Outside air temp sensor
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Newbie
Joined: Jul 2018
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s500 s560
Outside air temp sensor
I just about have all the ac gremlins chased out of the car, cabin temp sensors, blower motor, resistor, and everything works manually but the ac diagnosis menu N.02 shows -40.0, it’s 100f outside today. I assume the sensor in the bumper is bad however the temp display on the gauge cluster is also blank. I haven’t found any real information after a couple days searching, ideas? I have a new sensor coming but will that possibly fix the display reading?
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From: Ball Ground, GA (N of Atlanta)
2003 S500 2007 GL450
" I assume the sensor in the bumper is bad however the temp display on the gauge cluster is also blank."
Which temp display? If outside temp, the new sensor (or a bad connection repaired) will fix that.
If engine temp, no connection at all to the outside air temp sensor.
Which temp display? If outside temp, the new sensor (or a bad connection repaired) will fix that.
If engine temp, no connection at all to the outside air temp sensor.
Thread Starter
Newbie
Joined: Jul 2018
Posts: 10
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s500 s560
it was the outside air temp display on the gauge cluster. I replaced the sensor to no avail
still nothing on the gauge cluster and on the a/c control NR.02 still reads -40.0 so we looked at the wiring and nothing obvious. Ideas where to look next?
MBWorld Fanatic!
Joined: Dec 2012
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From: Ball Ground, GA (N of Atlanta)
2003 S500 2007 GL450
I would start checking each of the connectors for bent pins and assuring good connection, Physically examine every inch of wire harness that is accessible.
Senior Member
Joined: Apr 2019
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From: Houston
001 s600, 94 sl600
The signal from the temp sensor is either not getting through to the controller or the controller is not reading/acting on the sensor signal. The WIS will lead you through the diagnostic chain and will identify where the signal disappears.
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MBWorld Fanatic!
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Mercedes
as I says , it’s your instrument cluster or more likely your door control modules (the power seat switches on the door) . Yes it sounds unrelated but they are linked
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