Suzuki Wagon R Manual page 734

"P" RANGE TEST
1) Stop vehicle on a slope, shift select lever to "P" range and at the
same time apply parking brake.
2) After stopping engine, depress brake pedal and release parking
brake.
3) Then, release brake pedal gradually and check that vehicle re-
mains stationary.
4) Depress brake pedal and shift select lever to "N" range.
5) Then, release brake pedal gradually and check that vehicle
moves.
WARNING:
Before test, check to make sure no one is around vehicle
or down on a slope and keep watchful for safety during
test.
Test result
Vehicle moves at "P" range or
remains stationary at "N"
range
AUTOMATIC TRANSMISSION (4 A / T) 7B-23
Possible cause
Defective parking lock pawl
or spring