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Steering Lock System (Diagnostic Codes & Symptom Tests): Other Lexus GS IV

Steering Column ~1431 words

PROCEDURE

  1. CHECK DTC Using the Techstream, check if LIN communication DTC B2785 is output. Refer to «DTC CHECK / CLEAR [03/2012 - ]»(ref-600622-S02267081232014022400000) . HINT: If a LIN communication DTC is output, perform troubleshooting for the LIN communication system. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [03/2012 - ]»(ref-600622-S38803552542014022400000) . Result Result Proceed to DTC B2785 is output. A DTC B2785 is not output. B B --> See step 3 A --> See step 2
  2. GO TO LIN COMMUNICATION SYSTEM (DTC B2785). Refer to «DTC B2785: Communication Malfunction between ECUs Connected by LIN»(ref-600650-S19321650822014022400000)
  3. REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY). Refer to «DISASSEMBLY [03/2012 - ]»(ref-600607-S17635330842014022400000)
  1. CHECK DTC (ALL) Using the Techstream, confirm the output of DTCs for all systems. OK No DTCs are output. NOTE: When using the Techstream with the power switch off to troubleshoot: Connect the Techstream to the DLC3 and turn a courtesy light switch on and off at 1.5 second intervals until communication between the Techstream and vehicle begins. Make sure that no DTCs are output. If any DTCs are output, proceed to Diagnostic Trouble Code Chart. NG --> REPAIR CIRCUITS INDICATED BY OUTPUT DTCS OK: Go to next step
  2. READ VALUE USING TECHSTREAM (LOCK REQUEST RECEIVE) Use the Data List to check if the steering lock command is functioning properly. SMART ACCESS Tester Display Measurement Item/Range Normal Condition Diagnostic Note Lock Request Receive Reception state of steering lock request signal by certification ECU (smart key ECU assembly) and sent to ID code box (immobilizer code ECU) / OK or NG HINT: The reception state is maintained for 10 seconds. When 10 seconds or more elapse after receiving the signal, the item changes to "NG". OK: Within 10 seconds of opening any door with power switch off and shift lever in P NG: Except above If this item does not change to "OK" even though the steering lock conditions are met, the certification ECU (smart key ECU assembly) may be malfunctioning. OK The certification ECU (smart key ECU assembly) receives a lock request signal within 10 seconds of turning the power switch from on (IG) to off and opening a door with the shift lever in P, and OK is displayed on the Techstream screen. NG --> See step 5 OK: Go to next step
  3. INSPECT STEERING LOCK ECU (MOTOR ACTIVATION COMMAND SIGNAL) See step 1 NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  4. CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY) - POWER MANAGEMENT CONTROL ECU) See step 4 NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 14
  5. READ VALUE USING TECHSTREAM (FR DOOR COURTESY SW) Using the Techstream, check the following main body ECU Data List item by opening and closing the driver door to confirm the state of the front door courtesy light switch assembly. MAIN BODY Tester Display Measurement Item/Range Normal Condition Diagnostic Note FL Door Courtesy SW Front door courtesy light switch assembly LH / ON or OFF OFF: Front door LH closed ON: Front door LH open If this item does not change according to the actual state of the driver door, there is a malfunction in the door courtesy light switch or a related part. OK The Data List item changes in accordance with the opening and closing of the driver door. NG --> See step 11 OK: Go to next step
  6. READ VALUE USING TECHSTREAM (S CODE CHECK) Use the Data List to check if S code certification is functioning properly. SMART ACCESS Tester Display Measurement Item/Range Normal Condition Diagnostic Note S Code Check Verification result between certification ECU (smart key ECU assembly) and ID code box (immobilizer code ECU) / OK or NG OK: Verification result normal NG: Verification result abnormal When a malfunction is present: The ID code for the certification ECU (smart key ECU assembly) or ID code box (immobilizer code ECU) is not registered or the certification ECU (smart key ECU assembly) or ID code box (immobilizer code ECU) is malfunctioning. The steering cannot be locked. The steering cannot be unlocked (the hybrid control system cannot be started). OK OK is displayed on the Techstream. HINT: Reasons for verification failure: The certification ECU (smart key ECU assembly) or ID code box (immobilizer code ECU) is malfunctioning. There is a problem with the communication between ECUs. An ECU is replaced, but is not registered. An ECU is replaced with an ECU which has a code already stored in it. NG --> See step 9 OK: Go to next step
