SERVICE INFORMATION NOTE: If the information below determines both parts need replacement, do not replace them at different times. Make sure both parts are replaced at the same time. AV Control Unit Replacement Whenever an AV control unit on an applied vehicle is replaced for any reason, check the part number (P/N) of the A/C switch assembly (A/C Controller Assembly). A/C switch assembly (A/C Controller Assembly) Replacement: Whenever an A/C switch assembly on an applied vehicle is replaced for any reason, check the AV control unit?s software version for possible software update. See this bulletin for further detail.
