AIT sensor and ABS/caution light

[mas]

After 5.5 months of winter storage, Smartypants kicked over about 4-5 times and sparked right up!!

Prior to storage (few days) I lost power (I think I mentioned this in a post last Fall) my troubleshooting consisted of inspecting the waste gate arm and the EGR.  While looking at the EGR I noticed a wire hanging down with a sensor dangling.  It was the AIT, cleaned and reinstalled and the power is back.  My question, why did it not throw a code?

 

ABS/caution triangle; also previously mention but hey, this is a new season so I will start all over.  The light(s) have come on before and maybe a month later would just go out and life is back to normal. When it happened again, I took a closer look at the ring sensors, and their respective connectors, all looked clean.  What is my next troubleshoot?

[mas]

Follow up troubleshooting; on start up the dash is clear of lights, at idle in the driveway, pump the brakes a few times, nothing, hand brake up and down a few times, nothing, in gear and hand brake down, abs/caution light turns on, also , foot on brake in gear, release foot brake, abs/caution light turns on. Would this be associated with the brake sensor under the car under the brake pedal?

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[Willys]

Or the actual brake light switch...???? Check all grounding pin points for corrosion.....ABS is a nasty creature...lol.  Mine took plenty of tries to get it blead properly.

[mas]

I replace the brake switch a few days ago, it made no difference, prior to that, I found the top rear lights always on with the car running and sometimes the front left blinker light is always on. I did the obvious first, I checked the fuse and the bulbs, all good, sounds like a grounding issue to me, where to look? 

 

[mas]

I took a tester to the old brake switch, definitely u/s, re-inspected the new one to see if it was defective, I got readings with the tester, so I will say it functions.  At the moment I have no brake lights, ABS and caution light are on.  I checked the rings, clean and unbroken, pick up sensor is in the same condition.  bulbs, fuse all good.  Now working on the grounds.

[LooseLugNuts]

no brake lights is most likely to be the switch...or power supply to the switch

 

used to happen to me a lot when water from my shoes leaked down the brake pedal shaft into the brake switch and turned to ice in the winter

 

 

maybe check switch with a high current test light (like a headlight bub) ...using dvom can give false positives showing continuity with very low current