Home ReviewsRefund
Home/Lexus/IS/Lexus IS III (2013-2016)/Repair manual/Steering Column/Steering Lock System (Diagnostics - Introduction): Other
Contents Wiring diagrams Section: Steering Column All sections

Steering Lock System (Diagnostics - Introduction): Other Lexus IS III

Steering Column 3 illustrations ~1010 words

PRECAUTION [04/2013 - ]

  1. PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE BATTERY TERMINAL NOTE: When disconnecting the cable from the negative (-) battery terminal, initialize the following system(s) after the cable is reconnected: System See Procedure Air Conditioning System Refer to «INITIALIZATION [04/2013 - ]»(ref-665529-S01115916402014102400000) Variable Gear Ratio Steering System
  2. PRECAUTIONS WHEN CHECKING FOR DTCS When the cable is disconnected from the negative (-) battery terminal, the DTCs stored in the steering lock ECU (steering lock actuator assembly) are cleared. Be sure to record any output DTCs immediately. Normally, with the engine switch off, even if the Techstream is connected to the vehicle, the information stored in the smart access system with push button start related ECUs (the certification ECU (smart key ECU assembly), main body ECU, etc.) cannot be read. However, smart access system with push button start DTCs and Data List information can be confirmed even if the engine switch is off using either of the two methods below: Connect the Techstream to the vehicle and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins (the Techstream screen changes when communication begins). Connect the Techstream to the vehicle and select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Access.
  3. PRECAUTIONS WHEN REPLACING STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY) If the steering lock ECU (steering lock actuator 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 engine. If the steering is locked for any reason, open and close a door with the engine switch off, and then unlock the steering lock by pressing the engine switch. This prevents the engine from starting while the steering is locked.
  4. PRECAUTION FOR REGISTRATION If replacing any of the following parts, refer to the registration procedures. Refer to «REGISTRATION [04/2013 - ]»(ref-665555-S15306758692014102400000) Certification ECU (Smart key ECU assembly) ECM Steering lock ECU (Steering lock actuator assembly) Key (Electrical key transmitter sub-assembly) ID code box (Immobilizer code ECU) Main body ECU (Multiplex network body ECU)
  5. PRECAUTIONS FOR STEERING LOCK/UNLOCK FUNCTION After turning the engine switch off and opening and closing any of the doors, the steering wheel will be locked due to the steering lock function. Operating the engine switch again automatically cancels the steering lock function. To prevent the steering lock motor from overheating, the motor operation may be suspended if the steering is locked and unlocked repeatedly in a short period of time. In this case, refrain from operating the engine switch. After about 10 seconds, the steering lock motor will resume functioning.

Scheme 68

Scheme 68: ILLUSTRATION
Scheme 68: ILLUSTRATION
*1ECM*2NO. 2 ENGINE ROOM RELAY BLOCK AND NO. 2 JUNCTION BLOCK ASSEMBLY - IG2 RELAY - IG2-MAIN FUSE

Scheme 69

Scheme 69: ILLUSTRATION
Scheme 69: ILLUSTRATION
*AFor Manual Tilt and Manual Telescopic Steering Column*BFor Power Tilt and Power Telescopic Steering Column
*1MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)*2ID CODE BOX (IMMOBILIZER CODE ECU)
*3CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)*4INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - IGN NO. 2 FUSE - STRG LOCK FUSE
*5DLC3*6STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY)

Scheme 70

Scheme 70: SYSTEM DIAGRAM [04/2013 - ]
Scheme 70: SYSTEM DIAGRAM [04/2013 - ]
ComponentOutline
Steering Lock ECU (Steering Lock Actuator Assembly)The steering is locked and unlocked by communicating with the certification ECU (smart key ECU assembly) and ID code box (immobilizer code ECU) via LIN communication. When the following conditions are met, the steering can be unlocked. The codes (L codes) of the ID code box (immobilizer code ECU) and steering lock match. The codes (S codes) of the ID code box (immobilizer code ECU) and certification ECU (smart key ECU assembly) match. The certification ECU (smart key ECU assembly) and key ID codes match.
Certification ECU (Smart Key ECU Assembly)The ID code of the key the user is carrying is sent to the electrical key antenna. The certification ECU (smart key ECU assembly) compares the key ID code it receives from the electrical key antenna with its own ID code. If they match, the certification ECU (smart key ECU assembly) permits the steering lock ECU (steering lock actuator assembly) to turn the power on, start the engine and unlock and lock the steering. Outputs a command to supply power to the steering lock motor based on the power source mode, shift position and vehicle speed signal.
ID Code Box (Immobilizer Code ECU)Receives immobilizer set and unset commands from the certification ECU (smart key ECU assembly) via LIN communication and sends them to the ECM.

