Menurut wiki:
http://en.wikipedia.org/wiki/Cornering_lamp#Cornering_lamps
On some models, white cornering lamps provide extra lateral illumination in the direction of an intended turn or lane change. These are actuated in conjunction with the turn signals, though they burn steadily, and they may also be wired to illuminate when the vehicle is shifted into reverse gear.

Bedanya dengan lampu sen (turn signal) adalah lampu ini terus-menerus menyala. Saya pikir, karena dipakai u/ menandai belok (turn) atau pindah lajur (lane change), lampu ini pasti terletak di samping.


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Note added at 23 mins (2010-11-12 15:34:32 GMT)
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Opps, ada info tambahan:
http://pasaronderdil.com/go/2008/04/27/lampu-sen-depan/
Bos mau tanya nih, kalo harga corner lamp depan (lampu samping warna putih yg nempel dgn lampu utama) untuk toyota corolla ...