The fire is burning inside a home in the 1400 block of Sanborn Avenue.
The passengers were stranded in 90-degree heat until emergency crews arrived.
Police in Pasadena have nabbed a transient who they say admitted to setting several trash can fires over the past few weeks.
The terrain is inaccessible by ground units, officials said.
The dry winds and vegetation in the area made it difficult to knock down the flames, but crews said they were gaining the upper hand.
The two fires combined burned less than 5 acres of brush, fire officials reported.
The building is located at Cedros and Nordhoff, authorities said.
A vegetation fire Thursday in Jurupa Valley damaged at least two structures before crews gained the upper hand on the blaze.
Crews Wednesday battled a 20-acre brush fire in Rialto.
A fire in an underground electrical vault in Pasadena Tuesday prompted evacuations and affected some traffic signals, but no injuries were reported.
Firefighters Tuesday knocked down flames at the UCLA School of Dentistry.
The unidentified boy was playing with a cigarette lighter when he started a fire that torched two vehicles and a trailer that belonged to a church, a fire captain said.
A popular dockside restaurant in Dana Point Harbor suffered about $120,000 in damage from a fire in the kitchen, fire officials said Monday.
Firefighters made quick work of a brush fire in the Castaic area Thursday afternoon.
A man was killed and 15 others were injured early Thursday morning in a motel fire in South Los Angeles.