Home ReviewsRefund
Home/Lexus/GS/Lexus GS IV (2011-2015)/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 GS IV

Steering Column 3 illustrations ~326 words

PRECAUTION [03/2012 - ]

  1. PRECAUTIONS WHEN CHECKING FOR DTCS When the cable is disconnected from the negative (-) auxiliary battery terminal, the DTCs stored in the steering lock ECU are cleared. Be sure to record any output DTCs immediately. 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 intervals of 1.5 seconds or less until communication between the Techstream and vehicle begins.
  2. PRECAUTION WHEN AUXILIARY BATTERY VOLTAGE IS LOW OR AFTER DISCONNECTING AND RECONNECTING CABLE TO NEGATIVE (-) AUXILIARY BATTERY TERMINAL After the cable is disconnected and reconnected to the negative (-) auxiliary battery terminal, or when the auxiliary battery voltage is low, once the auxiliary battery is restored to its normal state, if the driver door is not opened and then closed with the power switch off, the steering lock may not be able to be released and the hybrid control system may not be able to start.
  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 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 lock by pressing the power switch. This prevents the hybrid control system 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 [03/2012 - ]»(ref-600446-S15322006622014022400000) . Certification ECU (Smart key ECU assembly) Power management control ECU ID code box (Immobilizer code ECU) Steering lock ECU (Steering lock actuator assembly) Electrical key transmitter sub-assembly Main body ECU (Multiplex network body ECU)

Scheme 58

Scheme 58: ILLUSTRATION
Scheme 58: ILLUSTRATION

Scheme 59

Scheme 59: ILLUSTRATION
Scheme 59: ILLUSTRATION

Scheme 60

Scheme 60: SYSTEM DIAGRAM [03/2012 - ]
Scheme 60: SYSTEM DIAGRAM [03/2012 - ]
ComponentOutline
Steering Lock ECU (Steering Lock Actuator Assembly)The steering is locked and unlocked by communicating with the certification ECU (smart key ECU assembly) 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 to turn the power source mode on (READY), start the hybrid control system and unlock and lock the steering.
Power Management Control ECUPermits the steering lock ECU to supply power to activate the motor. The power management control ECU and certification ECU (smart key ECU assembly) permit hybrid control system start after receiving an unlock signal from the steering lock ECU.
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

More articles — Steering Lock System (Diagnostics - Introduction)