SsangYong Rodius (2013 year). Manual - part 120

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7010-06

2) System Diagram

The certification for the immobilizer is performed when turning the ignition switch to the "ON" position 

after the CAN communication between the ECU and immobilizer is established.

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2. OVERVIEW

The Immobilizer System provides an additional theft deterrent to the vehicle in which it is installed and 

prevents it from being started by unauthorized persons. The transponder integrated in the key and the 

engine control unit have the same code. When the ignition key with the integrated transponder is 

turned to the ON position, the ECU (Engine Control Unit) checks the crypto code of the key and, if 

correct, allows the vehicle to start the engine. If the verification has been failed, the engine cannot be 

started and the immobilizer warning lamp blinks.

Immobilizer unit

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Transponder

3. VERIFICATION OF KEY

1) Verification

The immobilizer system prevents the vehicle theft by allowing only the authorized key to start the 

engine. The transponder inside the key communicates with the immobilizer installed in the key box, 

and the system permits the engine to start after confirming the encrypted coding from the engine ECU.

In the following cases, a driver may be unable to start the vehicle with the immobilizer.

The immobilizer unit transmits 

the encrypted code to the 

transponder.

(2)

The transponder sends an encrypted signal to the unit as a response.

The transmitted code is changed to an encrypted signal in the unit.

The system compares the signal from transponder and the encrypted signal in immobilizer unit.

(3) 

(4) 

(5)

When two or more immobilizer keys come into contact with (each) other(s).

When the key is close to any device sending or receiving electromagnetic fields or waves.

When the key is close to any electronic or electric devices such as lightening equipment, 

security keys or security cards.

When the key is close to a magnetic or metal object or a battery.

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Immobilizer Unit