"Too many communication errors" connecting to HVAC on A4
#1
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"Too many communication errors" connecting to HVAC on A4
I can rarely connect to the HVAC controller on both my B5 A4 and S4. Typically I time out with a "too many errors..." message.
3rd party cable (usb). vag-com 409.11.
Any wisdom out there? STFA but no answers...
Many thanks.
3rd party cable (usb). vag-com 409.11.
Any wisdom out there? STFA but no answers...
Many thanks.
#3
Those HVAC controllers are pretty fussy about timing
and 3rd party USB interfaces are quite poor at maintaining precise timing because they emulate a serial port and this emulation tends to slow things down.
-Uwe-
-Uwe-
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#4
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As I feared. I'll try with my laptop on AC...
...which ups the clockrate by 2x. Since you mention,
>>>emulation tends to slow things down
it might help with the com timing precision.
Let you know.
Cheers.
>>>emulation tends to slow things down
it might help with the com timing precision.
Let you know.
Cheers.
#6
actually, I've got to disagree here...
I've got the real thing (Hex-USB with 512.4), and have a LOT of problems connecting, or maintaining a solid connection with HVAC controllers in late '90s and early '00s cars. Flaky enough that I can rarely perform basic settings.
#7
As I said, those modules are quite fussy.
But the HEX-USB should be able to do it without any problem, *if* there's no other issues with the PC.
What kind of PC? What version of Windows? Have you been to the link below?
-Uwe-<ul><li><a href="http://www.ross-tech.com/vag-com/faq_2.html#2.5">http://www.ross-tech.com/vag-com/faq_2.html#2.5</a</li></ul>
What kind of PC? What version of Windows? Have you been to the link below?
-Uwe-<ul><li><a href="http://www.ross-tech.com/vag-com/faq_2.html#2.5">http://www.ross-tech.com/vag-com/faq_2.html#2.5</a</li></ul>
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