Suzuki Wagon R Manual page 3329

7B1-36 AUTOMATIC TRANSAXLE (M13 ENGINE MODEL)
Condition
TCC (lock-up) function
does not operate
Possible Cause
Malfunction of TCC solenoid valve
Malfunction of shift solenoid valve-A and/or-B
Malfunction of brake light switch
Malfunction of engine coolant temperature sen-
sor
Malfunction of output shaft speed sensor (VSS)
Malfunction of input shaft speed sensor
Malfunction of throttle position sensor
Malfunction of transmission range sensor
Malfunction of transmission fluid temperature
sensor
Malfunction of pressure control solenoid valve
Faulty valve body component
Faulty torque converter
Correction
Inspect. If NG, replace.
Inspect. If NG, replace valve body
assembly.
Replace valve body assembly.
Replace.