Daytime Driving Light Out?

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Teslawannabe said:
Thank you for your "Clarity" lol. "The certified Honda monkey comment" set me in motion. My only point was "shorts do not have to blow fuses". For example I was speaking about many "modern vehicles" sorry, not Clarity specific. Until the harness is out and can be properly inspected the answer the dealership gave was just speculation and even with the harness out, one wire in a bundle of many may not be obvious. I recently had a new model vehicle with daytime running lamps on all the time with no response from the pushbutton start, no dash response, no audio system response at times. Network testing showed High speed Corporate Area Network 2 was down. Thankfully it was acting up when tested. This knocked out all communications on High speed Corporate Area Network #1 causing every thing to be down. The Daytime running lamps had no fuses and were powered directly by the Body Control Module and by default with no communications, stay on. It was a long drawn out process to locate, but turns out a High speed Corporate Area Network splice heat shrink had a one wire strand poking thru and piercing a ground wire only at times. This was in a harness of about 60 wires and was very difficult to locate. The repair was the easy part.
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I’m somewhat familiar with CAN systems. In our case, CAN is an acronym for Controller Area Network. The C is also replaced with Corporate and Campus in some cases. Our 2005 motorhome utilizes 2 multiplex modules and a Power Distribution Module to control automotive functions.

The multiplex modules are often described as having “self-resetting” breakers/fuses. They will reset, sometimes they act up and trip for no reason, when powered down for a brief period of time. Otherwise they will reset after the fault or short has been identified and repaired. There are no tradition fuses used to protect the circuits which the modules control.

It is curious that a single hot to ground short in your vehicle knocked out all communications. It sounds as though the intermittent short did, essentially, blow a fuse, which reset when the short ceased to exist and the over current situation was, temporarily resolved.
 
Ok folks, we have the car back in our possession. In terms of work that was performed, they replaced the complete wiring harness and also the LED light assembly itself.

As an aside, It might be my eyes playing tricks on me but the “new” light does not seem to be nearly as bright as the non-repaired side. I’m not sure why that would be, but I’ll have a better idea once it gets darker here.


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Did they report on any visible damage to the harness?

It is interesting that they would replace a non-mechanical component if it were functioning properly. Perhaps it was damaged during disassembly?
 
Landshark said:
Did they report on any visible damage to the harness?

It is interesting that they would replace a non-mechanical component if it were functioning properly. Perhaps it was damaged during disassembly?
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No damage reported, just that it had failed. I was half expecting them to say that it was gnawed on or something, but that doesn’t appear to have been the case, or at least they didn’t identify it if it was.


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It was very interesting. HS2 is not supposed to affect HS1. Unplugging the IPMB "image processor B on HS2 allowed HS1 to work even grounded. Vehicle came alive with IPMB Unplugged (360 degree camera module). Even though IPMB was not the cause.
Landshark said:
I’m somewhat familiar with CAN systems. In our case, CAN is an acronym for Controller Area Network. The C is also replaced with Corporate and Campus in some cases. Our 2005 motorhome utilizes 2 multiplex modules and a Power Distribution Module to control automotive functions.

The multiplex modules are often described as having “self-resetting” breakers/fuses. They will reset, sometimes they act up and trip for no reason, when powered down for a brief period of time. Otherwise they will reset after the fault or short has been identified and repaired. There are no tradition fuses used to protect the circuits which the modules control.

It is curious that a single hot to ground short in your vehicle knocked out all communications. It sounds as though the intermittent short did, essentially, blow a fuse, which reset when the short ceased to exist and the over current situation was, temporarily resolved.
Click to expand...

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Teslawannabe said:
It was very interesting. HS2 is not supposed to affect HS1. Unplugging the IPMB "image processor B on HS2 allowed HS1 to work even grounded. Vehicle came alive with IPMB Unplugged (360 degree camera module). Even though IPMB was not the cause. It essentially made the approximate 2.6 + volt signal wire stay low....no communication, no wake up call to all modules ( note: HS1 the main , was not supposed to be affected but it was).

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Click to expand...

20201215_085501.webp


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blinkme323 said:
No damage reported, just that it had failed. I was half expecting them to say that it was gnawed on or something, but that doesn’t appear to have been the case, or at least they didn’t identify it if it was.
Click to expand...

The true answer to this story lies between Honda Corporate and that dealership. We will never know what the actual failure was. ‘Twill be a mystery to the end of time...

Glad she’s fixed and you didn’t spend a penny.
 
Teslawannabe said:
Thank you for your "Clarity" lol. "The certified Honda monkey comment" set me in motion. My only point was "shorts do not have to blow fuses". For example I was speaking about many "modern vehicles" sorry, not Clarity specific. Until the harness is out and can be properly inspected the answer the dealership gave was just speculation and even with the harness out, one wire in a bundle of many may not be obvious. I recently had a new model vehicle with daytime running lamps on all the time with no response from the pushbutton start, no dash response, no audio system response at times. Network testing showed High speed Corporate Area Network 2 was down. Thankfully it was acting up when tested. This knocked out all communications on High speed Corporate Area Network #1 causing every thing to be down. The Daytime running lamps had no fuses and were powered directly by the Body Control Module and by default with no communications, stay on. It was a long drawn out process to locate, but turns out a High speed Corporate Area Network splice heat shrink had a one wire strand poking thru and piercing a ground wire only at times. This was in a harness of about 60 wires and was very difficult to locate. The repair was the easy part.
Click to expand...
Just FYI, it’s “Controller Area Network”.
 
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