Multiple door senors bad LR3 - Defender Source
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  #1  
Old October 16th, 2016, 11:55 AM
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Multiple door senors bad LR3

Have been getting front door open messages when driving and door is obviously closed. Happened intermittently. Finally had to get door sensor replaced last week as the alarm kept tripping when locked. Thinking all is well, low and behold today I'm sitting inside and the GD alarm goes off. Pissed I go outside crank it up and it now says rear left door open when closed. Mechanic that fixed front said he's never seen more than one fail. What's interesting, the alarm always trips in afternoon when sun has warmed up the truck. Anyone else dealt with this in LR3?

I find it hard to believe door sensors fail in such close period of time. If there was a way to disable alarm I'd do it and forget it. Very annoying.
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  #2  
Old October 16th, 2016, 12:55 PM
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The problem is the LR3 hood alarm switch. Replaced it with a new one Switch: Land Rover Underhood Alarm Switch
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  #3  
Old October 16th, 2016, 01:09 PM
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Quote:
Originally Posted by rover26c View Post
The problem is the LR3 hood alarm switch. Replaced it with a new one Switch: Land Rover Underhood Alarm Switch
I'm not getting a hood message, rear door message now.
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  #4  
Old October 16th, 2016, 02:17 PM
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Are you saying the hood switch could be bad, making the alarm go off but sending signal that the door is culprit?
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  #5  
Old October 16th, 2016, 03:30 PM
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Mine did this right before the battery died.

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  #6  
Old October 16th, 2016, 03:32 PM
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Originally Posted by crown14 View Post
Mine did this right before the battery died. Sent from my SAMSUNG-SM-N920A using Tapatalk
I put in New battery last winter. Unless battery is bad. Told wife she has two choices. Never lock it again or sell it. Quite frankly I don't have the time to deal with this type of bullshit. Running to the shop to swap out every door lock so we might be able to lock it is insane.
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  #7  
Old October 16th, 2016, 03:44 PM
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I had one in recently with an alarm issue. The body computer logs the sensor that tripped the alarm- door, hood or other sensor. In this instance , the right hand sill was full of water, and the trigger was the right front door. Went through the splices in the harness in the sill, re-soldered and use a heat shrink that contains a sealant. No repeat of the issue, but additionally they haven't left the sunroof raised in a rainstorm.....
Don't know if this address's your issue, but thought I'd share!
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  #8  
Old October 16th, 2016, 03:48 PM
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Quote:
Originally Posted by Roverlab View Post
I had one in recently with an alarm issue. The body computer logs the sensor that tripped the alarm- door, hood or other sensor. In this instance , the right hand sill was full of water, and the trigger was the right front door. Went through the splices in the harness in the sill, re-soldered and use a heat shrink that contains a sealant. No repeat of the issue, but additionally they haven't left the sunroof raised in a rainstorm..... Don't know if this address's your issue, but thought I'd share!
No water ingress Trevor. I'd feel better if there was so I'd know that was a possibility. Such a shame as this is a solid truck with about everything major addressed and 77k miles, cleanest I've ever seen. These type of situations really shit on the owning experience.
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  #9  
Old October 16th, 2016, 04:02 PM
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Quote:
Originally Posted by WeBeCinYa View Post
Are you saying the hood switch could be bad, making the alarm go off but sending signal that the doors is culprit?
Yes, that was my wife experienced. We went to the dealership and they replaced the hood switch. (Since then no more alarm go off, that was 2 years ago)
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  #10  
Old October 16th, 2016, 04:07 PM
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Quote:
Originally Posted by rover26c View Post
Yes, that was my wife experienced. We went to the dealership and they replaced the hood switch. (Since then no more alarm go off, that was 2 years ago)
Was she getting door opened messages or just hood? Like I said mine have always said door, both left side now. If your situation was same I'm willing to try hood switch.
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  #11  
Old October 16th, 2016, 04:14 PM
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Quote:
Originally Posted by WeBeCinYa View Post
Was she getting door opened messages or just hood? Like I said mine have always said door, both left side now. If your situation was same I'm willing to try hood switch.
Yes, rear doors/hood, but the main culprit is the hood alarm switch.
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  #12  
Old October 16th, 2016, 04:17 PM
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Quote:
Originally Posted by rover26c View Post
Yes, rear doors/hood, but the main culprit is the hood alarm switch.
Good info. I figured these trucks were sophisticated enough to accurately tell you if it was definitively one door or other that was issue. I assumed since it originally said driver door open, that that switch was bad, and mechanic agreed saying that was the recording in software. I'll loop the connection on the hood switch and see if alarm goes off.
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  #13  
Old October 16th, 2016, 04:26 PM
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Quote:
Originally Posted by WeBeCinYa View Post
No water ingress Trevor. I'd feel better if there was so I'd know that was a possibility. Such a shame as this is a solid truck with about everything major addressed and 77k miles, cleanest I've ever seen. These type of situations really shit on the owning experience.
You've pulled the carpet finisher and checked in the harness run channel?

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  #14  
Old October 16th, 2016, 04:30 PM
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You've pulled the carpet finisher and checked in the harness run channel? Sent from my SAMSUNG-SM-N920A using Tapatalk
Yep, pulled up all that plastic and inspected harness area, dry. Plus no rain here in months.
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  #15  
Old October 16th, 2016, 04:30 PM
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Your comment about the sun warming the truck is interesting, my alarm went off once under similar circumstances only it was the upper tailgate not completely latched.

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  #16  
Old October 16th, 2016, 04:40 PM
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Did you read the fault or just the instrument display?
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  #17  
Old October 16th, 2016, 04:42 PM
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The hood switch itself is cheap, and easy to replace yourself, so you might as well do it. I don't like replacing parts blindly to see if they fix things, but in this case I consider it preventative maintenance since you'll be replacing it at some point anyway
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  #18  
Old October 16th, 2016, 04:49 PM
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Quote:
Originally Posted by lordhelemt View Post
Did you read the fault or just the instrument display?
Initially I read message on display that said driver door open.

Mechanic claimed he read alarm logs saying driver door. So driver door lock replaced.

Today alarm went off and when I started truck it said rear door was open when it was not.

I'm really hoping this is a glitch from hood switch. I've looped the connection and will watch and see.
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  #19  
Old October 16th, 2016, 09:04 PM
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Could it be the alarm module it's self (Anti Theft Module)?
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  #20  
Old October 16th, 2016, 09:06 PM
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Originally Posted by CDN38 View Post
Could it be the alarm module it's self (Anti Theft Module)?
I don't think anyone including the vehicle knows. At this point I'm keeping the hood latch connection complete with a jumper to see if it makes a difference.
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