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My outside air temp has been reading extremly low for some time. I cleaned the crusty terminal with no success. I replaced the sensor (no change) and decided to replace the pig tail. I cut off about 3 inches of wire from the old pigtail. I stripped the wire to connect the new pigtail and it's still looks black (oxidized). I''m leaning on removing the front facia and opening up the harness untill I find good wire and replacing the bad stuff. Any adivice, opinions, suggestions?
If the wire is discolored, that is corrosion and that will also change the resistance of the circuit. The circuit reports temp based on resistance of the sensor - so if you change the circuit resistance due to corrosion in the wiring, the reported temperature will be inaccurate. You need to cut back to clean copper wire. You cannot scrape it clean or use black or green strands.
Seal it with dual wall shrink tube when you make the splice.
Last edited by Ed Ramberger; Feb 17, 2019 at 08:18 PM.
If the wire is discolored, that is corrosion and that will also change the resistance of the circuit. You need to cut back to clean copper wire. You cannot scrape it clean or use black or green strands.
Seal it with dual wall shrink tube when you make the splice.
Yeah, I think the front nose is coming off tomorrow. The wire harness is unaccessable in the front end, with the exception of about 6 inches. It'll be interesting to see how far back it goes.
Well, the front bumper cover is off. I have the wires cut back to the main harness. The wires look better, but still oxidized. I really don't want to open the main harness
First thing I’d check is if you are getting 5 volts on the light green/black reference wire. That 5 volts comes from the HVAC module. Is your sensor OEM or aftermarket ??...with an ohmeter I’d check that new sensor to be sure it’s good...at 32 degrees 32,654 ohms, 50 degrees 19,903 ohms, 68 degrees 12,493 ohms...now that copper oxide on your wiring...is that just on the surface ??...can it be removed with a couple swipes of a Scotch Brite pad ??...I’d also check the ground side of the sensor...it grounds to the HVAC module at pin D1...the module itself is grounded at G202 which is at the bottom of the right A pillar !!
First thing I’d check is if you are getting 5 volts on the light green/black reference wire. That 5 volts comes from the HVAC module. Is your sensor OEM or aftermarket ??...with an ohmeter I’d check that new sensor to be sure it’s good...at 32 degrees 32,654 ohms, 50 degrees 19,903 ohms, 68 degrees 12,493 ohms...now that copper oxide on your wiring...is that just on the surface ??...can it be removed with a couple swipes of a Scotch Brite pad ??...I’d also check the ground side of the sensor...it grounds to the HVAC module at pin D1...the module itself is grounded at G202 which is at the bottom of the right A pillar !!
I wish I would have seen this sooner. I took the wiring back as far as I could then soldered in a new length of what I cut off. Plugged it in and knock on wood, she is reading correctly. I think I'm good.
I wish I would have seen this sooner. I took the wiring back as far as I could then soldered in a new length of what I cut off. Plugged it in and knock on wood, she is reading correctly. I think I'm good.
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Advice on outside air temp wiring
