Subsection XX (DIGITALLY ENCODED SECURITY SYSTEM (D.E.S.S.))
DIGITALLY ENCODED SECURITY
SYSTEM (D.E.S.S.)
GENERAL
SYSTEM DESCRIPTION
The ignition key contains a ROM chip with a
unique digital code that is the equivalent of a
unique teeth pattern on a conventional key.
When the ignition key is turned ON, the ECM
reads the ignition key and, if it is not recognized,
no engine starting will be possible.
NOTE:
When a key is not recognized by the ECM,
INVALID KEY will be displayed in the multifunction
speedometer.
NOTE:
All ignition keys have the same teeth
pattern. Therefore, they can be used and turned
in the switch of any D.E.S.S.-equipped vehicle.
However, unless the D.E.S.S. system recognizes
(in the ECM) a valid programmed key, the engine
starting will not be allowed.
NOTE:
Actually, it is the memory of the ECM that
is programmed to recognize the digital code of the
ignition key.
Up to 10 ignition keys may be programmed in the
memory of the ECM. They can also be erased in-
dividually or all at once.
Note that the D.E.S.S. circuitry is already activated
on all new ECM.
TROUBLESHOOTING
DIAGNOSTIC TIPS
NOTE:
It is a good practice to check for fault
codes using B.U.D.S. as a first troubleshooting
step.
If D.E.S.S. key is not recognized by the ECM, key
is defective or there is a wiring problem, CHECK
ENGINE light will turn on and a message will be
displayed in the multifunction speedometer.
PROCEDURES
KEY PROGRAMMING
1. Connect to the latest applicable B.U.D.S. ver-
sion. Refer to
COMMUNICATION TOOLS AND
B.U.D.S.
subsection.
2. Turn ignition switch to ON using any of the key
provided with the vehicle. DO NOT start the
engine.
3. Click the
Read Data
button in B.U.D.S.
vmr2006-012-100_aen
4. Click on
Keys
tab.
tmr2011-029-001
KEYS TAB
5. Click on
Erase All Keys
button.
tbl2011-001-052_a
1. Click here to erase all keys
6. Click "YES" to confirm the action.
7. Check the color of the key to be programmed.
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