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DEI 556L Bypass Module

Most new and late model vehicles have factory anti-theft systems to prevent a vehicle being started without the specific owner's key in the ignition. These factory anti-theft systems provide a valuable service to the vehicle owner helping to prevent a thief from hot-wiring and starting your vehicle. Unfortunately these systems also prevent a remote starter from starting your vehicle, unless you left the key in the ignition, which could easily result in vehicle theft.

Directed Electronics, Inc (DEI), the world leader in remote start technology and factory interface systems, has developed a complete line of 555/556 –series modules that interface with the factory anti-theft systems only during the remote start operation. Therefore the DEI 555/556 series Bypass Modules do not compromise your factory anti-theft system, preserving its integrity, and leaving it fully functional at all other times. DEI Bypass Modules give you the best of both worlds, maintaining the protection of your factory anti-theft system, while enabling you to enjoy the convenience and comfort of a DEI Valet Remote start system.

Of course, you need to use the correct DEI Bypass Module for your specific vehicle. See the DEI Bypass Reference Chart for the correct DEI 555 Series Bypass Module for your vehicle.

The DEI 556L General Motors Passlock Interface Module is used when installing a remote starter in GM vehicles with Passlock I and Passlock II anti-theft systems. The DEI 556L provides an easy way for interfacing a remote starter with the vehicle's factory anti-theft system, while maintaining the integrity of the vehicle's anti-theft system.

The 556L interfaces with the Passlock systems by providing the proper Resistance Code (R-Code) at the appropriate time. The 556L will also provide, when necessary, a negative signal to the "bulb check" wire. The 556L has no effect on the Passlock system when the remote start is not in use, and the factory Passlock anti-theft system will remain fully functional.

DEI 556L Module Guide

The new DEI 556L covers all DEI 555L vehicle applications and includes a built-in relay for compatibility with Colorado, Cobalt, Canyon, and Ion.

  • Works with any aftermarket remote start system
  • Compatible with the factory anti-theft system
  • Maintains the integrity of the factory anti-theft system
  • Resistance code learning
  • Compact design, easy to mount
  • Simple programming
  • No key required for operation
  • All temperature operation


  • One key required for programming.

    DEI 556L Bypass Module




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