[SilverE24]

Hi,

Sometimes, after locking the car with pressing Lock on the key fob, the orange lights flash three times (as it should), then keeps flashing very fast, and the interior lights stay on, as if the alarm just set off and no siren sound.

I found that, if I pull the fuse #5 in the fuse box that's located in the back of the trunk, it will disable it from happening. However, the red light on the truck button inside the car stays on, and no flashing three times at all when locking. It just locks the car.

I did a few research, it seems the problem is the battery inside the siren need replacing. Where is it located on a Right-Hand-Drive (UK/Japan specs) car? Do I need to replace the whole siren or I can just replace the battery?

Also, if I leave fuse #5 pulled, will it drain the car battery with the red light stays on all the time? And any other side effects?


Thanks

 

[A1EK]

Hi,

Sometimes, after locking the car with pressing Lock on the key fob, the orange lights flash three times (as it should), then keeps flashing very fast, and the interior lights stay on, as if the alarm just set off and no siren sound.

I found that, if I pull the fuse #5 in the fuse box that's located in the back of the trunk, it will disable it from happening. However, the red light on the truck button inside the car stays on, and no flashing three times at all when locking. It just locks the car.

I did a few research, it seems the problem is the battery inside the siren need replacing. Where is it located on a Right-Hand-Drive (UK/Japan specs) car? Do I need to replace the whole siren or I can just replace the battery?

Also, if I leave fuse #5 pulled, will it drain the car battery with the red light stays on all the time? And any other side effects?


Thanks

I've seen this on my wifes C Class, I unplugged the siren and problem was gone, it just means there is no sound when the alarm goes off. I keep meaning to buy a used siren off ebay.

 

[SilverE24]

I've seen this on my wifes C Class, I unplugged the siren and problem was gone, it just means there is no sound when the alarm goes off. I keep meaning to buy a used siren off ebay.

Thanks. Do you know where is the siren located on a Right Hand Drive/Japan-spec car? Under the Driver side or passenger's side?

So, just unplugging the siren will fix it? Any side effects besides no alarm sound?

 

[A1EK]

I beleive the siren is behind the passenger wheel lining at the rear of the wheel. However bare in mind my car is a right hand drive.
To access the siren you can undo the bottom liner fixings and reach in from below.

 

[SilverE24]

I found it and disconnected the siren; it's been a few days now, seems to have solved the problem.

What I don't understand is, since "disconnecting the siren" is equal to "having dead battery in the siren", why would it solve the problem... Maybe the flashing light is a warning that the battery inside the siren is low, not dead?

Anyway, hope disconnecting the siren will truly solve the problem. Time will tell.

 

[A1EK]

I found it and disconnected the siren; it's been a few days now, seems to have solved the problem.

What I don't understand is, since "disconnecting the siren" is equal to "having dead battery in the siren", why would it solve the problem... Maybe the flashing light is a warning that the battery inside the siren is low, not dead?

Anyway, hope disconnecting the siren will truly solve the problem. Time will tell.

You've answered your own question mate, that is exactly why the flashing happens to highlight there is a problem, clever huh,.!

 

[ML Dude]

So the flashing lights, interior light on tells us that the alarm siren battery is low? The siren still sounds when we push panic? Also, my alarm indicator light(tow alarm) flashes quickly(vs. normal armed blink) but does not stay on as you report. Did simply unplugging the siren work, stop all the symptoms you described after locking the doors? Because I found my car will flash lights for 3-4minutes and then go off but randomly start flashing again so as to drain my battery if left locked, please advise.

 

[W208 Hawkwind]

Unplugging the alarm did not help for me. The lights would still flash randomly and drain the battery.

I replaced the siren unit and all was well for a couple of days, until my neighbour complained the alarm was going off in the night.

Had the car diagnosed on STAR and discovered one of the alarm sensors was faulty. They disabled it on STAR and there has been no problem since.

 

[ML Dude]

Was your siren dead before you replaced it or would it still make sound when tripped or panic button pressed? Did you have the blinking tow alarm light, not normal flash but fast flashing?

 

[W208 Hawkwind]

Sorry can't remember the details.