3-Series (E46, E90)Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.
Open your hood, and remove the microfilter that is located at the firewall, at the back of the engine. There are 3 twist tabs and the cover comes off, and then pull the filter out. Look down into the ac case area to the left, behind the firewall, and if you see an alarm siren mounted there, then you have an alarm. If not, you can get one installed. The dealer alarm is setup for the car, and is the best way to go without having to rig crap up. It's about $400 installed.
The "clown nose" on my recently bought 2001 325i blinks whenever the car is locked. It also responds by staying on for 1 second when I hit lock after arming the car (to disable the motion sensor and tilt alarm).
Does that mean my car has the alarm? Or do I have to look behind the microfilter to confirm?
the clown nose is just a blinking LED light. it doesnt mean you 'have' an alarm.
here are the various situations: read carefully
1)if you lock your car with the remote key and it makes a 'chirp' sound: you have the alarm & it is activated.
2)if you lock your car with the remote key and it DOES NOT make a 'chirp' sound: EITHER you have the alarm but its not activated OR you DO NOT have the alarm.
3)if you lock your car with the remote key and it DOES NOT 'chirp' and if you HAVE the "MOTION SENSOR" or "TILT SENSOR" or "SIREN" (stated above): this means you HAVE the alarm, but it is not activated. Take it to the dealer for activation.
4)if you lock your car with the remote key and it DOES NOT 'chirp" and none of the items stated above are present (sirens, sensors, etc). This means you DO NOT have the alarm.
In some cases, if you lock/unlock your car and the turn signals blink and also the clown nose LED blinks: this means you DO NOT have the alarm. Even though it blinks and the turn signals blink when you unlock/lock the car, you do not have the alarm. This is actually an option. If you do not want an alarm, you can ask the dealer to activate the clown nose LED and the turn signal blinks when you lock/unlock the car. This option usually introduces fault codes (which you not need to worry about). Basically, the computer is tricking the car that it has an alarm and in doing so, it activates the clown nose and blinkers
Another simple way to see if you have the alarm is to lock the car. Hold down the TRUNK button on the key for 2-3 seconds. If the panic sirens goes off: you have the alarm and it is activated. If no sirens goes off: you do not have the alarm OR you do have the alarm but its not activated yet.
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