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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > BMW Coding > Alarm retrofit - always thinks hood is open, alarm never arms



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      06-26-2018, 10:25 AM   #1
desertman123
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Alarm retrofit - always thinks hood is open, alarm never arms

So I retrofit the alarm on my car. Added +K302 to my VO, then enabled everything. I even went as far to reset ALL of my car's coding to default settings (incl. DWAS/DWAI) and the problem persists.

If the hood switch is plugged in, the alarm never arms (single beep) and the car keeps telling me the hood is open, even though the switch is properly mounted and the hood is definitely closed. It only disarms (2 beeps). If I unplug it, everything works as it should.

I bought everything used (the siren, switch and ultrasonic module). Maybe just the switch is defective?
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      06-26-2018, 12:18 PM   #2
RocketSurgeon
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That's a distinct possibility.
If you have INPA, you can view live data from the alarm. Just pull up the alarm data page and push the hood sensor button the see if the status changes in INPA.
They do have a tendency to go bad, on the older cars the alarm would go off for no reason as the sensor began to fail.
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      06-27-2018, 08:59 AM   #3
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I'd definitely be looking at the switch.
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      07-19-2018, 02:48 PM   #4
desertman123
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Quote:
Originally Posted by RocketSurgeon View Post
That's a distinct possibility.
If you have INPA, you can view live data from the alarm. Just pull up the alarm data page and push the hood sensor button the see if the status changes in INPA.
They do have a tendency to go bad, on the older cars the alarm would go off for no reason as the sensor began to fail.
Quote:
Originally Posted by lnxguy View Post
I'd definitely be looking at the switch.
Gentlemen looks like you were correct, the switch was defective. Simply bought another used one off eBay and it immediately worked.
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      07-20-2018, 08:46 AM   #5
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They switches go bad often. So much so, that I did not purchase one when I did my low budget alarm retrofit.
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