Alarm going off

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Christian Fiene

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Hello all,
My alarm has been going off randomly and it's becoming a real nuisance. I am not getting the "Open Hood" or "Open Bonnet" warning on the dash. I haven't checked under the hood yet, but do you have any suggestions why this may be happening?

Thanks for your help.



There is an easy way to test if its the switch and if its not the actual switch its an easy fix.

Testing the switch

1. Open the hood and find the latch on the passenger side there are two. Looking under the hood its the one on the left.

2. Feel behind the latch and there is a plug with 2 wires going into it. Remove the plug, there is a small piece of plastic on the top you push down and pull the plug out.

3. Remove the sensor. On the front of the latch look down there are two pieces of plastic coming out on either side. Take a small screwdriver and push in the tabs while pulling down on the sensor from the back.

4. Once the sensor is removed plug the harness back in.

5. With the key push the lock button. The horn should alarm one time signaling that the hood is open and the truck will not lock. This lets you know that the switch is working in the open position.

6. Push down on the switch in the bottom of the metal C so as not to bend the metal C bracket. You will hear the switch click. With the switch pressed click the lock button on the keyless remote again. If the truck locks your switch is not broken. Let pressure off of the switch and the alarm should go off. Press the unlock button on the remote and the alarm will go off.

7. Now that you know the switch is not bad you can carefully bend the little C bracket metal out so that it is taller away from the switch. Over time the C bracket has lost its elasticity and has been compressed. Plug the switch back in and make sure the wire harness is connected and lock the truck.

8. Problem fixed, I did this to my truck months ago and am still enjoying the silence of a locked and secure truck.

Best,
Christian
11 Range Rover Sport
 

777AIA

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I have replaced this several times... nagging issue. Hood switch doesn’t like high temps, so having the LR3 in Phoenix isn’t always fun. But, I buy part iff ebay for $12.99... twice so far.. new in box.


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777AIA

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For those looking, hood switch is right in the back of the hood latch. Easy peezy to replace...


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Houm_WA

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...a good argument for grammar and punctuation!
 

hell pie

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To illustrate what Christian Fiene was saying, the latching mechanism in question can be seen with the hood open, just above the grill on the passenger side of the vehicle. Use a screwdriver to push the plastic tabs in the squares marked by the red arrows.
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The sensor can now slide down and be pulled into the engine bay.
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hell pie

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My thumb is pointing to the release tab for the sensor plug.
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Press the tab and slide the plug off.
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At this point you can bypass the sensor, by shorting the plug with a piece of wire.
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hell pie

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The "metal c" in the sensor. When the hood is closed, the latch presses on the metal c, which in turn presses on a switch.
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Closeup of the switch underneath the metal c.
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The metal c is not an electrical part in the sensor. It only provides a mechanical means for the latch to press on the switch, which closes the circuit.
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If you observe the wear marks on the metal c, it appears that the latch is not striking on the center, but drifting towards the left. This is likely why the metal c is no longer properly pressing on the switch. As Christian Fiene said, bend the metal c so that it is taller. I think it also needs to bend to the left, so that the latch strikes directly on the head of the metal c.
 
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