Directed Electronics 556U, Manual

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1 1 © 2004 Directed Electronics, Inc. N556U 09/04
The 556U immobilizer interface module is used when installing remote start products in vehicles equipped with
an RF (Radio Frequency) based immobilizer system. This type of system uses a small chip imbedded in the igni-
tion key, called a transponder, to transmit a very low powered RF signal. This signal is picked up through an
antenna (or coil) around the ignition switch which is then sent to the immobilizer’s transceiver. Once the correct
signal is received, the immobilizer will enable the ignition and/or fuel systems. If an attempt is made to start
the vehicle and the transceiver does not receive a valid code, the ignition and sometimes the fuel systems are
disabled. The immobilizer system will then render the remote start useless. The 556U bypasses the immobilizer
system only while the remote start is in use, maintaining the factory system’s integrity. When the remote start
system is not in use the factory immobilizer remains fully functional.
R REED D ((+ +)) 1 12 2 V Vo olltt IIn np pu utt:: Connect this wire to a fused source of constant 12V.
B BLLU UEE ((--)) SSttaattu uss IIn np pu utt:: Connect this wire to the remote start negative (-) status output.
P PIIN NK K ((+ +)) IIg gn niittiio on n IIn np pu utt:: Connect this wire to the vehicle’s true ignition output. (Refer to Latching Input, page 7.)
B BLLA ACCK K ((--)) CCh haassssiiss G Grro ou un nd d IIn np pu utt:: Connect this wire to the vehicle’s chassis ground.
V VIIO OLLEETT ((+ +)) K Keeyysseen nssee IIn np pu utt:: Connect this wire to the vehicle’s positive keysense output wire. (Refer to Key Sense
Inputs, page 7.)
G GR REEEEN N ((--)) K Keeyysseen nssee IIn np pu utt:: Connect this wire to the vehicle’s negative keysense output wire. (Refer to Key Sense
Inputs, page 7.)
B BLLA ACCK K aan nd d B BLLA ACCK K//R REED D W Wiirreess:: Both of these are antenna ring wires.
B BLLA ACCK K//W WH HIITTEE:: Refer to alternate wiring diagram.
33--PPiinn H Haarrnneessss
66--PPiinn H Haarrnneessss
PPrroodduucctt DDeessccrriippttiioonn
556U Immobilizer Interface