F355. How to know if the internal battery in the alarm siren need to be changed?
Ok thanks. That is then the situation I have. It stays on. I guess one have to open the siren by force as there is no opening. BR / Klas
Actually there was an hidden opening on the sirén. Easy to open and there the 7,2V battery was. Now is the next issue to find one. Anyone have an idea? BR / Klas
Klas, if the circuit board is still OK you might consider mounting the battery externally for easy access the next time you have to change the battery. I'm not sure of the battery's mAh capacity, but this one might work: Tenergy 11204 7.2V 3000mAh Flat NiMh High Power Battery Packs with Tamiya Connectors for RC Cars It's been tried before and someone might know of a battery that works. Sometimes the circuit board is damaged by leakage from the original battery. Barry
I did that today. Installed the battery close to the fuse box instead of having in the sirén. A lot better - but the sirén does not work anyhow. The circuit card is most likely damaged due to acid leakage from the old battery with its stupid location in the sirén housing. So, where to get a new circuit card?
Needing to replace my alarm siren batteries, I was disappointed to find that my batteries were the sealed variety (green batteries). My local Batteries Plus hooked me up by matching the batteries and soldering them to the alarm siren circuit board for me. Total cost = $42.38. I saved over $360 v. buying a new one. Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login
Reviving an old thread. So my LED is on again. I got 4.5 years out of the these batteries. What kind of lifespan is everyone else getting? Seems too short for a car that stays on a CTEK 99% of its life.
4.5 years is not bad. Their life span also depends on the quality of the particular brand of batteries used and how long they were kept in stock before installation. Otherwise, the life span of Ni-MH (or Ni-Cd) batteries does not depend on whether they were kept charged all the time or not. They actually last longer if cycled, i.e. fully discharged before they are charged again but this is not possible in this application.
I also got 6 years out of a brand new siren. These batteries are for 2 x $20 original Varta 3.6v 150mAh Ni-MH or 2 x $3.99 generic Ni-MH ones on eBay.
On the left, in front of the washer bottle, kind of beneath the headlight pod. Just wondering how to tackle mine.
On the left as in passenger side? Left hand side if sat in the car not standing in front of it? Sent from my iPhone using Tapatalk
Correct. I can't recall if part of the siren is visible from the top of the car with the bonnet open. I remember seeing the wiring harness for it from above, but I can't remember if my headlight pod was raised at the time. I was trying to create a wiring diagram for the alarm system at the time.
96 spider. I bought new batteries and pulled the alarm. I couldnt figure out how to open it. I think mine has to be cut in half. I just put it back, as mine is somehow still working. I just wanted to avoid leaking batteries ruining the board. Anyone else have to cut theirs open?
Seems most have to. I don't know which years just had a case held together by screws. Here's an example of the screw type: https://www.ferrarichat.com/forum/threads/355-alarm-siren-repair.570136/#post-145835802
I found it necessary to replace my siren battery a year ago. The siren is located on a left hand drive car, just ahead of the front left side marker light. As mentioned earlier, simply remove the bottom left access panel under the bumper. For better access, remove the left wheel and the panel ahead of the wheel. The siren is held to its bracket with two hex nuts. They simply need to be loosened, not removed, as they are captive; the siren will slide free of the bracket with enough wire harness length to drop from the vehicle to disconnect the connector. Early Bosch sirens have four plugged screws that need to be removed to separate the housing for circuit board access. Later models will need to be cut open along the seam as was the case with mine. My batteries measured correct voltage, however there was not enough current capacity for the circuit to operate properly, thus my center air vent LED was luminated during drive. I replaced my batteries with a single Eveready 9v NiMH rechargeable battery (7.9v under load) which fit inside the siren housing. Less than $10.00.
