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Hi
the horn on my 08 grand cherokee goes off on its own i have had to disconnect it till i solve the problem also the battery keeps running flat it has a .4ah drain could this be connected ?? thanks
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Question edited for clarity.
Question moved to model category.
The security alarm and engine immobilizer are functions of the Body Control Module (BCM) and the ECM. You can't just pull fuses. When the battery goes completely flat, or is disconnected, you just need to reset the Security System which is done via the Remote Fob.
Most of the time it will be found in front of or behind the front grille, or front bumper......the best idea is to trace where the sound is coming from, locate the horn and disconnect.......
Sounds like a bad alternator, engine will only run till battery goes weak, due to alternator not charging system, any auto parts will check your charging system at no charge, hope this was very helpful.
under the ecu on the right hand side inner wing ,near the fuse box is the siren,un plug and remove the ecu then un plug the siren remove it by any means I had to pry mine off it has its own battery pack inside,I binned mine cos it doesn't affect the running of the Jeep hope you got sorted
Alarm Module Reset Procedure NOTE: This information applies to a Vehicle Theft Security System (VTSS) that was armed when the battery was disconnected and reconnected.
When the armed VTSS senses that the battery has been disconnected and reconnected, it enters its power-up mode. In the power-up mode the alarm system remains armed following a battery failure or disconnect. If the VTSS was armed prior to a battery disconnect or failure, the system will have to be actively or passively disarmed following a battery reconnection.
The power-up mode will also apply if the battery goes dead while the system is armed and battery jump-starting is attempted. The engine no-run feature will prevent the engine from starting until the alarm system has been actively or passively disarmed.
Passive disarming of the Vehicle Theft Security System (VTSS) occurs when the vehicle is unlocked using the key to unlock either front door or the lift gate. Active disarming of the VTSS occurs when the vehicle is unlocked by depressing the Unlock button of the Remote Keyless Entry (RKE) transmitter.
Once the alarm has been activated (horn sounding, lights flashing, and the engine no-run feature), either disarming method will deactivate the alarm.
Depressing the Panic button (if equipped) on the RKE transmitter will also disarm the VTSS, but the horn will sound and the lights will flash for about three minutes as part of the Panic feature. The horn and lights can be stopped by pressing any of the RKE transmitter's buttons or driving the vehicle above 15 mph.
Replace that fuse and start by removing fuses one by one from block, till draw disappears. Then, check that system for problems. Don't forget: your alternator will always show up as a small draw. Check accessories such as glovebox light first... Often, if box is not closing properly, it will kill the battery in a few days. Same goes for interior light delay!
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