SYSTEM OPERATION
TSB Revision
WIRELESS CONTROL MODULE (WCM)
42C-7
ENCRYPTED CODE
Four data codes are transmitted when a switch is
operated once. The encrypted code for user identifi-
cation is a combination of 0 and 1, and more than 1
million different combinations are available. To pre-
vent theft by copying signal codes, the data code
includes a rolling code with the encrypted code. The
rolling code changes each time a signal is sent.
.
RECEIVER
The receiver is incorporated into the receiver
antenna assembly together with the receiving
antenna. The receiver outputs the signal which the
antenna received from transmitter to WCM, and
WCM compares it with the registered encrypted
code. Only when the signal and the code match, a
signal is output from WCM to ETACS-ECU. By con-
necting the scan tool MB991958 (M.U.T.-III
sub-assembly) to the data link connector, encrypted
codes of up to eight transmitters can be registered.
NOTE: IA transmitter can be added without using the
scan tool. <USA only>
.
FUNCTION FOR CONFIRMING RECEIVER
ANTENNA ASSEMBLY OUTPUT AND
OPERATION
When WCM receives an electric wave signal of the
identification code (lock/unlock signal) stored in
WCM, WCM outputs the lock/unlock signal to
ETACS-ECU. When the lock/unlock signal is input,
ETACS-ECU outputs the lock/unlock signal and, at
the same time, notifies using the light and horn that
the keyless entry is operated (answerback). The ini-
tial setting at factory for the answerback function is
as following table. Using a customization feature, the
answerback function can be changed (Refer to
P.42C-14
).
FUNCTION TABLE FOR CONFIRMING KEYLESS ENTRY OPERATION (DEFAULT)
.
AC508281AB
ON
OFF
Transmitter lock or unlock button
Data
code
Item
Operation
Doors locked
Doors unlocked
ETACS-ECU (WCM)
Sends lock signal
Sends unlock signal
Dome light
Flashes once
Illuminates for 15 seconds
Turn-signal lights (RH and LH) Flashes once
Flashes twice
Horn
Sounds once if doors are already
locked
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