Going through heads quickly

Jonathonmp

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Hello all,

Hope this message finds everyone doing well. Got an issue on my hardware version 2 CPU setup. I originally was running two heads up front. Then I started getting error on boot and one of them not being recognized anymore. I ended up with 3 heads now up front instead of the original 2. Working well for about 3-4 months now maybe less. However today the dreaded fault returned. This is occurring on a different head then originally. Originally front 2 was to blame today front 3 is to blame. all three sensors are brand newish. 3-4 months old or so. All the wiring that came with the new sensors was used. Just made sense to add a head and change all the wiring out when I had the engine out doing my rebuild and killing time for the machine shop to finish. Does anyone else have any experience with this same type of thing happening? Could my CPU really be burning through new heads like its going out of style? Just curious if anyone else experienced this. Tom has been great. Sent him my logs and said I would get back to him once I finish up my diagnosis. Right now its appearing the head is bad.

I am an RF engineer and building race engines engines is my hobby so don't be afraid to get very technical should you feel the need to. Voltage to the CPU is within spec as well at all times or at least for a 1 hour drive with my multi meter hooked up.
 

Dragons

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This surprises me! I'm on one of the original runs of v1 cpu, my heads are still on P2 series, it's lasted amazingly well..

May I ask what region you live in? Also any chance of voltage spike? Any problems with hard wired dashcams?
 

thebravo

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Are you using the ALP sensor brackets to hold the sensors or are they mounted with tape/sugru?
 

Jonathonmp

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I did look at voltage spike as a potential issue however the multimeter showed safe levels. I am using the brackets it came with cut down to length and screwed in. Both radar detectors are hardwired obviously and not a problem at all.

I did notice something rather odd when I was taking the middle sensor and moving to the outside dead location so I can still have coverage that even after 3 resets and 3 times loading new configuration files and firmware was on the usb stick as well so idk if it actually reinstalled the firmware each time or juat the first but what I noticed is that even though master volume is 5 it sporadically goes up to the correct volume level and then way soft as you go through the menu. No gps, no Hifi and no Bluetooth. Don’t use any of those at all. Bare bones I know
 
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thebravo

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I did look at voltage spike as a potential issue however the multimeter showed safe levels. I am using the brackets it came with cut down to length and screwed in. Both radar detectors are hardwired obviously and not a problem at all.
Is the bracket in contact with the front lens at all? If the bracket is squeezing on the lens it can cause water intrusion, the brackets should be only touching the housing and there should be a small space between the bracket and the lens... Also do you use a pressure washer or high water pressure carwash?
 

Jonathonmp

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Don’t use a pressure washer on the front at all. Just the sides of the car and that’s when I feel like digging it out and dealing with that. The lens is about 1/8 in front of the bracket lip. Sticks out away from the car 1/8 so the bracket is from the 1/8 inch back to the wire exit point.
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I think what I may try next is using the old cables that are in still excellent shape and hookup this sensor while sitting in the car where the control box is and set the sensor on the roof or something. See if I can get any sort of output or indication of diodes firing with the camera in the dark.
 
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