Electronic module above blanking plate in headliner

TDIvolvo · Aug 13th, 2019, 14:09

What does it do - it is listed as an alarm sensor module - mine is soaking, water is running down the wire and into it - I disconnected it and got no messages or warning lights so I can live with that. Is it the motion sensor/cabin ultrasonic sensor?

I have not removed the milky coloured plastic cover to have a look at the electronics so I am not sure if it would have survived a dunking or not. As it seems not to make any difference to the locking then I will probably just leave it but just keen to know what it does.

My siren batteries are gone and the siren doesn't work so I don't really have an alarm anyway.

MarvinMitt · Aug 13th, 2019, 16:31

It's the cabin mass movement sensor.
You can test it, lower the windows and put your hand or something inside the car.
If it causes false alarms then you can disable it from the CCM module, where the waves are inside the car.
Also replacing the sensor from breakers should be cheap.

oragex · Aug 13th, 2019, 22:51

While there, any chance the sunroof drains are blocked ?

Aug 13th, 2019, 14:09	#1
TDIvolvo Master Member Last Online: Nov 9th, 2023 15:17 Join Date: Sep 2008 Location: Lanarkshire	Electronic module above blanking plate in headliner What does it do - it is listed as an alarm sensor module - mine is soaking, water is running down the wire and into it - I disconnected it and got no messages or warning lights so I can live with that. Is it the motion sensor/cabin ultrasonic sensor? I have not removed the milky coloured plastic cover to have a look at the electronics so I am not sure if it would have survived a dunking or not. As it seems not to make any difference to the locking then I will probably just leave it but just keen to know what it does. My siren batteries are gone and the siren doesn't work so I don't really have an alarm anyway.

Aug 13th, 2019, 16:31	#2
MarvinMitt Senior Member Last Online: Nov 1st, 2021 21:18 Join Date: Sep 2016 Location: Tartu	It's the cabin mass movement sensor. You can test it, lower the windows and put your hand or something inside the car. If it causes false alarms then you can disable it from the CCM module, where the waves are inside the car. Also replacing the sensor from breakers should be cheap. __________________ 2002 V70 D5 Last edited by MarvinMitt; Aug 13th, 2019 at 16:34.

Aug 13th, 2019, 22:51	#3
oragex Premier Member Last Online: Jul 26th, 2021 21:24 Join Date: Jun 2013 Location: Coldnada	While there, any chance the sunroof drains are blocked ? __________________ Several Volvo Repair Videos https://www.youtube.com/playlist?lis...ECTts0FSVSOT_c

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