Suzuki Wagon R Manual page 319

5E1-18 ANTILOCK BRAKE SYSTEM (ABS)
Example : When right-front wheel speed sensor circuit opens (DTC 21)
"ABS" warning lamp
ON
OFF
DIAGNOSTIC TROUBLE CODE (DTC) CHECK
(USING "ABS" WARNING LAMP)
1) Perform "ABS" WARNING LAMP CHECK described above.
2) Using service wire (1), connect diagnosis switch terminal (2) of
monitor coupler (3) to ground (4).
3) Turn ignition switch ON.
4) Read flashing of "ABS" warning lamp which represents DTC as
shown in example below and write it down. When more than 2
DTCs are stored in memory, flashing for each DTC is repeated
three times starting with the smallest DTC number in increasing
order.
For details of DTC, refer to "DTC Table".
DTC 21
5) After completing the check, turn ignition switch off, disconnect
service wire from monitor coupler.
DTC 21
DTC 21
Time (sec)