Suzuki Wagon R Manual page 3313

7B1-20 AUTOMATIC TRANSAXLE (M13 ENGINE MODEL)
1
"O/D OFF" Lamp Check
1) Turn ignition switch ON.
2) Check that "O/D OFF" lamp (1) lights for about 2 sec. and
then goes OFF.
If anything faulty is found, advance to "Diagnostic Flow Table
A-3" or "Diagnostic Flow Table A-4".
Malfunction Indicator Lamp (MIL) Check
Refer to the same item in Section 6 for checking procedure.
Diagnostic Trouble Code (DTC) Check
1) Turn ignition switch to OFF position.