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Last Modified: 11-27-2007 1.6 D
Service Category: Steering Section: Steering Column
Model Year: 2008 Model: LX570 Doc ID: RM000001T1900BX
Title: STEERING COLUMN: STEERING LOCK SYSTEM: SYSTEM DESCRIPTION (2008 LX570)

SYSTEM DESCRIPTION

1. DESCRIPTION

(a) The steering lock system locks and unlocks the steering lock by activating the steering lock bar with a motor. The steering lock ECU activates the motor based on permission signals from the certification ECU (smart key ECU assembly) and main body ECU.

2. FUNCTIONS OF COMPONENTS

Item

Function

Steering lock actuator assembly

Includes motor, lock bar and lock and unlock position sensors. Activated by steering lock ECU.

Steering lock ECU

Included in steering lock actuator assembly. Activates steering lock motor based on permission signals from main body ECU and certification ECU (smart key ECU assembly).

Detects steering lock and unlock positions and transmits status to other ECUs.

Main body ECU

Permits steering lock ECU to supply power to activate motor. Main body ECU and certification ECU (smart key ECU assembly) permit engine start after receiving unlock signal from steering lock ECU.

Certification ECU (Smart key ECU assembly)

Orders steering lock ECU to lock or unlock steering lock. Main body ECU and certification ECU (smart key ECU assembly) permit engine start after receiving unlock signal from steering lock ECU.

Integration relay (IG2 relay)

Controlled by main body ECU. Sends IG signals to steering lock ECU.

ID code box (Immobiliser code ECU)

Transmits command to set or cancel immobiliser to ECM based on permission signals from certification ECU (smart key ECU assembly).

3. WARNING FUNCTION OF ENGINE SWITCH INDICATOR

(a) The main body ECU blinks the LED indicator of the engine switch when any of the following problems occur in the system.

Detection Item

Indicator Blink Pattern

Indication Status

Countermeasure

Steering lock release malfunction
  • Blinks in green at 1-second intervals
  • Goes off 30 seconds after blinking starts

Motor operates to release steering lock, but steering lock cannot be released (e.g. lock bar stuck in steering column)

Push engine switch while turning steering wheel to right and left

Malfunction in push button start function
  • Blinks in amber at 2-second intervals
  • Goes off 15 seconds after blinking starts
  • Short in devices for activating motor
  • Problem in steering lock ECU or main body ECU

Troubleshoot by following "How to Proceed with Troubleshooting" STEERING COLUMN: STEERING LOCK SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING (2008 LX570)