Honda Civic 2002-2003 Service Manual page 994

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System Description
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The vehicle is equipped with an immobilizer system that will disable the vehicle unless the proper ignition key is used.
This system consists of a transponder located in the ignition key, an immobilizer control unit-receiver, an indicator
light, and the ECM.
When the key is inserted in the ignition switch and turned to the ON (II) position, the immobilizer control unit-receiver
sends power to the transponder in the ignition key. The transponder then sends a coded signal back to the immobilizer
control unit-receiver which then sends a coded signal to the ECM.
IMMOBILIZER CONTROL UNIT·RECEIVER
\
c===+----+
ECM
IGNITION KEY
(Has built-in transponder)
\
KEY CYLINDER
FUEL SUPPLY
SYSTEM
If the proper key has been used, the immobilizer indicator light will come on for about 2 seconds, then go off.
If the
wrong key has been used or the code was not received or recognized by the unit, the indicator light will come
on for about 2 seconds, then
it
will blink until the ignition switch is turned OFF.
If the ignition switch is turned OFF, the indicator will blink for about 5 seconds to signal that the unit has reset
correctly, then the indicator will go off .
• If the customer has lost his key, and cannot start the engine, contact Honda Customer Relations.
IMMOBILIZER INDICATOR LIGHT BLINKING PATIERN:
IGNITION SWITCH ON
OFF
5
sec
•
-
-
PROPER KEY INDICATOR ON
INSERTED
LIGHT
OFF
~
- -
WRONGKEV
INDICATOR ON
INSERTED LIGHT
OFF
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