Suzuki Wagon R Manual page 1630

Low Fuel Warning Lamp
Condition
Low fuel warning light
does not come ON
after ignition switch
turns to ON position
Low fuel warning light
comes ON steady or
flashing
Diagnosis
Possible Cause
Bulb blown
IG METER fuse blown
Combination meter internal circuit faulty
Wiring or grounding faulty
Low fuel
Combination meter internal circuit faulty
Fuel gauge unit faulty
Wiring or grounding faulty
On-Vehicle Service
Low Fuel Warning System
OPERATION
This light comes ON for 4 seconds after ignition switch is turned
to ON position, and goes out.
However, in insufficient fuel level, this light indicates low fuel level
by the following operation.
Low fuel warning light operation :
Low fuel warning
light operation
OFF
ON
Flashing
NOTE:
Low fuel warning light turns off until fuel level in fuel tank
is more than 10 litre (2.2 gal/Imp) if it is turned ON or
flashing once.
SYSTEM INSPECTION
1) Confirm that low fuel warning light comes ON for 4 seconds
2) Remove fuel pump assembly referring to "FUEL TANK" in
3) Check fuel sender gauge referring to "FUEL SENDER
INSTRUMENTATION/DRIVER INFORMATION 8C-3
Fuel level in fuel tank
6.0 litre (1.32 gal/Imp) or more
2.9 – 6.0 litre (0.64 – 1.32 gal/Imp)
0 – 2.9 litre (0 – 0.64 gal/Imp)
after ignition switch turned to ON position, and goes out.
Section 6C.
GAUGE" under "ON-VEHICLE SERVICE" in this Section.
Correction
Check bulb.
Check fuse.
Check combination meter.
Repair.
Refill fuel.
Check combination meter.
Check fuel gauge unit.
Repair.