment
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