Riviera Models
WARNING: This page is about a different car, the 1986 Oldsmobile Toronado and 1986 Buick Riviera. However, it is still accessible from the selected car via links, so may be relevant.
When in the "Service Mode", the climate control will continue to operate in whatever setting it was in prior to the "Service Mode". Also, during "Service Mode" operation, the climate control can be operated the same as normal by touching the climate control border key pad and calling up the climate control page.
To get back to the "Service Mode" page, touch the border key pad marked diagnostics. The climate control and diagnostic border key pads are the only 2 border key pads that will operate in the "Service Mode".
After trouble codes have been displayed, the "Service Mode" can be used to perform several tests on different systems one at a time. A specific system may be selected for testing, or a segment check can be performed.