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Old 20th October 2021, 10:01   #1
Rick-sta
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Default activating volumetric alarm sensor

Hi all,

I retrofitted one of the later square BMW volumetric alarm sensor units (the one that is located near the center of the headlining) but I can't get it to actually work. I followed this guide here and is definitely wired up correctly: https://www.the75andztclub.co.uk/for...d.php?t=118740

When I lock the car I can hear the alarm sensor making clicking sounds similar to rear parking sensors, but no matter how long I wait after locking the car (should start working after 20 seconds) the sensor isn't setting off the alarm when I'm moving about inside the car.

I have 2 sensor units and have tried both in case one was faulty. I have the exact same problem when I tested one on my typhoon years ago.

Does the volumetric alarm need activating on a t4? I can't see any option to activate it on toaf.

Cheers
Rick
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Old 20th October 2021, 11:36   #2
egremont
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Default Ultra Sonic Alarm.

Hi Klazy,

There is a sub-section in the SA part of our cars ZCS codes for alarms.

My car is coded for “Alarm No US”. I am guessing, but think the “US” is MG Rovers abbreviation for “UltraSonic”.

If this is the case, I think you will need to calculate the value for “Alarm WITH US [ultrasonic] and make the necessary adjustment (difference between "No US" calculation and that of "WITH US] to your ZCS via your T4.
Regards,
Bruce.
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Old 20th October 2021, 13:04   #3
stevestrat
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Default

I can see what's confusing you. The how to tests the alarm before any T4 involvement and reckons a T4 is only required to bring the alarm under the diagnostic umbrella. Probably worth contacting Russ or one of the other T4 bods to clarify it.
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Old 21st October 2021, 14:15   #4
BigRuss
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Default

Think you'll need to change the coding to activate it, as it enables those inputs/ outputs in the BCU.
From memory it's easy to do as it's in the dealer options page in vehicle configuration

Russ
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Old 22nd October 2021, 17:18   #5
Bolin
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When I installed mine it worked straight off, no T4 needed. Could be an age thing i.e. dependent on when the car was built?
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