The system is passive and self-priming; the driver does not need to actively do anything to protect his/her vehicle. The system is activated automatically 5 seconds after the ignition is switched off; system readiness is indicated by the PATS LED flashing every 2 seconds.
If a valid key is inserted into the ignition and turned to position "II", the system switches on the PATS LED first while the code is being read from the transponder.
If a valid code is received, the PATS LED is switched off. The engine can now be started.
If an invalid key is inserted into the ignition and turned to position "II", the system switches on the PATS LED while the code is being read from the transponder.
If the code received does not agree with any of the codes programmed into the vehicle, or if errors occur in the system, the engine cannot be started. The PATS LED will flash for one minute at a frequency of 4 Hz or will light up for one minute. Then it will flash an error code.
The system error code is a two-digit code which can be read by counting the flash signals. Each of the two numbers is output with a one second pause between them; after the second number has been output, there will be a pause of three seconds, then the error code is repeated.
The vehicle comes from the factory with two programmed keys; a maximum of eight keys can be programmed into the vehicle at any one time.
System functions are programmed as part of PCM programming. However, the instrument cluster is also a coded component which reads and programs the keys and compares them with the PCM .
Before the engine can be started, three codes must be compared with each other: the key's code, the instrument cluster code and the PCM code.
Additional keys can be programmed by the dealer using WDS.
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Interior monitoring sensors
Anti-theft alarm system sensors
Depending on the market and the model variant, there are three anti-theft alarm systems available:
- The system with perimeter monitoring detects if the doors, bonnet and tailgate are being opened and monitors the audio system and the ignition switch.
- The system with perimeter and interior monitoring in addition detects unauthorised access, for example, through a broken window.
- A Thatcham category I anti-theft alarm system (mainly for the British market) is fitted with a horn that has its own battery power supply; it also uses slightly different detection strategies.
The anti-theft alarm system outputs a visual and acoustic warning if unauthorised persons attempt to gain access to the vehicle, remove the radio or turn the ignition switch to positions "II" or "III" without a valid PATS key.
As a visual warning, the system switches on the hazard warning lights, whilst the acoustic warning is done with the anti-theft alarm system horn or the horn with its own battery power supply.
Once the ignition switch is in position "0", the anti-theft alarm system is activated 20 seconds after the vehicle is locked centrally or double-locked.
After a delay of 20 seconds, the bonnet, tailgate and all the doors are alarmed, provided that they are fully closed.
If the bonnet, tailgate or one of the doors is not fully closed, it can be opened without triggering the alarm.
The anti-theft alarm system can be switched off by centrally unlocking the vehicle either with the remote controls or by turning the key in one of the door locks.
NOTE:To switch off the alarm on a Thatcham category I anti-theft alarm system, the ignition switch must be turned to position "II" with a valid PATS key within 12 seconds of the door being unlocked.
If the tailgate is opened manually with a key or via the remote control, the anti-theft alarm system blocks the trigger for the alarm system or the interior monitoring (if fitted) until 20 seconds after it has been closed.
The interior monitoring facility is primed 20 seconds after the vehicle has been double-locked, if the bonnet, tailgate and all the doors remain closed. For optimum system operation, all the windows and the sliding roof must be fully closed.
NOTE:If a window or the sliding roof is not fully closed, there is a risk that a false alarm will be triggered.
The interior monitoring facility is an additional security system which triggers the alarm if unauthorised access to the vehicle is detected.