  7. READ VALUE USING TECHSTREAM (L CODE CHECK) Use the Data List to check if L code certification is functioning properly. SMART ACCESS Tester Display Measurement Item/Range Normal Condition Diagnostic Note L Code Check Verification result between ID code box (immobilizer code ECU) and steering lock ECU (steering lock actuator assembly) / OK or NG OK: Verification result normal NG: Verification result abnormal When a malfunction is present: The ID code for the ID code box (immobilizer code ECU) or steering lock ECU (steering lock actuator assembly) is not registered or the ID code box (immobilizer code ECU) or steering lock ECU (steering lock actuator assembly) is malfunctioning. The steering cannot be locked. The steering cannot be unlocked (the hybrid control system cannot be started). OK OK is displayed on the Techstream. HINT: Reasons for verification failure: The steering lock ECU (steering lock actuator assembly) or ID code box (immobilizer code ECU) is malfunctioning. There is a problem with the communication between ECUs. An ECU is replaced, but is not registered. An ECU is replaced with an ECU which has a code already stored in it. NG --> See step 10 OK: Go to next step
  8. REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY) Replace the steering lock ECU (steering lock actuator assembly) with a new one. Refer to «DISASSEMBLY [03/2012 - ]»(ref-600607-S17635330842014022400000) . Perform registration procedures. Refer to «REGISTRATION [03/2012 - ]»(ref-600446-S15322006622014022400000) . Turn the power switch on (IG). Turn the steering wheel and check the steering condition. OK Steering is unlocked. NG --> See step 12 OK --> END
  9. REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Replace the certification ECU (smart key ECU assembly) with a new one. Refer to «REMOVAL [03/2012 - ]»(ref-600642-S00554550882014022400000) . Perform registration procedures. Refer to «REGISTRATION [03/2012 - ]»(ref-600446-S15322006622014022400000) . Use the Data List to check if S code certification is functioning properly again. SMART ACCESS Tester Display Measurement Item/Range Normal Condition Diagnostic Note S Code Check Verification result between certification ECU (smart key ECU assembly) and ID code box (immobilizer code ECU) / OK or NG OK: Verification result normal NG: Verification result abnormal When a malfunction is present: The ID code for the certification ECU (smart key ECU assembly) or ID code box (immobilizer code ECU) is not registered or the certification ECU (smart key ECU assembly) or ID code box (immobilizer code ECU) is malfunctioning. The steering cannot be locked. The steering cannot be unlocked (the hybrid control system cannot be started). OK OK is displayed on the Techstream. NG --> See step 15 OK --> END
  10. REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY) Replace the steering lock ECU (steering lock actuator assembly) with a new one. Refer to «DISASSEMBLY [03/2012 - ]»(ref-600607-S17635330842014022400000) . Perform registration procedures. Refer to «REGISTRATION [03/2012 - ]»(ref-600446-S15322006622014022400000) . Use the Data List to check if L code certification is functioning properly again. SMART ACCESS Tester Display Measurement Item/Range Normal Condition Diagnostic Note L Code Check Verification result between ID code box (immobilizer code ECU) and steering lock ECU (steering lock actuator assembly) / OK or NG OK: Verification result normal NG: Verification result abnormal When a malfunction is present: The ID code for the ID code box (immobilizer code ECU) or steering lock ECU (steering lock actuator assembly) is not registered or the ID code box (immobilizer code ECU) or steering lock ECU (steering lock actuator assembly) is malfunctioning. The steering cannot be locked. The steering cannot be unlocked (the hybrid control system cannot be started). OK OK is displayed on the Techstream. NG --> See step 13 OK --> END
  11. GO TO LIGHTING SYSTEM (DOOR COURTESY SWITCH CIRCUIT). Refer to «Door Courtesy Switch Circuit»(ref-600423-S15471360392014022400000)
  12. REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to «REMOVAL [03/2012 - ]»(ref-600642-S00554550882014022400000)
  13. REPLACE ID CODE BOX (IMMOBILIZER CODE ECU). Refer to «REMOVAL [03/2012 - ]»(ref-600642-S19370879682014022400000)
  14. REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY). Refer to «DISASSEMBLY [03/2012 - ]»(ref-600607-S17635330842014022400000)
  15. REPLACE ID CODE BOX (IMMOBILIZER CODE ECU). Refer to «REMOVAL [03/2012 - ]»(ref-600642-S19370879682014022400000)

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