2002 Chev. Venture brake lights, high speed heater fan

Two problems: (1) Brake lights: The bar light above the rear window works but the two regular brake lights do not. (2) The high speed on the AC/Heater fan does not work.

Any thoughts? Thanks....

The brake light issue is common. My daughter is on her second Venture of the same vintage. Both have needed a turn signal/multifunction switch for that same problem. However, be absolutely certain the lamps, sockets, and plug-in connector for the rear lights are all intact. That connector and the unique bussing in the tail lamp hosing are also problematic. A voltmeter will be a big help.