Lexus LX - Steering Lock System System Description; WARNING FUNCTION OF ENGINE SWITCH INDICATOR

STEERING LOCK SYSTEM > SYSTEM DESCRIPTION
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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.
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).
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" (Click here)