Has anyone done a CarPlay retrofit / Headunit replacement for 991.1
#2041
Intermediate
I thought that may mean that too. But I don't think my car has any cluster update. Just got it from major service 2 weeks ago so it would be on the latest if they had one.
I will check the CAN settings again later and then will order the quadlock extension to try cutting the calble
I will check the CAN settings again later and then will order the quadlock extension to try cutting the calble
#2042
Burning Brakes
I got a reply from Erisin. They suggested the following:
I think the "a" means to remove the unit to check if the problem stops as this also makes "b" make sense. "Refresh the car system" is probably bad translation.
I wouldn't cut any cable on the factory harness as I want to be able to put it back to stock for warranty reasons. I will try the above, if they don't work, I will order a quad-lock extension cable and cut the CAN-L from that one and see
I think the "a" means to remove the unit to check if the problem stops as this also makes "b" make sense. "Refresh the car system" is probably bad translation.
I wouldn't cut any cable on the factory harness as I want to be able to put it back to stock for warranty reasons. I will try the above, if they don't work, I will order a quad-lock extension cable and cut the CAN-L from that one and see
#2043
Burning Brakes
I thought that may mean that too. But I don't think my car has any cluster update. Just got it from major service 2 weeks ago so it would be on the latest if they had one.
I will check the CAN settings again later and then will order the quadlock extension to try cutting the calble
I will check the CAN settings again later and then will order the quadlock extension to try cutting the calble
#2044
Intermediate
This is what they sent. I'm not going to cut the car's harness. I need to be able to put it back to stock for warranty reasons.
But if the settings don't fix it, I will get a quadlock extension cable and use that to cut the CAN-L.
But if the settings don't fix it, I will get a quadlock extension cable and use that to cut the CAN-L.
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ZedZed (02-19-2024)
#2045
Burning Brakes
Thanks for that. My wife's Cayman is out of warranty so that isn't a concern for me. I could cut the cable, stick a bullet connector on each end, but leave the two parts disconnected. Then, to go back to factory all I'd have to do would be to plug the two bullet connectors together and bingo - reconnection of CAN-L. However, your idea of using a quadlock extension is much more elegant, so I think that would be the better route. I shall investigate. Thanks again.
#2046
Intermediate
I tried the settings instructions they sent. It didn't work. I ordered a quadlock extension. Should have it next week hopefully. Will send updates once I install it
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ZedZed (02-19-2024)
#2047
Rennlist Member
I just ordered a quadlock extender - even if it doesn't work, having the extra cable length will be useful when removing the unit to fiddle around...
Mine's coming from Europe somewhere via eBay so will be 1-2 weeks
Mine's coming from Europe somewhere via eBay so will be 1-2 weeks
#2048
Burning Brakes
#2049
Rennlist Member
Here you go:
Quadlock harness cable wiring extension for retrofits BMW, AUDI, VW, PORSCHE 1:1 | eBay
This looks like it contains all the right connectors for my non-Bose unit e.g. has blanks where the 4 round holes are and a blank block below that
Quadlock harness cable wiring extension for retrofits BMW, AUDI, VW, PORSCHE 1:1 | eBay
This looks like it contains all the right connectors for my non-Bose unit e.g. has blanks where the 4 round holes are and a blank block below that
Last edited by andy2111; 02-19-2024 at 11:26 AM.
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ZedZed (02-19-2024)
#2050
Intermediate
Here you go:
Quadlock harness cable wiring extension for retrofits BMW, AUDI, VW, PORSCHE 1:1 | eBay
This looks like it contains all the right connectors for my non-Bose unit e.g. has blanks where the 4 round holes are and a blank block below that
Quadlock harness cable wiring extension for retrofits BMW, AUDI, VW, PORSCHE 1:1 | eBay
This looks like it contains all the right connectors for my non-Bose unit e.g. has blanks where the 4 round holes are and a blank block below that
I guess they will be wondering what happened and suddenly they sold out all their cables
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andy2111 (02-19-2024)
#2051
Rennlist Member
If anyone ever wondered what these things look like inside.... I decided to open up my old HU in the limited hope that the RAM chip was removable rather than being embedded on the PCB
If it was removable I could have upgraded my Erisin unit from 4GB to 8GB - but it's not possible.
In any case, here are a few pics for the curious amongst us!
If it was removable I could have upgraded my Erisin unit from 4GB to 8GB - but it's not possible.
In any case, here are a few pics for the curious amongst us!
Last edited by andy2111; 02-19-2024 at 01:46 PM.
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ZedZed (02-19-2024)
#2052
Rennlist Member
The answer from Erisin is very interesting and fits well with the results of the tests I did a couple of weeks ago and our assumptions that the issue was at the CAN bus level.
From what they are saying, looks like an issue with the implementation of the low-level CAN bus "electrical" protocol. Their solution seems to just disconnect part of the CAN bus because the HU is most likely sending the wrong signals/current values and they interfere with the car's CAN bus functions.
@andy2111 thanks for the pictures. Can you please let me know if the quadlock plug that is hold into the HU aluminum case by two screws has any electronic components on it or just wires that connect to the main board? I cannot see it very well from your pictures. If there is anything more than just wires, can you post a picture? Also interested on a close picture of the main board area where the quadlock plug connects and its circuitry.
From what they are saying, looks like an issue with the implementation of the low-level CAN bus "electrical" protocol. Their solution seems to just disconnect part of the CAN bus because the HU is most likely sending the wrong signals/current values and they interfere with the car's CAN bus functions.
@andy2111 thanks for the pictures. Can you please let me know if the quadlock plug that is hold into the HU aluminum case by two screws has any electronic components on it or just wires that connect to the main board? I cannot see it very well from your pictures. If there is anything more than just wires, can you post a picture? Also interested on a close picture of the main board area where the quadlock plug connects and its circuitry.
Last edited by Chuck245; 02-19-2024 at 02:31 PM.
#2054
Intermediate
@Chuck245 both the quadlock connector and the black connector for the antennas just pull out. They both connect to pins/sockets on the circuit board underneath.
I had to prise both up with a small screwdriver to get them free - and then you just push them back on to refit
I had to prise both up with a small screwdriver to get them free - and then you just push them back on to refit
#2055
Rennlist Member
@andy2111 If there is no electronic circuitry on the quadlock itself, this means that the CAN bus low-level communication protocol is implemented directly at the main board level. Most likely by the electronic components mounted near the quadlock pins in the main board. Can not see them very well on the pictures.
I was hoping that the CAN bus low-level protocol was actually implemented in the quadlock because this would have allowed to update the HU hardware if Erisin fix it in a future revision.
Cutting out the CAN-L is a "brutal" approach and I'm sure will limit the communication of the HU with some of the car features. Hopefully, will limit access to stuff that the HU doesn't need anyway or is not critical (i.e. HU controls for ventilation, interior lightning, etc...) We will need to check that after disconnecting CAN-L, things like reverse camera, TPMS, etc... still working correctly.
I was hoping that the CAN bus low-level protocol was actually implemented in the quadlock because this would have allowed to update the HU hardware if Erisin fix it in a future revision.
Cutting out the CAN-L is a "brutal" approach and I'm sure will limit the communication of the HU with some of the car features. Hopefully, will limit access to stuff that the HU doesn't need anyway or is not critical (i.e. HU controls for ventilation, interior lightning, etc...) We will need to check that after disconnecting CAN-L, things like reverse camera, TPMS, etc... still working correctly.
Last edited by Chuck245; 02-19-2024 at 02:57 PM.