I have a M reg Peugeot405 Automatic saloon The
Hi Alan
Yes you are right the alarm will go off unless the battery is that flat that it doesn't have enough power to sound the alarm.
This is the old catch 22 situation.
Have a pair of grips and a 10mm spanner ready to minimise noise time. If you have the radio code, you can unlock it with the key, pop the bonnet, and disconnect the Negative lead with the green thumbscrew and pull it off the terminal first to reduce the risk of shorting, also tends not to spark as much as the other way, then when you come to disconnect the Red Positive, theres no way you can short your spanner to the vehicle earth. Ahhh, Silence! then remove the Positive lead and charge your battery, remove the cell plugs to let the hydrogen gas escape, and make sure its well ventilated, otherwise, BANG could happen, unless its a sealed battery, then don't worry. Once its charged reconnect in the opposite order, but be ready with your keyfob, or better still have a mate ready as soon as you hear the alarm, lock then unlock.
Then just re-enter the radio code by pressing the respective number buttons.
If you don't have the code, you will need it reading, usually about £10 - £20
HAd forgotten all about this one. General conscencus is that it is due to corrosion of the wires (& or connector) that lead to the 'ECU' (I think it's called) unit that sits under the passenger seat floor. (Not the best place for a computer based unit given consensation, wheel spray etc however....). Initially installed a workaround which just cut the battery supply via a remote control as I didn't have the time to spend getting all the cladding off. When I did get round to it, the wires were indeed corroded and after par5 replacement and a bit of resoldering, no worries since. Kept the retrofit though as it comes in handy from time to time. By the way, since then have seen several other VW vehicles - one a 6 seater van just the other day with teh same fault. All six indicator lights on and a faint 'beep beep' from the alarm system. Could be a generic fault on a number of models. *** Tends to happen less when it's hot and dry and that's one way of spottting it - Fault can then dissapear on it;s own as the corroded wires dry out *** G.Hampshire. 2012
General conscensus of opinion is that the wires running to the CCM (comfort control module I think it stands for) unit which is situated under te passenger floor (unusual place you might think for computer circutry) eventually suffesrs from damp be it either condensation or leak of the wheel spray etc. If this is the case, you'll find in warm sunny weather the car is fine and as it gets colder, it starts to sulk and misbehave.
http://www.headfuzz.co.uk/vw_ccm
Solution is to hack off all the cladding (which is quite a job) and replace or repair the wiring or connections to the actual CCM box itself. Of course, that's quite a job - not thw wiring part, but getting to it. I installed a workaround which cut the battery power by remote control until such a time as I could have a go at the wiring loom but sure enough, there it was corroded. Data is available on the web if you look enough....
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