1998 Buick Riviera Owner's Manual - Page 152

iteering Wheel Controls for Climate 2ontrol (Option) If your vehicle has this feature, you can control the temperature comfort setting by usingthe control button on your steering wheel. Passenger Zone Comfort Control T M : Press either arrow once and current comfort E P the setting will be displayed. Press the arrow again to up choose a warmer comfort setting and press down the arrow again to choose a cooler comfort setting. The front seat passenger can control air temperature the in their seating area. This system can be activated by turning COMFORT the CONTROL knob on the passenger's door. 3-9