CIRCUIT DESCRIPTION

CAUTION / NOTICE / HINT

HINT

  1. Use the following procedures to troubleshoot the steering lock system.
  2. *: Use the Techstream.

PROCEDURE

  1. VEHICLE BROUGHT TO WORKSHOP Result Proceed to NEXT Result: 1 NEXT See step 2
  2. CUSTOMER PROBLEM ANALYSIS Interview the customer and confirm the problem. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [04/2013 - ]»(ref-665529-S21853141262014102400000) Result Proceed to NEXT Result: 1 NEXT See step 3
  3. CHECK BATTERY VOLTAGE Standard Voltage 11 to 14 V If the voltage is below 11 V, recharge or replace the battery before proceeding to the next step. HINT: A simple method to determine whether the battery is depleted is to operate the horn. Result Proceed to NEXT Result: 1 NEXT See step 4
  4. CHECK DTC* Check for DTCs and make a note of any codes that are output. Refer to «DTC CHECK / CLEAR [04/2013 - ]»(ref-665831-S16264057272014102400000) Body Electrical > Main Body > Trouble Codes Body Electrical > Smart Access > Trouble Codes HINT: When DTCs indicating CAN and/or LIN communication system malfunctions are output, repair the CAN and/or LIN communication systems before performing diagnosis. for CAN communication system: Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [04/2013 - ]»(ref-665785-S15342612202014102400000) for LIN communication system: Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [04/2013 - ]»(ref-665832-S17970494342014102400000) Result Result Proceed to DTCs are not output. (Problem symptom cannot be confirmed or reproduced.) A DTCs are not output. (Problem symptom can be confirmed and reproduced.) B Steering lock system DTCs are output. C HINT: When steering lock system DTCs are output, refer to Diagnostic Trouble Code Table. Refer to «DIAGNOSTIC TROUBLE CODE TABLE [04/2013 - ]»(ref-665831-S41545522552014102400000) The steering lock system does not store history DTCs. Result: 2 B See step 6 Result: 3 C See step 8 Result: 1 A See step 5
  5. SYMPTOM SIMULATION Proceed to How to Proceed with Troubleshooting. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [04/2013 - ]»(ref-665529-S21853141262014102400000) Result Proceed to NEXT Result: 1 NEXT See step 6
  6. PROBLEM SYMPTOMS TABLE Proceed to Problem Symptoms Table. Refer to «PROBLEM SYMPTOMS TABLE [04/2013 - ]»(ref-665831-S05884727922014102400000) Result Result Proceed to Fault is not listed in Problem Symptoms Table. A Fault is listed in Problem Symptoms Table. B Result: 2 B See step 8 Result: 1 A See step 7
  7. OVERALL ANALYSIS AND TROUBLESHOOTING* Proceed to Data List/Active Test. Refer to «DATA LIST/ACTIVE TEST [04/2013 - ]»(ref-665831-S11184234712014102400000) Proceed to Terminals of ECU. Refer to «TERMINALS OF ECU [04/2013 - ]»(ref-665831-S08910356582014102400000) Result Proceed to NEXT Result: 1 NEXT See step 9
  8. CIRCUIT INSPECTION* Result Proceed to NEXT Result: 1 NEXT See step 9
  9. REPAIR OR REPLACE Result Proceed to NEXT Result: 1 NEXT See step 10
  10. CHECK DTC AGAIN* Clear the DTCs. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665831-S16264057272014102400000) Body Electrical > Main Body > Clear DTCs Body Electrical > Smart Access > Clear DTCs Check for DTCs and make a note of any codes that are output. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665831-S16264057272014102400000) Body Electrical > Main Body > Trouble Codes Body Electrical > Smart Access > Trouble Codes HINT: Perform the DTC output confirmation operation. Result Result Proceed to DTCs are not output. A Steering lock system DTCs are output. B Result: 1 A END Result: 2 B GO TO DIAGNOSTIC TROUBLE CODE TABLE. Refer to «DIAGNOSTIC TROUBLE CODE TABLE [04/2013 - ]»(ref-665831-S41545522552014102400000)

More articles — Steering Lock System (Diagnostics - Introduction)