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      04-13-2016, 09:41 PM   #1
bmwmick
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Hood Open sensor Adjustment?

On our way from America to Calif. yesterday, our hood open sensor lit up
on the dash. We had hit no big bumps and had not had the hood open recently. Is there an adjustment on our 2011 35i 6Spd that can be adjusted to prevent this? Also, the hood appears to lift just slightly at high speeds but we have never had the indicator light up before.
I can see that the sensor is heavily spring loaded and gets pushed down as the hood latches secure the u-bolts extending from the hood. I do not know what type of sensors are used. Any info out there?


Thanks,
Mick
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Last edited by bmwmick; 04-13-2016 at 10:03 PM.
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      04-14-2016, 08:23 PM   #2
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Have you tried just giving it a bit more firm closing? I had closed my hood recently with what I thought was enough force to properly latch it. As I started the car, I noticed the same thing with the hood not latched indication. I had to pop the hood again and give it a bit more firm closing. That took care of it.

HP
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      04-14-2016, 10:59 PM   #3
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Quote:
Originally Posted by Herkypilot View Post
Have you tried just giving it a bit more firm closing? I had closed my hood recently with what I thought was enough force to properly latch it. As I started the car, I noticed the same thing with the hood not latched indication. I had to pop the hood again and give it a bit more firm closing. That took care of it.

HP
Yes, I have tried closing the hood with a little more force but in the past, just dropping it from about 1 foot did the job. Today, we had no indication of the hood being open and we put about 50 miles on it, running errands.
Hope it's gone for good.

Thanks,
Mick
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      04-16-2016, 12:57 PM   #4
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This is interesting cause today on the highway, doing 120km/hour (70mph) I noticed a bit of hood flutter. Scared me a bit I have to say cause with a Jeep Wrangler, which has rubber closing clamps, this is normal. But a BMW?
So I pulled over at a gas station but all seemed closed properly. Wanted to check as well if there was a hood open warning light so, with a running engine in first gear pulled the latch in the cabin but nothing came on...?

Final remark: I would not be able to close it by dropping it; the two pneumatic springs are too strong. So I just close it gently and then give it a final decisive push.
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      04-18-2016, 12:15 AM   #5
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found my switch

I found the hood latches in RealOem: 51237207225
Hood lock with micro switch, right
Only the right side latch has a micro switch but I will have to remove he latch to access the switch. Further updates when I actually touch this hidden switch.
Moving the U-bolts up one full turn seems to have fixed it for now.

Mick
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      03-19-2018, 04:34 PM   #6
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I've looked everywhere I know of for a N/O micro switch to replace the failed one in our right side hood latch (512237207225) to no avail. I ordered the latch asm yesterday from bmwofatlanticcity for $65 with free shipping. The only thing I was missing was the "hood open" alert in the dash and an alarm if the hood was opened while the car was parked with the alarm set.

Mick
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      03-19-2018, 04:57 PM   #7
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Quote:
Originally Posted by bmwmick View Post
I've looked everywhere I know of for a N/O micro switch to replace the failed on in our right side hood latch (512237207225) to no avail. I ordered one yesterday from bmwofatlanticcity for $65 with free shipping. The only thing I was missing was the "hood open" alert in the dash and an alarm if the hood was opened while the car was parked with the alarm set.

Mick
Is that a part number? It brings up zilch on Google.
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      03-19-2018, 09:50 PM   #8
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Yes, it's a part number. Go to realoem.com and plug it in.
51 23 7 207 225
Why would you use google?
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      03-20-2018, 07:08 AM   #9
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Originally Posted by bmwmick View Post
Yes, it's a part number. Go to realoem.com and plug it in.
51 23 7 207 225
Why would you use google?
Different number. You changed a digit.

Google is really helpful with part numbers because it can find used parts.
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      03-20-2018, 10:25 AM   #10
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Quote:
Originally Posted by NoQuarter View Post
Different number. You changed a digit.

Google is really helpful with part numbers because it can find used parts.
I guess, if you can't use a parts catalog like realoem.com, it could be useful. Especially for millennials.
BMW part numbers are 11 digits, I don't know where the extra (2) came from.
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      03-20-2018, 12:32 PM   #11
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At what kinds of speeds were you seeing the hood lifting? Mine has never lifted at all when properly latched at up to 140 mph on track...
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      03-20-2018, 05:52 PM   #12
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Quote:
Originally Posted by bmwmick View Post
I guess, if you can't use a parts catalog like realoem.com, it could be useful. Especially for millennials.
BMW part numbers are 11 digits, I don't know where the extra (2) came from.
Using realoem does nothing to actually locate and purchase a part. Different reasons to use different tools. Millennial or not.
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