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More info that I found on my system, I think it's from the lotus site, but I'm not positive.

Vehicle Security System

Various security alarm systems have been used on the Elise, but whichever system is fitted, it is most important that the vehicle owner keeps secure records of the transmitter codes and mechanical key codes to allow replacements to be ordered in case of transmitter or key loss.
New cars are provided with duplicate keys/transmitters, and the security codes are supplied on tabs, stickers or printed cards, which information should be recorded and kept safely with the vehicle documents. Spare transmitters and keys should be accessible at all times if the grief and misery of lock outs is to be avoided.

Spare or replacement transmitters and keys may be ordered from Lotus dealers quoting the security codes, and are normally obtainable within a few days. If the security codes have been lost, it is possible for the dealer, having adequately established proof of ownership, to request from Lotus a factory record archive search, for which a small charge is made. This would of course be of no value if the alarm system or lock set has been replaced since
factory build.

i) ‘Mk.1’ 1996 to 2000 model year Elise is fitted as standard with a Lucas 5AS security module which is electronically matched to the engine management system and provides the following security features:
- Passive immobilisation; disables engine cranking and ignition circuits.
- Pulse sounding of the car horn if:
- either door is opened;
- the ignition circuit is energised.

The trapezoidal transmitter fob has two buttons, one smooth and one embossed with a padlock symbol. Replacement transmitters are purchased uncoded, and are matched to the car by a Lotus dealer using a scanner tool.

ii) Optional upgrade on ‘Mk.1’ Elise prior to October 1997 was a Cobra Goldline 6019HF, which meets Thatcham Category One requirements and includes the following features:
- Ingress protection using sensing switches on the front bonnet, engine lid and both doors;
- Switchable intrusion sensing using a microwave sensor;
- Self powered siren;
- Passive engine immobilisation;
- Dynamic coding of the transmitter key.
When the alarm is fully armed, triggering will occur if:
- a door, bonnet or engine lid is opened;
- movement within the passenger compartment is detected.
- the vehicle power supply is interrupted.

When triggered, the self powered siren will sound and the hazard warning lamps will flash. The rectangular transmitter fob has a red and a blue button. Replacement transmitters are ordered quoting the security code.

iii) Optional upgrade on ‘Mk.1’ Elise prior from October 1997 was a Cobra 6422, which meets Thatcham Category One requirements and includes similar features to the 6019HF. The round shape transmitter fobs have a large and a small button. Replacement transmitters are purchased uncoded, and are programmed to the car by the owner using the security touch key.

iv) ‘Mk.2’ Elise prior to Feb. '02 and all 340R and ‘Mk.1’ Exige models, use a Meta vehicle security system, being either an M36 T2 electronic immobiliser meeting Thatcham category 2 requirements, or, as an optional upgrade, a full M99 T2 alarm system incorporating M23 cockpit intrusion sensing and a self powered siren, which meets Thatcham 1.

The optional upgrade includes the following security features:
- Ingress protection using sensing switches on the front accesspanels and engine lid.
- Selectable cockpit intrusion sensing using a microwave sensor.
- Automatic (passive) engine immobilisation to prevent the engine from being started.
- Self powered siren to maintain protection if the vehicle battery is disconnected.
- 'Dynamic coding' of the transmitter keys; Each time the transmitters are used, theoperating frequency is randomly changed to guard against the possibility of code copying.

The alarm will be triggered by any of the following actions:
- Opening a door, engine lid or front access panel;
- Movement detected within the cockpit;
- Energising the ignition circuit ('hot wiring');
- Interruption of the vehicle battery power supply.

The transmitter fob with single button is incorporated into the head of the mechanical door key. Replacement transmitter/keys may be ordered either uncoded (if only a mechanical blade is required, into the head of which the original transmitter board may be transferred), or coded (if security code is supplied). New coded transmitters must then be programmed to the car by the owner using a button press sequence.

v) Elise models built from approx. March '02, are fitted with a Cobra 8185 engine electronic immobiliser meeting Thatcham category 2 requirements, but for enhanced theft and vandal protection, the car can be specified with a Thatcham 1 category Cobra 8186 upgraded alarm which includes cockpit intrusion sensing and a self powered siren.
Immobiliser (8185 & 8186): In order to provide a measure of automatic vehicle security, independent of any driver initiative, both 8185 and 8186 systems will ‘passively’ immobilise the engine’s cranking and running circuits after the first occurring of the following approximate time delays:
i) Four minutes after switching off the ignition.
ii) One minute after switching off the ignition and opening either door.
8186 Alarm System: As an optional upgrade, the Elise may be specified factory built with a Cobra 8186 vehicle security system which incorporates the following features:
- Ingress protection using sensing switches on both doors, both front body access panels, and the engine cover.
- Selectable cockpit intrusion sensing using a microwave sensor.
- Automatic (passive) engine immobilisation to prevent the engine from being started.
- Self powered siren to maintain protection if the vehicle battery is disconnected.
- 'Dynamic coding' of the transmitter keys; Each time the transmitters are used, the operating frequency is randomly changed to guard against the possibility of code copying.
- Personal protection by remote activation of siren.

The alarm will be triggered by any of the following actions:
- Opening a door, engine lid or front access panel;
- Movement detected within the cockpit;
- Energising the ignition circuit ('hot wiring');
- Interruption of the vehicle battery power supply.

The transmitter fobs are the same as used on Cobra 6422 (see above). Replacement transmitters are purchased uncoded, and are programmed to the car by the owner using a Personal Identification Number (PIN) supplied with the alarm.
 

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Hey Ground Loop...

Regarding a previous series of posts in a thread on the subject of transmitter range, this is from the above post:

"- 'Dynamic coding' of the transmitter keys; Each time the transmitters are used, the operating frequency is randomly changed to guard against the possibility of code copying."

Thought you might be interested, in case you didn't read it.
 
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