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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 06-27-2016, 05:40 PM   #1
_Niclas_
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Join Date: Dec 2011
Location: Norway
Posts: 2
My Ride: 93 325i Vert
Connector to ambient temp switch is missing.

Hi! A kind of embarrasing problem, i cant find the connector to the outside temp sensor i bought the car 3 months ago and repainted it now. But cant remember if the car showed 40 degrees or not when i started and same thing when i took it apart if i actually had it connected. I have the round "hockeypuck" sensor and the pin type outside temp sensor. But the only connector i have left only fits the round type sensor. The car is a euro 2001 M3.

Where does the wires to the outside temp switch go into? In the same harness that comes from the fusebox and to the head lamp? Anyone have a picture where the wires to the sensor starts?

Last edited by _Niclas_; 06-27-2016 at 05:43 PM.
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Old 06-28-2016, 07:51 AM   #2
markusmarkus
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Join Date: Jul 2008
Location: USA
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First, welcome to the addiction.

The sensor is actually a thermistor. A thermistor is a resistor that changes resistance as its temperature changes. It's a simple 2 wire connection. Get under the car to see if you can find the connector or the wires. If you can't find either the connector or the wires you'll have to remove the plastic liner or the left front wheel. It's held in place by screws and plastic rivets.
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Old 06-28-2016, 09:09 AM   #3
_Niclas_
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Join Date: Dec 2011
Location: Norway
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My Ride: 93 325i Vert
Yeah, i have removed the inner plastic fender and have no headlights etc connected yet so i have lots of room to search for the wires.. But cant find it anywhere. Think i need to unwrap some of the wiring harness that comes from the fuse box.. Really have no clue..

I can take some pics when i get to the garage.

Last edited by _Niclas_; 06-28-2016 at 09:10 AM.
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Old 06-28-2016, 10:48 AM   #4
markusmarkus
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Pix would help. The wires should be in the nearest harness. I'll dig out my Bentley manual later and let you know the wires' colors. Btw, polarity doesn't matter as the sensor is merely a thermistor.
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Old 06-28-2016, 11:47 AM   #5
joegr
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My Ride: 2002 325i
Blue /w red, and blue /w brown, If I recall correctly...
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