TATA Motors Indica V2 Owner's Manual & Service Book page 47

BEFORE DRIVING
Roof Mounted Interior Light & Reading Lamps :
Interior roof lighting and reading lamps with inbuilt switches are
provided on the roof near the rear view mirror.
The switch for the reading lamps, has 3 positions -
LEFT SIDE
READING LAMP
Delayed Turn Off (for deluxe model)
This switch has 3 positions -
OFF DOOR ON
ON - The lamp will come 'ON' as long as switch is in this position.
DOOR - In this position the lamp comes on when either of the
front doors are opened. When the door is closed, the lamp will
not go 'OFF' immediately, but remain 'ON' for a few seconds. This
helps settling in the seat and inserting the key in the Ignition
switch.
When the key is turned to the 'IGN' position, the lamp goes 'OFF'
immediately, before the delay period.
OFF - In this position the lamp will not comes 'ON' at all.
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OFF RIGHT SIDE
READING LAMP
Interiors and Accessories
Reading Lamps
Door Switch