FMVSS 103

Windshield Defrosting and Defogging Systems

This Standard applies to MPVs, trucks and buses. It specifies requirements for windshield defrosting and defogging systems.

Applicability:

Trucks & MPVs 10,000 GVWR or Less Yes
Trucks More than 10,000 GVWR Yes
Buses 10,000 GVWR or Less Yes
Buses More than 10,000 GVWR Yes
Trailers No 

Read the Complete Standard