Honda Civic Service Manual page 994

System Description
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
l i g h t , a n d t h e E C M .
When the key is inserted in the ignition switch and turned to the ON {ll) 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 ECI\4.
iEl'JUiliii'tlun"oona"|.r KEYCYLTNDER
lf the proper key has been used, the immobilizer indicator light will come on for about 2 seconds, then go off.
lf 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.
lf 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.
lf the customer has lost his key, and cannot start the engine, contact Honda Customer Relations.
IMMOBILIZER INDICATOR LIGHT BLINKING PATTERN:
IGNITION SWITCH ON
OFF
PROPER KEY
INSERTED
INDICATOR
LIGHT
ON
WRONG KEY
INSERTED
INDICATOR
LIGHT
ON
OFF
(| i.,
IMMOBILIZER CONTROL UNIT.RECEIVER
)
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