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post #1 of (permalink) Old 03-22-2017, 07:56 AM Thread Starter
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Bad BCM?

Hi everyone,

I'm new to these forums.

A few weeks ago my passenger side blind spot indicator on the mirror started to stay on / flicker all by itself. Pretty sure the rear passenger Side Object Detection sensor went bad. Car started displaying a message (Service - Side detection system). Wasn't a huge deal but now today when I stated my car I received a few more messages. (Service - Front Camera), (Service - Park Assist System).

So now not only does my Side detection system "Blind spot indicators" not work, neither does the "Lane department" or "Collision detection".

From what I have briefly read online, I believe all of these different systems are controlled by the BCM "Body Control Module".

Has anyone else experienced any of these issues and if so what was the fix?

After work I am going to check the BCM fuse in the engine compartment to at least make sure all of this isn't relate to just a simple blown fuse.
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post #2 of (permalink) Old 03-22-2017, 10:32 AM
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I am not sure what it could be, I wouldn't call the BCM without testing out other issues first. Cleaning all the battery connections and ground connections looking over fuses, would be the first start to try and solve this..

Once you have that all done you should look to see if there is any Data lines for the systems and if they are connected over a common Splice for the Data lines. IF so make sure it is connected and all like it should be.

Then while doing all that. Need to think about a few other things. Was there any aftermarket adds on added to the car. It could be anything added no matter how small. IF it is something in an area not even around the effected area it still matters. Then same time need to think if there was ever an Impact point on this car? When you bought it if not new was the price lower then it should of been? Or maybe you were in a small fender bender? Didn't do anything that you could see but over time there could be somethings that change to cause strain of the wiring around it... Once you have all that you need to then think if there is a point that maybe shorting out.

Sadly with the Complex type of car with all the complex hardware spending a few hundred dollars for the GM Shop Manual maybe needed if you want to do it your self. If not then Chevy can do the work for you, They have the books already and have a Tool that we can't get ahold of and that tool can test things that even costly tools we can get that can test some things. Theirs can test way more. With that issue they would look it up in the book follow xyz and after step for step doing what the book says they will repair or replace as needed. Without the Book it will be hard to even know where to test, Some you can do testing even without the Tech II tool but not without the book...

James

It isn't what you Drive that matters, It is how you drive it.

James
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post #3 of (permalink) Old 03-22-2017, 05:20 PM Thread Starter
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When I got home I took my meter and checked all the fuses. Fuse number 62 was blown. (62 - Front Camera/Park Assist/Side Blind Zone Alert)

I replaced the fuse and it instantly blew again. Knowing i was having issues with the side detection sensors under the rear bumper, i disconnected both and replaced the fuse again. It did not blow that time. So i hooked up each side detection sensor by them selves one at a time with leaving the other disconnected. Fuse still didn't blow. So i hooked them both back up at the same time and the fuse still didnt blow. Not sure what was causing the excessive current draw but now everything works except the side detection like previously before i received the messages for the other items. Seems that everything else is working fine. I have an appointment on Saturday at the dealership to diagnose what the side detection issue is. I will follow up after they let me know what the issue is.
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post #4 of (permalink) Old 03-22-2017, 05:41 PM
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Sounds like there is a short to ground somewhere on your system. Good news is they have tools that we don't that can tell if things are working the way they should. Looking forward to the update...

James

It isn't what you Drive that matters, It is how you drive it.

James
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post #5 of (permalink) Old 03-22-2017, 06:25 PM Thread Starter
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You cant always assume that a blown fuse is a short to ground.

Electronic devices such as the side detection sensors use many different electrical components. Each component has a data sheet with a maximum current draw and inrush current peak. When components fail, they can start to draw more power then they are suppose to causing the "10 amp" fused circuit to exceed that current rating. Something as simple at a Blocking diode can cause the electronic device to draw the excessive current.

My day job consist of designing wiring harnesses for large diesel industrial power units (i.e. generator / pump) and our company manufactures the control panels for these engines as well.

