Theft alarm sensor (690)
| Theft alarm sensor (690) |
| Location |
Theft alarm sensor (690)
| Principal use |
Used by the anti-theft alarm to detect access to the car. The anti-theft alarm sensor also includes a tilt sensor which reveals attempts to lift the car to remove the wheels, for example.
| Type |
This sensor consists of a plastic housing with a built-in microprocessor and tilt sensor, and is also fitted externally with 2 ultrasound senders/receivers and a 4-pin connector. 2 holes in the roof console cover permit ultrasound to pass through freely.
The tilt sensor reads angle changes both longitudinally and transversely. Any change in excess of 3° over less than 3 minutes triggers the alarm. The sensor is calibrated to trigger the alarm before the car is lifted to such an extent that a wheel could be removed.
| Connection |
This sensor is constantly powered up and communicates with the body control module (BCM) via a 2-way communication cable. A command for activating or deactivating the sensor is sent from the BCM. If the power supply is temporarily disconnected, the anti-theft alarm sensor remains in the same activation status as before. The alarm status and diagnosis status are transmitted from the anti-theft alarm sensor so that the BCM knows that the sensor is operational.
| Pin no. | Signal type | Description |
| 1 | +30 | Power supply |
| 2 | Ground | Power supply |
| 3 | - | Not used |
| 4 | Communication cable | Serial communication BCM-UAS |
Wiring diagram, power supply
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