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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 05-06-2013, 02:35 PM   #1
Tyson0317
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Please help identify a lost plug under my hood.

I was working on my A/C Pressure Sensor and had to remove the right headlight. When putting things back together I find this plug that does not seem to go anywhere. The wire dives out from between the radiators and seems to be running towards the left side of the car, but I could not track it.






A bit of a google search found this eBay auction showing a simular looking plug with the same part number on the hood latch. The Bently is as useless as ever on the matter. Can someone look on their car and maybe tell me where this is supposed to be connected to?
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Old 05-06-2013, 04:31 PM   #2
FooFighter94
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Make sure both headlights have all the plugs, that's what it looks like to me. Check fogs also.
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Old 05-06-2013, 04:38 PM   #3
Tyson0317
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There is one on the headlight that looks like that, but this is not it. Im 99% sure that this is the hood latch. I just cant find where it's supposed to connect to.
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Old 05-06-2013, 04:41 PM   #4
itscoo2pyopants
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hood latch sensor SMG
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Old 05-06-2013, 04:55 PM   #5
FooFighter94
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Are you sure?

Quote:
Originally Posted by Tyson0317 View Post
There is one on the headlight that looks like that, but this is not it. Im 99% sure that this is the hood latch. I just cant find where it's supposed to connect to.
The hood latch does not have an electrical plug, the level you pull inside is a mechanical chord which connects to the latching mechanism under the hood. I know because when I had my hood re-installed, the shop did not tighten it correctly.

How many plugs do you have plugged into your lights right now?

EDIT: also check your windshield washer/headlight washer pumps which are attached to your windshield washer tank. That plug looks similar to those as well.
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Last edited by FooFighter94; 05-06-2013 at 04:57 PM. Reason: Additional Information
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Old 05-06-2013, 11:28 PM   #6
Tyson0317
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Check out the eBay link that I posted below my original pictures. The latch is mechanical but it does have a sensor which the Bentley says is part of the alarm system. Every other car I've seen has a button under the hood - Haans and Franz had to put a sensor where a hand can't reach... That said, the part numbers match. Sprayers, all lights and fog lights work. 99.9% sure it's the lower latch sensor, but still cant find where it's supposed to connect...
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Old 05-06-2013, 11:32 PM   #7
Tyson0317
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For the record and anyone searching this thread later - I got a possible solution here: http://www.m3forum.net/m3forum/showthread.php?t=443156

Looks like the plug is hidden in a bundle under the cross member that is above the headlight.
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Old 05-06-2013, 11:49 PM   #8
$ilent ///M
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looks like for the headlight autolevel. Check to see if both lights move up and done when first starting car with lights on
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Old 05-07-2013, 12:46 AM   #9
FooFighter94
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Quote:
Originally Posted by Tyson0317 View Post
Check out the eBay link that I posted below my original pictures. The latch is mechanical but it does have a sensor which the Bentley says is part of the alarm system. Every other car I've seen has a button under the hood - Haans and Franz had to put a sensor where a hand can't reach... That said, the part numbers match. Sprayers, all lights and fog lights work. 99.9% sure it's the lower latch sensor, but still cant find where it's supposed to connect...
That would explain why I have no idea where it goes, as I do not have the alarm system on mine. Also, if it were a latch sensor... wouldn't the cluster notify you that the hood is open, even if it isn't?
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Old 05-07-2013, 02:46 PM   #10
Tyson0317
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Thing is, mine also does not have the alarm, technically. I read some place that all M3's have the factory alarm parts in them exempt for the siren. If your car "has the alarm", the system is enabled and you have a siren to make noise. If your car technically didnt have the alarm, the system is just disabled and you are missing the siren.

You did make a good point about the open hood notification - I dont have it... Maybe the open hood is ran from a different button/sensor. I am a new M3 owner, but looking at this thing from an engeneering standpoint, I am finding more and more often that I am left scratching my head... That thing that peeves me is that these cars cost a pretty penny. All of these sensors and systems are not cheap and I am having trouble understanding why I am paying for them...
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