Directed Electronics 259D - Manual (Page 28)

25 © 2 0 0 2 d i r e c t e d e l e c t r o n i c s , i n c .
step 9
Immobilizer Bypass Modules
Most newer vehicles have a factory engine immobilizer system
designed to prevent any unauthorized use of the vehicle. These
immobilizers will cut off power to the starter and the fuel supply
preventing a thief from starting the vehicle.
There are several types of immobilizers, with the most common
being the resistance based passlock/passlock 2 systems found on
most newer GM vehicles. This system can be bypassed using the
557L immobilizer bypass module available at your local retail
dealer. The majority of transponder-based immobilizer systems
can be bypassed using the 557U immobilizer bypass module
available at your local retail dealer.
To determine what bypass module your vehicle requires, check
your web vehicle information sheet.
warning! Any vehicle equipped with a fac-
tory immobilizer must use an immobilizer
bypass module to remote start. If not used,
the vehicle ignition or fuel supply circuits
could lock up and require a costly trip to
the dealer to reset the computer system.
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