Electric Steering Lock Diagnosis System

Steering. Lexus Is250, Is220D. Gse20 Ale20
Steering Column. Lexus Is250, Is220D. Gse20 Ale20

  1. DESCRIPTION

  1. WARNING FUNCTION OF ENGINE SWITCH INDICATOR

  1. WARNING FUNCTION OF COMBINATION METER

Electric Steering Lock -- Diagnosis System



DESCRIPTION

  1. DIAGNOSTIC SYSTEM
    When troubleshooting a vehicle with a diagnostic system, the only difference from the usual troubleshooting procedure is connecting the intelligent tester to the vehicle and reading various data output from the vehicle's steering lock ECU.
    The steering lock ECU records DTCs when the computer detects a malfunction in the computer itself or in its circuits.
    To check the DTCs, connect the intelligent tester to the DLC3 on the vehicle. The intelligent tester enables the DTCs to be cleared, the indicators to be activated, and the DATA LIST to be checked.

  2. The diagnosis information of the steering lock ECU is transmitted to the tester via the certification ECU as the steering lock ECU is not connected to BEAN.



    3. Lexus Is250, Is220D. Gse20 Ale20.Steering Column.Steering System.Electric Steering Lock Diagnosis System

  3. Check the DLC3.
    The certification ECU follows ISO 15765-04 for its communication protocol. The terminal arrangement of the DLC3 complies with ISO 15031-03 and matches the ISO 15765-04 format.

    Symbols (Terminals No.)
    		Terminal Description
    		Condition
    		Specified Condition
    SIL (7) - SG (5)
    		Bus "+" line
    		During communication
    		Pulse generation
    CG (4) - Body ground
    		Chassis ground
    		Always
    		Below 1 Ω
    SG (5) - Body ground
    		Signal ground
    		Always
    		Below 1 Ω
    BAT (16) - Body ground
    		Battery positive
    		Always
    		11 to 14 V
    HINT:
    If the display shows a communication error message after connecting the intelligent tester cable to the DLC3 and turning the engine switch on (IG), there is a problem with either the vehicle or tester.
    1. If communication is normal when connecting the tester to another vehicle, inspect the DLC3 on the original vehicle.
    2. If communication is still not possible when connecting the tester to another vehicle, the problem is probably on the tester itself. Consult the Service Department listed in the tester's operator's manual.

WARNING FUNCTION OF ENGINE SWITCH INDICATOR


    Lexus Is250, Is220D. Gse20 Ale20.Steering Column.Steering System.Electric Steering Lock Diagnosis System

  1. The steering lock ECU blinks the LED indicator of the engine switch when any of the following problems occurs in the system:

    Detection Item
    		Indicator Light Blink Pattern
    		Indication Status
    		Countermeasure
    Steering lock is still not released
    1. Blinks green at 1-second intervals
    2. Goes off 15 seconds after blinking starts
    		The motor operates to release the steering lock, but the steering lock cannot be released (e.g. the lock bar is stuck in the steering column).
    		Push the engine switch while turning the steering wheel left or right.
    Malfunction in push start system
    1. Blinks amber at 2-second intervals
    2. Goes off 15 seconds after the engine switch is turned off while blinking
    1. There is a short in the devices activating the motor.
    2. There is a problem in the steering lock ECU or power source control ECU.
    		Troubleshoot by following "HOW TO PROCEED WITH TROUBLESHOOTING" (Click here).

WARNING FUNCTION OF COMBINATION METER

  1. The steering lock ECU displays a warning on the combination meter when any of the following problems occurs in the system.

    Detection Item
    		Display
    		Indication Status
    		Countermeasure
    Steering lock is still not released
    		"S/T is not Unlocked"
    1. Goes off 15 seconds after blinking starts
    		The motor operates to release the steering lock, but the steering lock cannot be released (e.g. the lock bar is stuck in the steering column).
    		Push the engine switch while turning the steering wheel left or right.
    Malfunction in push start system
    		"Check S/T Lock"
    1. Goes off 15 seconds after the engine switch is turned off while blinking
    1. There is a short in the devices activating the motor.
    2. There is a problem in the steering lock ECU or power source control ECU.
    		Troubleshoot by following "HOW TO PROCEED WITH TROUBLESHOOTING" (Click here).