Directed Electronics 556U Manual

Immobilizer interface

Hide thumbs

Table Of Contents

P P r r o o d d u u c c t t D D e e s s c c r r i i p p t t i i o o n n

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.

6 6 - - P P i i n n H H a a r r n n e e s s s s

R R E E D D ( ( + + ) ) 1 1 2 2 V V o o l l t t I I n n p p u u t t : : Connect this wire to a fused source of constant 12V.

B B L L U U E E ( ( - - ) ) S S t t a a t t u u s s I I n n p p u u t t : : Connect this wire to the remote start negative (-) status output.

P P I I N N K K ( ( + + ) ) I I g g n n i i t t i i o o n n I I n n p p u u t t : : Connect this wire to the vehicle's true ignition output. (Refer to Latching Input , page 7.)

B B L L A A C C K K ( ( - - ) ) C C h h a a s s s s i i s s G G r r o o u u n n d d I I n n p p u u t t : : Connect this wire to the vehicle's chassis ground.

V V I I O O L L E E T T ( ( + + ) ) K K e e y y s s e e n n s s e e I I n n p p u u t t : : Connect this wire to the vehicle's positive keysense output wire. (Refer to Key Sense

Inputs , page 7.)

G G R R E E E E N N ( ( - - ) ) K K e e y y s s e e n n s s e e I I n n p p u u t t : : Connect this wire to the vehicle's negative keysense output wire. (Refer to Key Sense

Inputs , page 7.)

3 3 - - P P i i n n H H a a r r n n e e s s s s

B B L L A A C C K K a a n n d d B B L L A A C C K K / / R R E E D D W W i i r r e e s s : : Both of these are antenna ring wires.

B B L L A A C C K K / / W W H H I I T T E E : : Refer to alternate wiring diagram.

556U Immobilizer Interface

1 1

N556U 09/04

Table of Contents

Summary of Contents for Directed Electronics 556U

Page 1 P P r r o o d d u u c c t t D D e e s s c c r r i i p p t t i i o o n n The 556U immobilizer interface module is used when installing remote start products in vehicles equipped with an RF (Radio Frequency) based immobilizer system.
Page 2 In this case, it would be necessary to remove the already programmed key from the 556U module to reprogram it. (If the customer plans on having additional keys programmed to the vehicle in the future, the shaft of the key should not be altered.)
Page 3: Standard Interface
2. Reassemble the control module. This will secure the key inside. I I M M P P O O R R T T A A N N T T ! ! When using the ring method of installing the 556U, the ring from the 556U MUST be in front of the factory receiver ring.
Page 5 A A l l t t e e r r n n a a t t e e I I m m m m o o b b i i l l i i z z e e r r I I n n t t e e r r f f a a c c e e N N o o . . 1 1 This type of interface will only work with immobilizer systems that have a two-wire factory antenna harness.
Page 6 4. Plug the three-pin connector into the 556U module and cut the 556U’s antenna wire off. Discard the antenna ring. 5. Split open the factory transponder ring tube and cut one of the two wires in half. 6. Connect the factory transponder ring side of the cut wire to the BLACK/WHITE normally closed input wire of the 556U.
Page 7 A A l l t t e e r r n n a a t t e e I I m m m m o o b b i i l l i i z z e e r r I I n n t t e e r r f f a a c c e e N N o o . . 2 2 This type of interface will only work with immobilizer systems that have a two-wire factory antenna harness.
Page 8 The 556U is shipped with the jumper set in a 60 winding position (mode 2). For most applications this should be the optimal setting. Moving the jumper will set the 556U to work off of a 18 winding position (mode 1). You may use the 18 winding for American and Asian vehicles, but for European vehicles the 60 winding setting is required.

Directed Electronics 556U Manual

Table of Contents

Related Manuals for Directed Electronics 556U

Summary of Contents for Directed Electronics 556U

Page 3: Standard Interface

Table of Contents