Motion Detector Sensitivity

The default setting (power interrupted then reconnected) for the motion detector sensitivity for the laterdesign alarm ECU is 12 units. Saab recommends that this level be raised to 20 units (made less sensitive) in order to minimize the risk of false alarms. The driving environment of certain vehicles may require adjustments to more sensitive or less sensitive motion detector settings, but 20 units should be considered the basic level.

Change the motion detector sensitivity as follows:

1. The alarm system should be in "Transport" mode (LED flashing once every four seconds). If the system is not in "Transport" mode, remove and reinstall the alarm system fuse.

Figure 2.:

2. Turn the driver's door lock to the unlock position and hold it there for at least 10 seconds (Figure 2). When the siren chirps and the parking lights flash, release the key.

3. The LED will flash one flash per second for approximately 10 seconds then it will start flashing twice each second. This signifies that the alarm is now in the "Sensitivity Test" mode.

Figure 3.:

4. In order to adjust the alarm ECU to the recommended basic setting, you must turn the key in the driver's door lock to the right (lock) position and hold it for two seconds (Figure 3). Repeat this cycle eight times to adjust the alarm from the default setting (12 units) to the Saab-recommended basic setting (20 units).

Figure 4.:

5. After the basic level of 20 units has been reached, turn the key in the driver's door lock quickly from neutral to unlock two times (Figure 4). This will set the new sensitivity setting into the ECU memory.

Figure 5.:

6. To return the alarm to the "Disarmed" mode, turn the key from neutral to the unlocked position three times within two seconds (Figure 5). The LED will stop flashing.
7. Open and then close the driver's door and lock it. After the interior light delay cycles off the alarm will go through its arming cycle and the LED should flash once every second.