[brewersprts]

Another question about my 2007 Full Size Supercharged.

When I lock my car and leave it, the alarm will randomly go off. Way more than it should. It seems like it is worse in the summertime but that could be just a coincidence.

When I was driving the range rover daily and parking it at work, it was just annoying and slightly embrarrassing. Now I have company vehicles that I drive and the range rover sits at the house and the alarm will randomly go off during the day and it could be hours that it is sitting out there chirping away.

I don’t need the neighbors hating me more than they do for driving loud vehicles (sports cars and motorcycles) and coming and going at all hours.

I don’t like to just throw parts at something because I am guessing, that can get expensive. But I don’t want to take it to the dealer either, that can get much more expensive, much quicker.

What should I do? Anything I should check first?

 

[RRToadHall]

I am a bit fuzzy on the second gen L322 hood sensor. Disconnect it and jumper the contacts... or you just disconnect it. What happens is the panels expand in higher temps and the alarm thinks someone has opened the hood. The hood switch is similar to an old dome light switch in a door jamb. It's a simple pin switch on top of the fender at the right rear of the hood opening next to the cowl gasket. They aren't expensive if you wish to replace it. Many folks just bypass to avoid issues.

 

[brewersprts]

Thanks for the help. I didn’t realize it was so simple. I unplugged the hood switch and I didn’t get any hood open message or anything like that inside so I just left jt like that.

Alarm hasn’t went off yet. Hopefully that fixes it.

 

[brewersprts]

Just an update. I haven’t had any issues with the alarm going off again. Unplugging the hood sensor seems to have cured it. Thanks again

 

[sb53]

Just an update. I haven’t had any issues with the alarm going off again. Unplugging the hood sensor seems to have cured it. Thanks again

Thanks for the update! Any issues yet with unplugging the hood sensor? I just unplugged mine today (2007 HSE) and I get no error messages and the alarm seems to go on just fine without going off. The bracket broke so I decided to upplug the sensor and see what happens.

 

[ddm2k]

You guys here are great. Thanks from me, as well.


Sent from my iPhone using Tapatalk

 

[datafoo]

Just my .02:

When I had my issue and posted my long thread it wasn't actually the bonnet switch. Instead if was one of the door control modules having a wiring short making it seem like a door switch was going out.

Bonnet switch is the easiest test tho, just unplugging it will let you bypass it to quickly determine if that's the cause. if it is you can try tweaking the bracket or I've seen dimes glued under the hood to improve switch contact.

If you determine the bonnet switch is behaving normally then I'd look at door switches. The micro switches do go out and can cause false alarms. On 2010+ vehicles you can see the alarm triggers in IIDTool which makes diagnosing the phantom triggers much less painful. If you do have a "door trigger" just FYI the rear doors slave off the front doors which is where the module is, behind the door panel, just below the window switches. It can either be a module wiring issue (water likes to get in there) or it can still be one of the actual latches which has the micro switches inside them.