TCS Warning Light Is On When Starting Engine, DTC Does Not Appear

Turn ignition off. Disconnect ABS/TCS control unit connectors. Turn ignition on. Measure voltage between ground and terminal No. 3 at ABS/TCS control unit 16-pin harness connector. If battery voltage exists, go to next step. If battery voltage does not exist, repair wiring harness between ABS/TCS control unit and instrument cluster.
Turn ignition off. Measure resistance between ground and diagnostic terminals at DLC. See Figure . If both readings are zero ohms, go to next step. If either reading is more than zero ohms, repair wiring harness as necessary.
Ensure ignition is off and ABS/TCS control unit connectors are disconnected. Measure resistance between ground and terminal No. 4 at DLC. See Figure . If resistance is zero ohms, replace ABS/TCS control unit. If resistance is more than zero ohms, repair wiring harness as necessary.