The alarm on my s40 is going off intermittently. One time the key fob auto lock wouldnt work at all. The lights continued to flash after the siren stopped and i had to drive it around the block to get it to stop/re-set. It has happened three times tonight. The other two times I could use the key fob. What is causing this?
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2000 Volvo S40 Question: Faulty Alarm
Answer #1Bret Bodas from RepairPal Test Shop, June 23, 2009, 14:18Master
You are going to need to check to see if there any trouble codes stored in the alarm module. I have seen the sirens fail on other Volvo's but not this model. This could also be a problem with the central locking system, but it's very hard to know without performing a proper diagnosis of the vehicle. (even then it can be very difficult to diagnose electrical issues)