Microwave Sensors (CVM Convertibble Top Module)

Interior protection
The interior protection system is based on a movement detector (microwaves) that detects movements in the vehicle interior and sends corresponding signals to the BC1 (general module).

1. Function
1.1 Interior monitoring
A transmitter antenna is integrated MuW (Multiplex Microwave Sensor) control module for the purpose of generating an electromagnetic field in the vehicle. The reflections are received by the receiving antenna in the control module and transferred to the integrated electronic circuitry for evaluation.

There are a total of four sensors fitted at each seat position in the vehicle interior. These include a master controller MuW as the control element and as interface to the Body Controller (BC1) and three slave MuWs.

Movements in the vehicle cause a change in the reflections and trigger an alarm via the BC1.

1.2 Notes on operation
For insurance reasons (depending on national legislation), all windows must be closed at all times also when the convertible top is open.

NB - new: The convertible top must always be closed to guarantee adequate protection of the inside of vehicle!

Large metal objects (e.g. metal case) shield the electromagnetic waves so that in certain areas no alarm can be recognized due to shadow effects.

When the convertible top is open, an alarm may be triggered in the following instances:
- Precipitation (rain, snow, hail etc.)
- Objects that drop into the car (leaves, branches etc.)
- Animals that enter the vehicle (dogs, cats, birds, etc.)
- People who lean on or reach into the car

1.3 Alarm triggering
The alarm triggering is stored in the alarm menu of the body electronics control module.

1.4 Activation/deactivation
The interior monitoring is activated or deactivated by the body controller BC1 by switching on/switching off the 12-Volt power supply for the MuW. The STDWA line activates and deactivates the tilt alarm sensor and the siren.

Interior monitoring begins 30 seconds after activating the anti-theft alarm system. The interior is not monitored when a vehicle door or the luggage compartment lid/engine hood is open. Opening the trunk (trunk) lid or convenience closing of the windows interrupts the interior protection function.

If the MuW assembly detects a triggered alarm, this status is signaled to the BC1 via the INRS line.

In order to avoid false alarms being triggered under unfavorable ambient conditions, the interior protection function can be switched off with the anti-theft alarm system activated as follows:
- Activate anti-theft alarm system via door lock or remote control
- Repeat activating procedure within 10 seconds

1.5 Self-test
After activating the anti-theft alarm system, the interior protection system control module master MuW and the three slave MuWs run a self-test. If a fault occurs here or everything is OK, this is reported across the INRS line to the BC1. The BC1 stores a fault entry for a defective interior motion sensor (e.g.: Microwave sensor driver's door).

The self-test can also be initiated manually.

To do so, run the test module at Body -> Locking and security functions -> Anti-theft alarm system -> Self-test of microwave sensors

A faulty module is not activated in order to avoid false alarms being triggered.

1.6 Defining the designation (slave 1-3) for the microwave sensors
Definition of the slave sensors (defining which sensor is slave 1 or 2 or 3) is by means of external wiring at pin 2.

Passenger's door sensor (slave 1): pin 2 to +12 V (terminal 30)

Rear right sensor (slave 2): pin 2 to ground (terminal 31L)

Rear left sensor (slave 3): pin 2 not wired