At Normal Operating Temperature

Stop vehicle and place it level.
Apply parking brake and place chocks against wheels.
With select lever at "P" range, start engine.
Warm up engine till A/T fluid temperature reaches normal operating temperature (70 - 80 °C (158 - 176 °F)). As a guide to check fluid temperature, warm up engine to normal operating temperature.
Keep engine idling and shift selector slowly to "L" and back to "P" range.

Fig 1: Shifting Selector Slowly
Courtesy of SUZUKI OF AMERICA CORP.
With engine idling, pull out dipstick (1), wipe it off with a clean cloth and put it back into place.
Pull out dipstick (1) again and check fluid level indicated on it. Fluid level should be between FULL HOT and LOW HOT. If it is below LOW HOT, add equivalent of DEXRON(R)-III up to FULL HOT.
A/T fluid specification
1. Equivalent of DEXRON(R)-III

NOTE:

DO NOT RACE ENGINE while checking fluid level, even after engine is started.
DO NOT OVERFILL. Overfilling can causes foaming and loss of fluid through breather. Then slippage and transmission failure can result.
If vehicle was driven under high load such as pulling a trailer, fluid level should be checked about half an hour after it is stopped.

Fig 2: Checking Fluid Level At Normal Operating Temperature

Courtesy of SUZUKI OF AMERICA CORP.