Car immobiliser issue

[silverscoob785]

Hi everyone

 

I've recently bought a modified 2003 silver wrx, been having some issues with the fob/alarm system

 

Essentially the car won't start anymore. The fob unlocks the car fine and the red light on the boost gauge stays red, but the red key on the dashboard stays flashing so when you try to start the car it sets the alarm off. I've changed the batteries in both fobs with no luck.

 

I've also disconnected the Battery and reconnected hoping that would reset the system, only change now is the red light flashes rapidly. As far as I can see the fob disarms the car fine, but then as soon as you try and start it, the alarm goes off. I don't think its key related as I've changed the Battery in both keys.

 

One thing to note is the other day I locked it and then the alarm went off for no reason, only happened once but I assume 20+ year old electronics is to blame.

 

I want to try and sort it without having to call a mechanic out but this is my first proper modified car so am a bit baffled at the moment

 

Any suggestions?

[Tidgy]

The alarm system and immobiliser are two different systems and it sounds like you have an immobiliser fault. It's not unheard of for keys to unpair from the system due to age, but if both keys worked and now they dont i would lean toward the immobiliser rather than the keys as id be surprised if two depaired at the same time.

Something to note, after 30 seconds of unlocking the car the immobiliser kicks in if you havnt started it. you need to turn the ignition on, then press the unlock button again to turn it off again. you may know that already but i thought better to mention it just in case you didnt and wasnt actualy anything wrong.

 

[DAVID WILSON]

I have a 2007 Outback. and had and was having all sorts of alarm /not starting faults. I started to do a  wire trace from the bonnet switches and sounder and found a mouse had chewed the wiring loom .If the WRX is anything like my Outback its a dash out to get to the alarm unit as it is fitted in the UK so I was informed ,my car lives inside. This is maybe no help but itis something to look at