Mazda CX-9 2007 Service Highlights page 427

SECURITY AND LOCKS [ADVANCED KEYLESS SYSTEM]
IMMOBILIZER SYSTEM OUTLINE [ADVANCED KEYLESS SYSTEM]
• The immobilizer system is a vehicle theft prevention device that only allows keys that have previously been
registered to the vehicle to start the engine and prevents it from being started in any other manner (such as
with an unregistered key or by starter relay short).
• The immobilizer system consists of the key (built-in transponder), coil antenna, keyless control module, PCM,
and security light (in the instrument cluster).
• Ignition keys for use with the immobilizer system have an electronic communication device (transponder) built
into the key head that retains specific electronic codes (key ID number).
• The immobilizer system operates automatically when the ignition switch is turned to the LOCK or ACC position.
When this occurs, the security light flashes repeatedly 0.1 s every 2 s.
• In order to start the engine, the immobilizer system must be made inoperable using a key previously registered
with the vehicle. No special operation is required to release the immobilizer system but rather the vehicle is
started similar to vehicles without the system: the ignition switch is turned from the LOCK or ACC position to
the ON or START position and the release operation begins automatically. The engine can only be started after
the key, keyless control module and PCM successfully perform their parts of the verification procedure. For
details, refer to "09-14A-11 IMMOBILIZER SYSTEM OPERATION [ADVANCED KEYLESS SYSTEM]".
• If the immobilizer system is not released due to a malfunction or verification failure, the security light in the
instrument cluster displays a DTC. At the same time, DTCs are stored respectively in the PCM and keyless
control module. The stored DTCs can be verified using the Mazda Modular Diagnostic System (M-MDS).
Repair the malfunctioning part using the verified DTCs. For details, refer to "09-14A-13 ON-BOARD
DIAGNOSTIC SYSTEM (IMMOBILIZER SYSTEM) PID/DATA MONITOR FUNCTION [ADVANCED KEYLESS
SYSTEM]".
• The immobilizer system cannot be deactivated.
Caution
• The immobilizer system must be reset using the Mazda Modular Diagnostic System (M-MDS) after
performing any of the following: "Replacement of all the keys (steering lock replacement or similar
procedure)", "Keyless control module replacement", "PCM replacement" and "Keyless control
module and PCM replacement". Moreover, when performing "Replacement of all the keys" or
"Keyless control module replacement", two or more keys usable with the immobilizer system
must be readied. For details, refer to Workshop Manual.
• Two or more key ID numbers must be registered for the engine to start. For key ID number
registration, refer the Workshop ManualSection 09-14, "IMMOBILIZER SYSTEM COMPONENT
REPLACEMENT/KEY ADDITION AND CLEARING".
• A maximum of eight key ID numbers can be registered for one vehicle. The PID/data monitor
function can be used to verify the number of key ID numbers registered for a single vehicle. For
details refer to Workshop Manual.
• The following conditions may cause poor signal communication between the key and vehicle,
resulting in the engine not starting or a key registration error. Do not perform key registration
under the following conditions:
— If any of the following items are touching or near the key head.
• Spare keys
• Keys for other vehicles equipped with an immobilizer system
• Any metallic object
• Any electronic device, or any credit or other cards with magnetic strips
EXAMPLES:
METAL RING LYING METAL PART OF ANOTHER
ON KEY HEAD KEY TOUCHING KEY HEAD
End Of Sie
KEY IS CLOSE TO OR TOUCHING
ANOTHER IMMOBILIZER SYSTEM KEY
id0914b1101700
METAL OBJECT TOUCHING
KEY HEAD
acxuun00000705
09-14A–9
09-14A