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© 2006 Directed Electronics
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
555L immobilizer bypass module available at your local retail
dealer. The majority of transponder-based immobilizer systems
can be bypassed using the 555U or 556U immobilizer bypass
module available at your local retail dealer.
The BLUE wire (H1/1) of the primary harness supplies a
200mA output as soon as the control module begins the remote
start process. This wire can be used to activate an immobilizer
bypass unit.
note: This unit requires you to use one of your factory keys.
You may want to acquire another key from the dealer.
note: Any vehicle equipped with a factory 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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