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5 Key Immobilizer & Immobilizer Programming
An immobilizer is an anti-theft mechanism that prevents a vehicle’s engine from starting unless the
correct ignition key or other device is present. Most new vehicles have an immobilizer as standard
equipment. An important advantage of this system is that it doesn’t require the car owner to activate it
since it operates automatically. An immobilizer is considered as providing much more effective anti-theft
protection than an audible alarm alone.
As an anti-theft device, an immobilizer disables one of the systems needed to start a car’s engine,
usually the ignition or the fuel supply. This is accomplished by radio frequency identification between a
transponder in the ignition key and a device called a radio frequency reader in the steering column.
When the key is placed in the ignition, the transponder sends a signal with a unique identification code to
the reader, which relays it to a receiver in the vehicle’s computer control module. If the code is correct,
the computer allows the fuel supply and ignition systems to operate and start the car. If the code is
incorrect or absent, the computer disables the system, and the car will be unable to start until the correct
key is placed in the ignition.
5.1 Key Immobilizer (IMMO)
This function enables you to perform the anti-theft key matching function, so that the immobilizer control
system on the car identifies and authorizes remote control keys to normally use the car.
It needs to be performed in the following cases:
When the ignition switch key, ignition switch, combined instrument panel, ECU, BCM, or remote control
battery is replaced.
5.1.1 Vehicle connection
1). For most vehicles, just use the included diagnostic cable to connect the VCI to the vehicle’s DLC port.
2). For other vehicles (including but not limited to the Mercedes Benz, Volkswagen, BMW and Porsche),
the X-PROG 3/X-PROG is required.
5.1.2 Immobilizer operations
Here we take the BMW for example to demonstrate how to perform the functions of key adding and all
lost for BMW CAS4/CAS4+ Anti-theft system module.
1) Tap IMMO and select BMW to enter the software.
2) Tap OK.
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