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Intermittent errors with Blind Spot Monitor

RangerBill

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Here is the source for VREF and SIGRTN for the above diagram of the air inlet damper feedback.
Screenshot 2026-07-23 171150.webp
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RedlandRanger

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That is too funny - I don't even remember that! I'm not going to worry about that one. It came back after I cleared all the DTCs after I got all the wiring patched back together.

I think my fix turned out pretty good - if you didn't know, you'd think nothing ever happened:
20260723_140031.webp


I reset that one DTC but it came right back. The A/C and heat work fine - it doesn't seem to be causing any issues and since it has been hanging around for a while I'm just going to ignore it.

I'm just really happy I was able to find and fix this issue myself. If it hadn't been for you guys with your suggestions and help I never would have continued pushing thru it. It just dawned on me while working on it today that since I know there was a mouse in the back seat somewhere, it would probably make sense to look in that vicinity for damaged wires.

Thank you again to @RangerBill and @airline tech - you guys rock!
 

RangerBill

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That is too funny - I don't even remember that! I'm not going to worry about that one. It came back after I cleared all the DTCs after I got all the wiring patched back together.

I think my fix turned out pretty good - if you didn't know, you'd think nothing ever happened:
20260723_140031.webp


I reset that one DTC but it came right back. The A/C and heat work fine - it doesn't seem to be causing any issues and since it has been hanging around for a while I'm just going to ignore it.

I'm just really happy I was able to find and fix this issue myself. If it hadn't been for you guys with your suggestions and help I never would have continued pushing thru it. It just dawned on me while working on it today that since I know there was a mouse in the back seat somewhere, it would probably make sense to look in that vicinity for damaged wires.

Thank you again to @RangerBill and @airline tech - you guys rock!
Looks good and glad that it works. The air inlet damper controls outside air entering the HVAC unit or recirculating air.
 

Cabose-1

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Good to see you got the fix! Not good to see the mice screw up so many vehicles. I can say with all of this testing, depending on your comfort level and skill of mechanics, a power probe makes a hell of a tool for a test light! Add power add ground, ohms all kind of stuff. It was a game changer for me as a mechanic. I did that work some 10 plus years ago.
@airline tech , i see all the grounds on the wiring diagram, i remeber on lots of vehicles the bcm or other modules would add ground to eletronics, is that still the same, changing, or only certain vehicles? Its been a while since i have been in a garage
 
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RedlandRanger

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Good to see you got the fix! Not good to see the mice screw up so many vehicles. I can say with all of this testing, depending on your comfort level and skill of mechanics, a power probe makes a hell of a tool for a test light! Add power add ground, ohms all kind of stuff. It was a game changer for me as a mechanic. I did that work some 10 plus years ago.
@airline tech , i see all the grounds on the wiring diagram, i remeber on lots of vehicles the bcm or other modules would add ground to eletronics, is that still the same, changing, or only certain vehicles? Its been a while since i have been in a garage
Electrical stuff has always been a challenge for me. I can do basics, but I know enough to be really dangerous - especially on modern vehicles. Older stuff I can do a lot more on.

I've heard about power probes - I should look into one.
 

airline tech

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Electrical stuff has always been a challenge for me. I can do basics, but I know enough to be really dangerous - especially on modern vehicles. Older stuff I can do a lot more on.

I've heard about power probes - I should look into one.
I have this - and can plus 1 - they are nice - it looks like the price has jumped a lot since I bought mine
P Probe Test Kit.webp
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