2008 Tahoe park assist codes short to battery

jigfeett

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#1
Make
Chevrolet
Model
Tahoe LTZ
Year
2008
Miles
200k
Engine
5.3
Just helping a friend. I have not looked at the car yet.
Active codes in park assist
B0958 B0959 B0960 B0961
parking aid rear sensor 1, 2 ,3 ,4 short to battery
They replaced all 4 sensors codes came back
They unplugged the module codes went inactive, then came back after clearing them.
Trouble shooting states.
1. check 8v term 1
2. check ground, low ref to ground less than 5ohm term 2
3. check signal to ground
4. check term 3 to v+ short to ground or open
5. if all good replace module
I think if all the sensors code up then they must be the wrong ones or the module is defective but how often do these modules become defective?
Are they a weak point?
Thanks
 

nickb2

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#2
how often do these modules become defective?
More often than four sensors going out at once. The odds on that are like winning the lottery. Would be good to know why someone would even change ALL four sensors if they have a bit of knowledge.

But at least we know all sensors are new, so after wiring is checked for integrity, only thing left would be the module. I do realize parking aid sensors are located in sweet spot for corrosion, I have had a few jeeps with ADAS on board from the states, they do not like the road salt. But 4 sensors at once go short to B+ or ground, wiring is first to jump to mind, then bad grounds causin high resistance, blew a driver or two in module/shorted out a transistor or two.

I see you have some form of getting flow charts, do you have access to OEM wirings? If not, post back, I will provide that.
 

jigfeett

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#3
Agreed don't know why they put in 4 except they must have bought as a group.
I do need an OEM diagram when you have time of course. My resources are limited just what ever I find on the google box. I had a lot of manuals and subscriptions but I left active wrenching years ago and now just help the kids and friends If I so choose..... It is good to choose...
I appreciate the help with these issues.
Thanks
 

nickb2

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#4
I found this nice, a TSB. See pdf.

I states to not replace ALL sensor and object module. But since they are all new, we will focus on what I said before, wiring. If that is THOROUGHLY checked out, then it is module time, and these need to be programmed if new, used, I don't know if they are vin matched, but I don't think so, but hey, you never know.
 

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jigfeett

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#6
Thank you this information is much better than what I currently have. Does your information have connector view for the module connectors?
Thank you, I appreciate your help with this.
 

jigfeett

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#7
Update, went through all wiring, checked all sensors to for power and short to power + power to ground-and each other found nothing touching no issues.
I even went wire A to B from module to sensor no issues found.
I found that the module is obsolete and a replacement is offered,
When scanning, codes did not remain the same in the same scenario.
Switching sensor location made no difference.
Updates to follow.
 
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#8
Update I found a module at the wrecking yard, plugged it in and had vin mis match + some of same codes.

I have read that the aftermarket sensors are junk and may or may not work so I'll be doing some more checks.
I did the listen check and each sensor is clicking
I had the car in reverse and held a card board at each sensor and got the lights and warning buzzer for each one and that was one at a time.
The system is working just have the warning on the DIC, "service park assist"
I'm going to rescan and clear the codes then run it for a day then rescan to see what comes back.

I do not trust the after market sensors but they appear to be working.

I do not believe my scan tool to be defective but anything is possible.

Next step new module, I don't like throwing parts at it and will probably need dealer to program new unit.