Ncc73

This has just happened to me in exactly the same way,  drivers side broke off and passenger side not looking too healthy now.  This has got to be a manufacturing issue as the piece that fell off has the integrity of plastic!!!

Thanks for the thread and answer on how to sort it.

Nick

As a new owner with the alarm having gone off once during the day this is a great guide on how to get to the sensor in the dome light.  If it happens again I will be getting my credit card out and disconnecting the motion sensor. 

Thanks for the photos this is a great help

N.

On 06/07/2015 at 11:55 PM, LEDMaestro101 said:

Good evening all, my first post (but not my first visit) to this fine forum.

I have recently bought myself an '03 IS200 Sport and am loving it....however, after a couple of weeks of no faults, Saturday the alarm started sounding about 15 seconds after I lock the car with the key fob and has done it since. I searched around on the forum and found that this could be caused by a number of things, one of which is due to low battery voltage.

This leads me to speculate that my battery is slightly discharged. long story short, I've put footwell lights in and have been doing other minor modifications to the interior and have been leaving my door open for several hours at a time , I really should know better! Also, this morning I noticed my alternator fuse had been blown by the previous and they had bodge it back together with a picture hook! I replaced the fuse today after my internal electrics went dead but everything on the constant 12V feed was working. Everything is back to usual and I assumed that the battery would charge back up to its previous level on my way home from work, about a half hour drive. When I got home I reluctantly locked the car with the fob and about a minute later the alarm went off.

I have also read that there could be a fault with the internal motion sensor in the dome light but, as I said, the alarm only started going off on Saturday and hadn't given me any trouble which leads me to my first theory.

Basically, is there anything else that could be causing my alarm to go off when I lock the car? I checked the voltage and current draw on the (new) battery and it's all normal so could it just need a quick top up of juice?

Sorry for the length of this novel! Any help or insight into this would be greatly appreciated :)

Thanks

J

Same thing has happened to me. 05 model and after an hour long drive the alarm went off after being parked and locked for 10 minutes.  Fob Battery OK,  car Battery charge OK, so I'm going to have a look at the sensor in the light for corrosion. I presume disconnecting it is relatively straight forward?

As a new owner and member of the club these feeds have been very useful.

Thanks

N