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Home >> Toyota >> 2013 >> Prius C >> Repair and Diagnosis (Single Page) >> Steering >> Steering Column >> Steering Lock System (Diagnostic Codes & Symptom Tests) >> Steering Lock System >> Symptom Tests >> Unable to Unlock Steering Wheel (Hybrid Control System cannot Start) >> Inspection Procedure
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Inspection Procedure

NOTE:
  • When using the Techstream with the power switch off, perform either of the following: 1) Turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and vehicle begins, or 2) connect the Techstream to the vehicle, select the vehicle type under manual mode, and then enter the following menus: Body Electrical / Smart Key / Trouble Codes.
  • Perform either of the following operations to lock/unlock the steering:
    • To unlock the steering, carry the key and turn the power switch on (ACC) or on (IG) with the shift lever in P.
    • To lock the steering, turn the power switch off with the shift lever in P, and then open a door.
  • The steering lock system uses LIN communication. First perform the inspections in "How to Proceed with Troubleshooting" to confirm that there are no communication malfunctions before proceeding with troubleshooting. Refer to HOW TO PROCEED WITH TROUBLESHOOTING .
  • After performing repairs, confirm that the problem does not occur.
  • Make sure that no DTCs are output. If any DTCs are output, proceed to the Diagnostic Trouble Code Chart. Refer to DIAGNOSTIC TROUBLE CODE CHART .
  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.
  • When replacing the steering lock ECU (steering lock actuator assembly), certification ECU (smart key ECU assembly) or ID code box (immobiliser code ECU), registration must be performed. Refer to REGISTRATION .
  • When disconnecting the cable from the negative (-) auxiliary battery terminal, some systems need to be initialized after the cable is reconnected. Refer to INITIALIZATION .
  • If the steering lock ECU (steering lock actuator assembly) or certification ECU (smart key ECU assembly) is replaced, be sure to confirm that the steering is unlocked by turning the steering wheel to the left and right before starting the hybrid control system. If the steering is locked for any reason, open and close a door with the power switch off, and then unlock the steering by pressing the power switch. This prevents the hybrid control system from starting while the steering is locked.
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