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Home >> Scion >> 2012 >> tC Automatic Trans >> 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 (Engine cannot Start) >> Inspection Procedure

Inspection Procedure

NOTE:
  • When using the Techstream with the engine 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 electrical key transmitter and turn the engine switch on (ACC) or on (IG) while the shift lever is in P (for Automatic Transaxle).
    • To lock the steering, turn the engine switch off with the shift lever in P (for Automatic Transaxle), 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 .
  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.
  • Make sure that no DTCs are output. If any DTCs are output, proceed to the appropriate Diagnostic Trouble Code Chart. Refer to DTC CHECK / CLEAR .
  • When replacing the steering lock actuator assembly (steering lock ECU), certification ECU (smart key ECU assembly) or ID code box (immobiliser code ECU), registration must be performed. Refer to REGISTRATION .
  • If the steering lock actuator assembly (steering lock ECU) is replaced, be sure to confirm that the steering is unlocked by turning the steering wheel to the left and right before starting the engine. If the steering is locked for any reason, open and close a door with the engine switch off, and then unlock the steering by pressing the engine switch. This prevents the engine from starting while the steering is locked.
  • After completing repairs, confirm that the problem does not reoccur.
  • When disconnecting the cable from the negative (-) battery terminal, some systems need to be initialized after the cable is reconnected. Refer to INITIALIZATION .

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RELATED DATA LIST AND ACTIVE TEST ITEMS

Problem Symptom Data List Item Active Test Item
Unable to unlock steering wheel (Engine cannot start) Smart Key  -
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