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C1223 - Left Rear Wheel Speed Sensor Input Signal is 0C1203 - The procedure for this fault is to check for an open or short in the harness and connector between the Skid control ECU and ECM.If no faults are found with the wiring, then - the MIL stays off when ignition on but engine not running (Requires ECM replacing) - the MIL comes on when ignition on but engine not running (requires ABS & traction actuator assembly) These parts wont be cheap so i hope its a wiring fault If you take it to a Toyota dealership they should be able to do this for you pretty easily.