Re: 156 alarm
David, I am having the same problem.
I have carried out a manual test of the alarm as described in the manual, and it says the volumetric sensors are faulty. I think the test is as follows.
turn your ignition on
open the bonnet
turn your ignition off, and within 10 seconds operate the bonnet catch microswitch 5 times, upon doing this the alarm should beep a few times, and flash the indicators to let you know it is in test mode.
When this has happened the alarm will test the volumetrics.
If they are OK you should get 5 alarm beeps and 5 flashes. If they are faulty you get 1 flash.
If you then test all of the doors you should get a beep when you open, and a beep when you close.
When you have finished this just leave the alarm alone, and it will return tonormal operation in 10-20 seconds, it will indicate this by a series of beeps.
I have established that there is no power to my volumetrics, I have sat in the vehicle and tested the D6 plug behind the glove box with a voltmeter, and turned the alarm on, no power.
I am going to remove the alarm box next and take it to bits to see if there is anything obvious within the box that is causing the problem.