Buick Roadmaster Climate Control Unit Diagnostics
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The electronic climate control system in the Buick features self-diagnostics that can be accessed without any special tools. To place your Buick’s electronic climate control system into diagnostic mode, the “TEMP (arrow up)” touch switch must be pressed and held while the “OFF” switch is then pressed (normally within 5 seconds). Upon entry into the diagnostic mode, the LCD will display any fault codes that are present. The service information lists only ten two-digit fault codes numbered 01 through 10.
