Suzuki Wagon R Manual page 1548

Rear Wheel Speed Sensor
1. Left rear wheel sensor
2. Trailing arm
3. Sensor ring 5. Right rear wheel sensor
4. Sensor coupler 6. Rear axle housing
OUTPUT VOLTAGE INSPECTION
1) Turn ignition switch OFF.
2) Remove rear seat referring to Section 9.
3) Turn over floor carpet.
4) Hoist vehicle.
5) Disconnect connector of wheel speed sensor.
6) Connect voltmeter between connector (1) terminals.
7) While turning wheel at a speed of approximately 1/2 rotation
Output AC voltage at 1 to 1 1/3 rotation per second
100 mV or more
8) If measured voltage is not as specified, check sensor, rotor
7. Forward
8. Vehicle inside
to 1 rotation per second, check AC voltage of sensor.
and their installation conditions.
ANTILOCK BRAKE SYSTEM (ABS) 5E-37
[A] : For 2WD
[B] : For 4WD