freightliner CENTURY CLASS S Driver Manual page 57

Vehicle Access
If the ALERT button is pressed, the ECM executes
the unlock sequence and also activates the vehicle
alarm functions (see above). To cancel an ALERT (to
turn off the alarm), press the UNLOCK button.
Once activated, the alarm sequence continues for 30
seconds unless deactivated by pressing the UN-
LOCK button on the fob. After 30 seconds in the
alarmed state, the system automatically enters the
violated state.
In the violated state, the horn does not sound and
the cab marker lights do not flash, but the engine is
still immobilized and the LED continues to blink at
the fast rate. The vehicle remains in this state until
the UNLOCK button is pressed.
Fob Programming
The security system ECM can store up to four fob
identification codes. Once the first fob has been pro-
grammed, there are never any vacant memory loca-
tions.
IMPORTANT: As a security measure, all fobs
must be coded during the same programming
sequence. The first fob code is stored in all four
memory locations. Taken together, these ensure
that only the vehicle owner's fobs can be pro-
grammed into the system. If additional fobs are
programmed, they overwrite the original code in
locations two, three, and four, in that order.
The ECM provides a 20-second time period to pro-
gram each fob. If the fob is not programmed within
this time span, the system will exit the programming
sequence.
After each valid code storage sequence, the system
LED will indicate the completion of a learning cycle
by turning off the LED for approximately 0.5 second,
and unlocking the doors.
To program a fob, do the following steps:
1. With the ignition keyswitch turned off, turn the
program switch ON (flip the toggle DOWN). See
Fig. 3.11.
2. Now turn the ignition keyswitch on. Note that the
system LED illuminates continuously. See
Fig. 3.10. This indicates that the ECM is ready to
begin the learning sequence.
NOTE: If the LED does not illuminate continu-
ously at this point, repeat the first two steps.
3.9
3. On the fob, press down both the LOCK and UN-
LOCK buttons at the same time and hold them
down for at least three seconds. See
the code was learned, the system LED flashes
and the doors unlock.
IMPORTANT: If no valid code was received, the
system does not erase any stored data in that
memory location. This is a security measure to
ensure that a fob ID cannot be erased acciden-
tally.
4. Repeat the above step to program additional
fobs, up to a total of four.
5. When the programming sequence is over, return
the system to normal operation by turning the
program switch OFF (flip the toggle UP).
Fob Battery Replacement
1.
Open the battery cover on the back of the fob
with a suitable coin or other thin piece of metal.
Twist off the cover. See
10/22/96
1. Fob
2. Battery
Fig. 3.12, Fob Battery
2. Remove the battery and the O-ring installed in-
side the cover. Save the O-ring for later installa-
tion.
IMPORTANT: The battery may contain perchlor-
ate material; special handling may apply, see
www.dtsc.ca.gov/hazardouswaste/
perchlorate.
3. Install the new battery, as follows.
Fig. 3.9. If
Fig. 3.12.
1
2
3
4
f541446
3. O-Ring
4. Battery Cover