Toyota Sienna Forum - siennachat.com banner
Cancel
Create thread New Garage Forums

2011 Sienna alarm keeps going off!

Jump to Latest
12K views 4 replies 2 participants last post by  186464  
1
#1 ·
Hey guys

I inhererited a 2011 Toyota Sienna Limited. A couple days ago I got home from work and went inside my house and about 45 minutes later the alarm went off. I thought maybe something bumped it so I unlocked and locked it again. After about another 45 minutes the alarm went off again. It continually goes off every 45 minutes or so. The only way to get it to stop is to disconnect the negative battery cable.

I've heard there is a TSB for the hood latch. That's great so I depinned the connector and connected the 2 wires together. After about an hour and a half the alarm went off again. Then again after another 45 minutes. I tested the hood latch switch with my multimeter and it seems to work fine. Bypassing the hood latch switch should eliminate that as an issue?

I'm at a loss of what to check. Anyone have any ideas?

Thanks!
 
#4 ·
You're welcome! ;) I've noticed activity on this forum has recently fallen - might be due to XMAS.

Finding adequate "free" electrical diagrams might be a stretch. You can get them from Toyota for a small fee at https://techinfo.toyota.com/

The following web page has links to diagnosis information about the anti-theft system: Sitemap

I can view a bazillion electrical diagrams for the 2011 Sienna Limited including 19 diagram files for the anti-theft system on the "Auto Repair Source" service available through my local public library's website. It's not realistic for me to download and upload all these files. Maybe your public library offers a similar service.

The first components I'd check would be the switches on the door jams. They are of a type that are known to sometimes fail and which Toyota stopped using on their more expensive cars (e.g. Lexus) around 25 years ago. An intermittent problem with one these switches could set off your alarm. Press each switch with a finger to see if they operate smoothly. If the little "piston" in the switch binds or is sloppy, that could indicate a failure. There have been threads on this forum about replacing them. I replaced a very similar switch on an early Lexus in the 1990's and it was fairly easy but did require removal of interior trim to get to it.
 
Toyota Sienna Forum - siennachat.com
posts
298K
members
106K
Since
2009
SiennaChat is the forum community to discuss problems, maintenance, repairs, mods, projects, specs and all things Toyota Sienna.
Full Forum Listing
Explore Our Forums
Problems, Maintenance, and Repair (Gen 2) General Discussion (Gen 3) General Discussion (Gen 4) Problems, Maintenance, and Repair (Gen 3) General Discussion (Gen 2)