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Old 04-23-2012, 11:02 AM
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Where is Temperature Sensor?

I've noticed on occasion my outside temperature will be way off. Seems like it takes a while to catch up.
I noticed there was a thread that mentioned cleaning it, but what do you need to do exactly?
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Old 04-23-2012, 11:49 AM
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Cleaning and adding dialectric grease will surely help. It is inside driverside fender behind headlight I believe.


Actually attaches to headlight bracket drivers side.


Ambient Air Temperature Sensor
The ambient air temperature sensor is a 2-wire negative temperature co-efficient thermistor.

A 5-volt reference and signal circuit enables the sensor to operate. As the air temperature surrounding the sensor increases, the sensor resistance decreases.

The sensor operates within a temperature range of -40C to +60C (-40F to +140F). The HVAC control module receives a class 2 message from the instrument panel cluster (IPC). The ambient air temperature sensor is mounted in the forward engine area, behind the left front headlamp. This causes an air flow issue due to the sensor's location and can effect the ambient air update display parameter in the DIC of the vehicle. For model year 2008 the ambient air temperature sensor will have a new location closer to the grill airflow. In the present position, it is exposed to limited airflow from the grill before it reaches the radiator. The sensor signal varies between 0-5 volts. The HVAC control module converts the signal to a working temperature range.

The ambient air temperature sensor algorithm uses 3 pieces of information, outside air temperature data, vehicle speed, and time the engine was turned off.

The ambient air temperature is updated and displayed by the DIC under the following conditions:

Conditions
DIC Display

If the current ambient air temperature value is cooler than or equal to the old temperature value. Vehicle speed is in excess of 33 mph.
Displays outside actual temperature. Display updates every second.

If the current ambient air temperature value is warmer than the old temperature value. Vehicle speed is less than or drops below 18 mph.
Displays last temperature recorded during last ignition cycle. No update.

New ambient temperature exceeds the previous ignition cycle recorded ambient temperature, and vehicle speed exceeds 18 mph but is less than 33 mph.
Displays outside actual temperature. Display will be updated at a slow rate.

Vehicle speed is greater than or equal to 45 mph. (for at least 3 minutes)
Displays outside actual temperature Display updates at a quicker rate.
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Last edited by Coby7; 04-23-2012 at 12:01 PM.
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Old 04-23-2012, 12:02 PM
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Yep, its attached to the driver side headlight mount
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Old 04-23-2012, 12:03 PM
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Hope I gave you the info you were looking for.
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Old 04-23-2012, 09:23 PM
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I actually discovered this (after years of wondering) when replacing my headlights.
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Old 04-30-2012, 03:38 PM
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Quote:
Originally Posted by Coby7 View Post
Hope I gave you the info you were looking for.
Yes that will help. I'll have to check it out next time I'm under the hood. Probably for my next oil change.

Quote:
Originally Posted by johnccc View Post
I actually discovered this (after years of wondering) when replacing my headlights.
Yeah I had wondered for a few years where that thing was. I don't think it is in the owners manual is it?
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Old 05-02-2012, 07:14 PM
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Mine didn't work from day one and the dealer couldn't (wouldn't) fix it. Gave me the nonsense about me not understanding how it updates. Telling them it displayed the wrong temp for hours on end was like talking to a brick wall. Comical getting the beware of ice caution when it was 60 degrees F out.
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Old 05-02-2012, 07:40 PM
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Who the hell was your dealer? You should be screaming "SARAH"
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Old 05-02-2012, 08:37 PM
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Mine didn't work from day one and the dealer couldn't (wouldn't) fix it. Gave me the nonsense about me not understanding how it updates. Telling them it displayed the wrong temp for hours on end was like talking to a brick wall. Comical getting the beware of ice caution when it was 60 degrees F out.

So the dealer actually admitted they do not no a standard thermometer works?

If I was that guy, I would have at least lied and made up something as plausible and quick as I can, but admitting to not knowing how a basic thermometer works is pretty lame.

What does your outside temp read, just " --- " or just obviously false outside temps?
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Old 05-03-2012, 12:16 PM
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Here's an other picture that shows exactly where it is in the headlight bracket, once the headlight housing is removed.

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