Immobilizer Control System: 10C-2
• Do not leave ignition key in a place where
temperature is high. High temperature may cause
damage to the transponder built in the ignition key.
• Do not turn ignition switch to ON position by bringing
radio antenna close to coil antenna. Or, the
immobilizer control system may detect some
abnormal condition and prevent the engine from
starting.
General Description
Immobilizer Control System Introduction
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The immobilizer control system is an anti-theft device that immobilizes the vehicle. It stops the engine from working
and prevents the vehicle from being stolen. It mainly consists of the following components.
• Engine Control Module (ECM)
• Immobilizer control module (ICM) with the built-in coil antenna
• Ignition key with the built-in transponder
A code called the transponder code is memorized in the transponder. And, the code is registered with ECM. Basically,
when the ignition switch is turned ON, ECM reads the code by the coil antenna. When that code agrees with the ICM
registered code, ICM compares the secret code with ECM. When their secret codes agree, the engine can be
started.If there is no agreement between transponder codes of ICM and ignition key or between secret codes of ICM
and ECM, ECM stops fuel injection to prevent the engine from starting and turn the injection warning light ON and OFF
using CAN communication line.
On-Board Diagnostic System Description (Self-diagnosis Function)
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ICM and ECM diagnoses if there is any trouble with the immobilizer control system. The diagnostic information is
stored as the diagnostic trouble code (DTC) in ICM. To read the diagnostic information, use SUZUKI scan tool
referring to “Diagnostic Trouble Code (DTC) Check”.
With the ignition switch turned ON (but the engine at stop) regardless of the condition of the engine and emission
control system, ECM indicates whether there is any trouble with the immobilizer control system or not by either lighting
ON or flashing ON and OFF the injection warning light.
Injection warning light lights ON:
No trouble exists in the immobilizer control system. (After starting up the engine, the lamp turns OFF.)
Injection warning light flashes ON and OFF:
There is some trouble in the immobilizer control system or in the keyless start system. Its diagnostic information is
stored in ICM.
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