BCM4322 - How to get WIFI working?

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BCM4312 - Wifi not working on my Dell Studio 1735

Wifi isn't working on my laptop Dell Studio . He didn't find no networks. Network: Device-1: Broadcom NetLink BCM5784M Gigabit Ethernet PCIe vendor: Dell driver: tg3 v: kernel port: 10c0 bus-ID: 09:00.0 IF: enp9s0 state: down mac: Device-2: Broadcom BCM4312 802.11b/g LP-PHY vendor: Dell Wireless 1397 WLAN Mini-Card driver: b43-pci-bridge v: N/A port: 10c0 bus-ID: 0c:00.0