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  #1  
Old 03-03-2021, 12:05 PM
snoop9erdog snoop9erdog is offline
 
Join Date: Oct 2005
Posts: 276
Default Garmin Can BUS Testing

Is there a recommended procedure for testing the CAN BUS circuits prior to sealing up with shrink wrap to catch any issues? Prior to finishing the backshell connections. Can someone recommended what they did to ensure good connections? Thx
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  #2  
Old 03-03-2021, 12:19 PM
upperdeck upperdeck is offline
 
Join Date: Dec 2009
Location: Menomonee Falls, WI
Posts: 155
Default

I know that if you boot up the g3x into config mode, it will show green check marks next to all the devices if they are online. It will also show the can bus stability as a percentage.

I can also tell you from experience that all green check marks is no guarantee. I had a blob of sharp solder poke it's way through heat shrink and make contact with the back shell grounding out the can bus after about 20 hours on the airplane. It promptly crashed the can bus but in an intermittent fashion. Took hours and hours of trouble shooting to chase this issue.
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  #3  
Old 03-03-2021, 12:52 PM
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g3xpert g3xpert is offline
 
Join Date: Sep 2010
Location: Olathe, KS
Posts: 2,993
Default CAN bus Troubleshooting

Quote:
Originally Posted by snoop9erdog View Post
Is there a recommended procedure for testing the CAN BUS circuits prior to sealing up with shrink wrap to catch any issues? Prior to finishing the backshell connections. Can someone recommended what they did to ensure good connections? Thx
Hi Ed,

There is a CAN bus troubleshooting section of the G3X Touch Installation Manual
that will be helpful, 2.3.1.3.6 CAN Bus Troubleshooting, starting on page 2-26.

Please let us know if you have any questions. You can always email us at G3Xpert@Garmin.com if you would like.

Thanks,

Justin
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  #4  
Old 03-03-2021, 01:20 PM
PilotjohnS PilotjohnS is offline
 
Join Date: Jan 2016
Location: Southwest
Posts: 1,391
Default easiest check

The easiest check is to check for shorts as you build.
As you build up each connector:
1) ohm check from canbus high to canbus low and make sure it is open.
2) ohm check from canbus high to connector back shell (ground) and make sure it is open
3) ohm check from canbus low to connector back shell and make sure it is open.
4) check from the newest connector that you just got done building up to the previous one for continuity from canbus high to canbus high, and from canbus low to canbus low.

5) when you are all done, check from the last connector to the first connector continuity from canbus low to canbus low; and canbus high to can bus high, and open from canbus high to ground and canbus low to ground.

Do these checks before pulling the connectors into the boxes and before power up everything.
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WARNING! Information presented in this post is my opinion. All users of info have sole responsibility for determining accuracy or suitability for their use.

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  #5  
Old 03-04-2021, 06:37 AM
snoop9erdog snoop9erdog is offline
 
Join Date: Oct 2005
Posts: 276
Default Thanks

Thanks for the comments. I checked the continuity and shorts last night from the right wing mounted GMU 11 to the Roll servo and all was good. That's a good check practice sequence John, thank you.
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