If I had the access to the information the dealer had, such as wiring schematics and such I would be able to diagnose the issue myself.
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post #6 of (permalink) Old 03-22-2017, 06:52 PM
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I've seen this before. I have also seen issues that the vehicle will not start because of this.
Without GDS2 and an MDI (this is the factory scan tool) go underneath the rear facia/bumper of your vehicle and out at both corners you should find the side blind zone alert radar modules. Now look very carefully at both of the modules. If either module has corrosion between the black plastic and porcelain sections that radar module will need to be replaced and programmed. The moduals tend to get corroded internally and puff out so The bad one may be very tight in The facia bracket (when new they fit a little loose in the bracket) and this corrosion also causes the modules to short out internally and cause issues from blown fuses to no starts(this is if a data line gets shorted). A lot of The time if one is bad The other one isn't far behind and I wouldn't be surprised if you need both modules.

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post #7 of (permalink) Old 03-23-2017, 07:34 AM Thread Starter
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Quote:
Originally Posted by Bart77 View Post
I've seen this before. I have also seen issues that the vehicle will not start because of this.
Without GDS2 and an MDI (this is the factory scan tool) go underneath the rear facia/bumper of your vehicle and out at both corners you should find the side blind zone alert radar modules. Now look very carefully at both of the modules. If either module has corrosion between the black plastic and porcelain sections that radar module will need to be replaced and programmed. The moduals tend to get corroded internally and puff out so The bad one may be very tight in The facia bracket (when new they fit a little loose in the bracket) and this corrosion also causes the modules to short out internally and cause issues from blown fuses to no starts(this is if a data line gets shorted). A lot of The time if one is bad The other one isn't far behind and I wouldn't be surprised if you need both modules.

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Yeah i have removed both of the modules and they were in there pretty snug. I looked up online and the modules are $200 each and then the dealer wants 95$ to do the reprogramming. Cost of the module at the dealer is $300+ each.
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post #8 of (permalink) Old 04-01-2017, 05:51 AM
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Muggerrudd,


I had the same issue about a month ago on my 2014 2LTZ with your exact description of symptoms. Dealer replaced the BCM under warranty and problem solved. Lucky for me because they said this part is very pricey (~$1,000 or more).
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post #9 of (permalink) Old 04-10-2017, 08:37 PM
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Quote:
Originally Posted by Bart77 View Post
Without GDS2 and an MDI (this is the factory scan tool) go underneath the rear facia/bumper of your vehicle and out at both corners you should find the side blind zone alert radar modules.
Silly question, how does one go underneath the rear bumper of the vehicle? everything looks like its sealed up pretty good.

Waffleman

Last edited by Waffleman; 04-10-2017 at 08:38 PM. Reason: spelling
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post #10 of (permalink) Old 04-11-2017, 07:35 AM
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Im also having this problem. But with more serious problems at times.... my air bag light is on 90% of the time, when my airbag light is on, climate control doesnt light up or work. Side detection, front end collision, front camera, rear parking sensors, nothing works. Never does. 1 day it took me a few hours to get the car started..... once in a while all my dash will malfunction and a service theft deterrent system will show... also the car doesnt recognize the keyfob when im close (cant open door from locked with key in pocket or open trunk)...
From what i read online its most likely a BCM, or something to do with GM's shitty theft detterent system.
Ofcourse im at 65k, 5k over my bumper ro bumper. Not exactly happy with the problems im having and ofcourse after warranty is up. Rediculous.
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post #11 of (permalink) Old 04-11-2017, 03:08 PM
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I would check your grounds around your bcm to be safe also take battery cable off unplug all connectors at bcm plug them back in a few times to see if that helps before you call it bcm

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It isn't what you Drive that matters, It is how you drive it.

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post #12 of (permalink) Old 04-21-2017, 01:03 PM
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2nd side detection module failure in 5K mile

I have a 2014 LTZ and the right mirror stopped warning me of vehicles in the blind spot. No error msg in my center screen. Found the issue after almost hitting a car. The issue was repaired under warranty (35,522 mile) but dealer (Griffin in Milwaukee)had the car 5 days. They replaced the mirror but then found it was the right module.

Returned to the dealer 8 months later (39972 miles) due to "side detection failure" warning on center screen. I found while driving neither mirror warns of vehicle in blind spot. Had to pay $103 for a diagnosis of left module failure. Dealer said part was on back order and it would cost additional 570 to repair. I pushed for them to cover it but refused and gave me the GM number. GM (case# 82863412176) said they would only cover 1/2 the cost even though this is my 6th GM vehicle and 4th Chevy. Have to decide which car company my family should use in the future since GM does not back up the customer with a needed safety device.
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