The switch with a tire with chains on it is a reduction of traction control. Snow chains don't work well (they say, been 35 years since I've driven in snow) unless the wheels slip a bit.

The late SELs had a two tone horn. The other switch changes the tone.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician