Originally Posted by Sleves
What do you mean?
USA vehicles radios have a built-in sierra module to support ASSIST/911 emergency communication feature (not available in canada).
they both use the same mirror but the canadian one has no buttons.
on start-up, the mirror module attempts to communicate with the sierra module which isn't responding (because it's not equipped). it should stop after a few attempts. however, intermittantly it does not stop and this keeps the radio and communication bus awake after key off.
i have been working with tech support and service engineering on this very issue. yesterday, they shipped me a modified mirror that is supposed to cure this issue.
whenever the customer comes back (not sure when), i'll be replacing his mirror and re-test. i'll post test results in this thread.