How do you honk the car's horn in Battlefield 1943 for the PS3?

May be...

Easy points!!! I know it's a dumb question but I don't have a headset and I've seen other players honk at me to get in.

L3 or R3 one of those (the analog sticks)

why would u wanna honk the horn? nah just kidding i think its down on the d pad