Comfort CAN Troubleshoot
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Comfort CAN Troubleshoot
Been putting in many many hours arguing with AI on this one - granted it has actually been useful.
I have a 2006 S. There is something corrupting the Comfort CAN bus. Something is leaking battery voltage on CAN-L.
To try to find it, I have been unplugging pretty much every module that is tied to Comfort CAN. It is now down to 9.9 volts CAN-H is 0 when all asleep.
When something wakes up the CAN, the voltage gets biased to what appears to be normal ~4v. But then at sleep goes back to over 9v.
I am currently measuring at the left front door harness.
Modules unplugged - ALL door modules, gauge cluster, Gateway, KESSY, Wiper Motor, both Seat Memory, InfoTainment, HVAC Display, Rear module, Tow module
The symptoms btw are that diag says Comfort OFF and Infotainment won't start because doesn't get Wake
Any experience or thoughts?
I have a 2006 S. There is something corrupting the Comfort CAN bus. Something is leaking battery voltage on CAN-L.
To try to find it, I have been unplugging pretty much every module that is tied to Comfort CAN. It is now down to 9.9 volts CAN-H is 0 when all asleep.
When something wakes up the CAN, the voltage gets biased to what appears to be normal ~4v. But then at sleep goes back to over 9v.
I am currently measuring at the left front door harness.
Modules unplugged - ALL door modules, gauge cluster, Gateway, KESSY, Wiper Motor, both Seat Memory, InfoTainment, HVAC Display, Rear module, Tow module
The symptoms btw are that diag says Comfort OFF and Infotainment won't start because doesn't get Wake
Any experience or thoughts?
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CUE99T
Bentley
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Jan 3, 2026 03:50 PM
