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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Thu, Sep-23-2010, 05:35:38 AM   #1
hickersb
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Default Trunk Open Sensor

Intermittantly, seems like typically morning when it is cooler, if I open the trunk then close it, I get the indicator light on the cluster indicating that the trunk is ajar. I really have to slam it shut to get it to go off.

I assume there is some microswitch whose position needs adjusting, or perhaps the little rubber bumpers on the trunk need adjusting/replaced?

Any hints on how to begin troubleshooting?
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Old Thu, Sep-23-2010, 04:43:23 PM   #2
ianmason
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Default

I get the same thing, mine happens frequently, so if you find an answer, post it.
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Old Thu, Sep-23-2010, 04:53:13 PM   #3
mpower22
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Default

I would think the sensor is in the latch and is actually triggered to it not grounding out on the chassis when it closes. If its not your latch mechanism, likely a loose cable leading to it that it having problems. Move some wires around with it closed. If your seats fold down that is. .
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Old Thu, Sep-23-2010, 05:52:15 PM   #4
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Mine does that too. The light will be on after closing it, then I just get back out and re-open/close the trunk and it goes off. Doesn't happen to often though.
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Old Tue, Sep-25-2012, 03:49:49 AM   #5
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Default Re: Trunk Open Sensor

I've been doing some searching on this (as my car just started doing this) and the general consensus is the wire loom on the passenger side of the trunk. Apparently the wires break from lots of flexing caused by opening and closing the trunk.

Going to check mine in the morning.


Also... I'm an idiot for not noticing the 2010 on the date code. Oh well...bump for a common issue.
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Discussing Trunk Open Sensor in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)