Hi,

I have a current problem with the Alarm, at first i thought the LED was faulty but apon testing this it is fine. I have tried all the fuses in the drivers door side and its still the same.

 

When i disconnected the module in drivers door and reconnected the LED started to work, but after a few hours stopped. 

 

Disarming alarming and re arming brought it back once, but now its always off 

 

Reading codes i have "Alarm Horn -h12 01134"

 

Looking up, people suggest its the battery in the siren. Could someone advise where it is, I have seen some say its in the wing, and others under the shuttle panel?

The alarm still goes off if a door is open, or there is movement inside the car.

 

Could it be anything else?

 

thanks

Does the driver's door open icon show on the display?

If not, release the elephant trunk cable from door to the body, at the body. Look for broken wires. If non then wiggle the wiring back and forth and see if the icon comes on.

Failing that, you probably need to investigate/replace the locking unit in the door.

 

Coincidently my car came up with 01134 (Alarm Module H12) recently following an unusual main battery failure (zero volts and high impedance). During the time the battery was effectively non-existent, the alarm battery lost a lot of charge. It took nearly a week for it to recharge from the new main battery. I had the 01134 (and the horn going off occasionally) during that time.

The alarm module is a complete unit (inc battery) accessed by removing the front driver's side wheel and wheel arch cover. Many How To posts on here with photos including battery replacement (easier to just change the module as the old one may have been corroded by a leaking battery).

 

3 hours ago, cah1982 said:

The alarm still goes off if a door is open, 

 

This indicates that the electronics believes the car is still locked suggesting that the car door open signal is not there.

 

3 hours ago, cah1982 said:

or there is movement inside the car.

 

You can temporally turn off the movement detector by pressing the switch for that purpose at the bottom of the pillar between the doors on the driver's side. See Handbook.

When i say the alarm goes off, I mean its triggered in way you expect, e.g turn alarm on all doors locks, when a door is open or windows down and wave inside then the alarm goes off. Not getting any false random alarms.

 

The doors dont lock if one is open etc.

 

The cables are fine as i had all these out few weeks ago as the airbag sensor wires broke. but the LED stopped working well before this. 

 

So that I understand your problem am I right in saying:

1) alarm behaves as expected except:-

2) when you open a door the alarm sounds? How are you unlocking the door - key or remote?

3) red led is not lit at any time

 

1 = yes (just no flashing LED on drivers door)

2 = so lock car double press to disable the dead locks, windows already down when armed reach in pull handle

3 = correct stopped working again, disconnecting the module in door, then reconnect. LED works as it should when armded e.g. fast flash then steady flash. but after a few hours no LED again

Does any one know what happens if you leave the siren alarm module unplugged, obviouls no alarm noise, but would the central locking still work?

 

 

I'd be very surprised if it didn't.

Yeah, i think its other module that controls locks in the door. but never tried, just if i have to wait for part cant bothered resealing unit and fitting it back in lol

As Pete said, but expect the alarm to randomly go off as it recharges its own battery.

My recent experience is that it takes up to a week to recharge the internal alarm battery and during that time you will have random operation of the sounder or random operation of the flashers (all indicators together) or both together.

 

Cheers

My thoughts are take unit off, and put arch liner and wheel back on, and not have a alarm for a week or so

 

Then open the unit up, see which battery is in it (as there appears to be 2 sorts) and state of PCB then if its worth repairing to go down this route, and fit back, if its not then order one from Alliexpress etc, and fit this when it arrives

So after taking the unit appart theres no signs of leakage

 

Measured the voltage and this showed 6.98v

 

So is it lekely to be the bat or not?

 

 

If the door LED works as expected after tampering with the door module but only for a few hours and nothing else has been disturbed I would say you've found the problem, the connection physically failing with time.

 

I'm not familiar with the door module you mention however it sounds like a bad connection either where the LED plugs into or where the connector is soldered to the module.

See i'd go for faulty wiring to LED, but its the fact one time it worked again when alarm was armed, but the car hadnt moved, id not opened the door.

 

But i did read somewhere the LED changed how it lights up or doesnt if theres a fault on system. then theres the error code suggesting its that horn unit which the batteries are only meant to last 5 years, cars from 2009, I was suprised they`d not leaked tbh

2 hours ago, cah1982 said:

But i did read somewhere the LED changed how it lights up or doesn't if there's a fault on system

That is correct.

It has three states: flashing, (initially fast then slows down) - everything ok when locked;  solid on - usually a fault in the door locking system;

off entirely - only had this when I had a recent problem with the alarm system. Problem was its internal battery was flat. Could also be be caused by broken wire I suspect.

H12 alarms have a 6 year recommendation for change according to Skoda.