Is the alarm factory or after market?
When engine is started (or ignition is turned ON), the alarm system would be notified via power supply from the ignition switch and be disarmed. Your problem should be this voltage signal is not received by the alarm control unit and after 4-5 seconds the alarm self-arms.
While braking, one of the doors switch is activated, possibly due to door out of adjustment and the door switch is barely pushed. Door movement during braking would cause the switch to activate thus triggering the alarm.
Does the door ajar/dome light flickers during braking or uneven road driving conditions?
Saturday, August 28th, 2010 AT 12:24 PM