Testing the Movement Sensor and Indicator LED

Information and verification, alarm

Symptom and function description
Central electronic module (CEM) is the main module for the alarm functions. When a locking command is received by the Central electronic module (CEM), the Central electronic module (CEM) will first lock the central locking system and then activate the alarm. A long flashing signal, from the vehicle's direction indicators, confirms that the alarm is activated and that the doors are locked. The alarm LED will start to flash directly after the system has been activated. How the vehicle confirms that the alarm is activated can be adapted to the customer's wishes by programming the Infotainment control module (ICM).
The alarm should trip when:
- Door, bonnet or boot lid are opened.
- A non-approved key is used in the keyhole or if the key has been tampered with.
- Movement detected in the passenger compartment (only applies if the vehicle is equipped with a movement sensor).
- The vehicle is lifted or towed away (only applies if the vehicle is equipped with a level movement sensor).
- Someone attempts to disconnect the siren or battery.
- The panic function is activated via the remote key.
The siren is used as the sound source for the alarm function. The siren includes an internal battery which is charged when the lights are on. The climate affects the life of the battery. Consequently the siren should be replaced at regular intervals.
Remote key includes an internal battery. When the battery in the remote key runs down a message is shown on the driver information module (DIM). Another indication that the remote key's battery is running down is a reduction in the remote key's range.

Hint: For more information, see Design and Function.

Verification
Check the different alarm system functions as follows:

Note! The alarm must not trip during testing. If the alarm goes off it should be possible to deactivate using the remote key's unlock button or by putting the remote key in the starter switch. A signal confirming alarm deactivation must be given by the direction indicators (two short flashes).

Testing the movement sensor
- Sit in the vehicle.
- Deactivate the movement sensor, then activate the alarm.
- Wait 30 seconds. Without moving.
- Test the movement senor in the passenger compartment by moving.

Testing the function of the indicator LED
- Check the LED status before and after alarm activation and with the ignition switched on.
Interpret LED indication flashing as follows:
- Unlit LED, indicates that the alarm is deactivated
- The LED flashes rapidly, after the alarm has been deactivated, up until the ignition is switched on. Indicates that the alarm has been tripped.
- The LED flashes once per second after the vehicle's direction indicators have produced one long flashing signal. Flashing indicates that the alarm is activated.

Is the function OK?

Yes - No Fault Found

No - FAULT FOUND

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