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Outside air temperature reads -40 after transmission service

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Suspect outside tempreture sensor is disconnected.

Posted on Nov 15, 2009

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Posted on Jan 02, 2017

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My Buick Rendezvous has the DIC. It works fine but the temperature is always 0 celcius (says 0C). Got 2 new outside air sensors from junkyard and no change. Should i check something else like voltage?


It should be possible to test the sensors with an ohmmeter (I think) as they will likely be temperature sensitive resistors or thermistors.

Testing the voltage was the thing to do in the old days of analogue and direct current systems but I think you will find the electronics on your car is digitally based and difficult or impossible to test with an ordinary meter. An oscilloscope will probably be needed...

Apr 27, 2017 | Buick Cars & Trucks

1 Answer

My outside air temp is reading at -40 on my 2008 Pontiac Torrent. What is the right sensor and where is it located?


Ambient Air Temperature Sensor (UH9)
At the front of the vehicle, at the lower left side of the front bumper bar
Ambient Air Temperature Sensor (UH9)
Pin
Wire
Circuit
Function
A
0.35 L-GN/BK
735
Ambient Air Temperature Sensor Signal
B
0.35 YE
61
Low Reference

Jul 22, 2015 | 2008 Pontiac Torrent

1 Answer

How do I find the fuse on an impala 2002 for the.outside temperature and compass


There are two fuses one in the right I/P junction block an one in the left I/P junction block ! The right is marked DK / RKE 10amp fuse. The left is marked A/C / CRUSE 10amp fuse ! I don't think these are the problem ! These fuses supply power to the microprocessor in the driver information center . According to my service information the microprocessor supply's power to the ambient air temperature sensor an to the compass.
This mode displays an 8 point compass heading on the left hand side of the DIC. The compass will display the current vehicle direction relative to one of 8 compass headings using N, NE, E, SE, S, SW, W, and NW for the readout. The ambient temperature displays on the right hand side of the DIC. If the ambient temperature is below 3?°C (37?°F), the temperature reading will toggle between displaying the outside temperature and the word ICE for two minutes. If the temperature is less than minus 40?°F for more than 2 seconds, OC will display. If the temperature is above 140?°F for more than 2 seconds, SC will be displayed. If OC or SC is displayed DTC's will be set. For compass calibration and compass magnetic variation adjustment refer to Electronic Compass Calibration .

Feb 28, 2015 | 2002 Chevrolet Impala

2 Answers

Outdoor thermometer reads -40 so the climate control system blows heat in the summer


sound like faulty out side air temperature sensor located center radiator support.

May 20, 2013 | 2001 Chrysler Town & Country

1 Answer

Ambient air sensor on 2005 Chrysler Town and Country showing -40


I would suspect the outise air temp sensor is defective, replace it. It is located in front of the AC condensor core.

Jul 19, 2012 | Cars & Trucks

2 Answers

Outside temperature reading -40 and outside temperature sensor has been replaced


had the same problem, it needs time to calibrate, you have to drive it over 19 miles per hour for at least 10 minutes or so and it should reset itself. I would just take it on a drive if you haven't done so yet.

May 30, 2012 | 2007 Chevrolet Impala LS Sedan New Cars

1 Answer

Temperature display isn't accurate


Hi Dale. Look under the front bumper either on the left or right trim panel. The trim panels are triangle in shape. An outside temp sensor usually sits in this area. The sensor may be missing. BMW has the sensor, wire, and connector available sperately if they are missing or damaged. It will cause the outside reading to be -40 and can cause the a/c compressor not to operate.

Feb 29, 2012 | 2000 BMW 3 Series

1 Answer

Air conditioner suddenly stopped working and my outside temp on dash reads at ( - 40 )ever since.heater works fine


the sensor that reads the outside temperature may be the problem.The computer will not turn on the a/c if it is 40 below outside.

Apr 14, 2010 | 2008 BMW 528i Sedan

2 Answers

Misreading outside temperature sensor on 2001 Audi A4


There are four sensors for ambient tempurature and they work in unison to provide information to the temp reading on the dash, the heater control head ( where to direct air, blending of warm/cold/outside/inside air flapper controls) depending on the ambient temp and the inside air temp sensor located just above the radio as well as the sun sensor on the top of the dash as well as the a/c compressor head.

When you start your car, the body control module takes the readings from all sensors, outside air temp located in front of the radiator, air temp sensor located in the airbox ( senses temp of air being drawn in from the outside into the air box), coolant temp, inside air temp sensor and the sun sensor on top of the dash (this is why it takes a few seconds for the climate control system to begine when you start the car). The intake air sensor is 1st priority, inside air second, coolant third, ambient 4th and sun 5th. For instance, if the sun sensor reads the sun is hot but the interior sensor reads cold, the inside akes priority. The goal is for the system to achieve a tempurature inside the car that matches the selected temp. It uses all of the sensors to set the system up to achieve that goal as quickly as possible.

Example; Its mid afternoon, sunny and 40 degrees outside adn your in stop and go traffic. The intake sensor reads 40 degrees, the outside sensor reads 60 degrees (heat from radiator...engine heat protrudes into cabin) and the sun sensor reads high (sun is strong). The system is set for 72. priority one sensor reads 40, inside sensor reads 65, ambient reads 60= system will blow hot air to the floor out put, dash outlets will lightly flow 65 degree air so the sun doesnt roast you yet your feet are cold(if it blew hot air from all outlets, your upper body would be hot but your legs/feet would be cold). as the interior sensor reaches desired temp, air will be distrubuted through thee dash, defrost and floor with the warmest air coming out the floor and defrost, coolest air out the dash vents. Its a complex system!

The two sensors that will screw the system up the most are the intake and interior sensors. the system will function reasonably well with just those two sensors though it wont blend air temps between outlets if the sun sensor isnt working. If the outside sensor fails, it simply uses the intake sensor, if the intake sensor fails it will rely on the front sensor. However, since the intake takes priority over the outside sensor, if the intake sensor sends incorrect resistance info rather than failing, it will take priority and cause the unit to malfunction such as in your case.

The intake air sensor can be changed from the outside with patience. If it where me, I would pay the two hrs labor and let the dealer do it right.

Kevin,
Kevins Small Engine service,
South Berwick ME. 03908

May 01, 2009 | 2001 Audi A4

1 Answer

Outside temperature thermometer on 2005 Ford Freestar van


my thermometer is blinking -40 degrees how can i fix this

Jan 19, 2009 | 2006 Ford Freestar

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