Steering Lock (diagnostics - Introduction) Lexus IS F I

PRECAUTION

1. PRECAUTIONS WHEN WORKING ON ELECTRIC STEERING LOCK After replacing the steering lock actuator assembly (steering lock ECU), perform the key code registration. If the steering lock actuator assembly is replaced, open and close the driver's door. The engine may not start until either operation is performed. HINT: Opening and closing the driver's door causes the steering lock actuator assembly (steering lock ECU) to memorize the correct steering lock bar position. If checking for DTCs of the push-button start function or checking the Data List with the engine switch off, make sure that the driver's door is open. HINT: When the engine switch is off, the main body ECU RH (cowl side junction block RH) may be in a sleep mode. If the main body ECU RH (cowl side junction block RH) is in this sleep mode, it will not be possible to communicate with the Techstream.

Scheme 69

Scheme 70

INPUT AND OUTPUT SIGNALS OF EACH ECU

SYSTEM DESCRIPTION

1. DESCRIPTION The steering lock system locks/unlocks the steering by activating the steering lock bar with a motor. The steering lock ECU activates the motor based on signals from the certification ECU and power source control ECU.
2. FUNCTIONS OF COMPONENTS The steering lock ECU controls the system based on information from the following components. Component Function Steering lock actuator assembly Consists of a motor, lock bar, lock/unlock position sensors, etc. Activated by the steering lock ECU. Steering lock ECU Included in the steering lock actuator assembly. Activates the steering lock motor based on permission signals from the power source control ECU and ID CODE BOX. Detects steering lock/unlock positions and transmits the status to other ECUs. Power source control ECU Permits the steering lock ECU to supply power to activate the motor. The power source control ECU and certification ECU permit engine start after receiving an unlock signal from the steering lock ECU. Certification ECU The power source control ECU and certification ECU permit engine start after receiving an unlock signal from the steering lock ECU. IG2 relay Controlled by the power source control ECU. Sends IG signals to the steering lock ECU. ID CODE BOX Orders the steering lock ECU to lock/unlock the steering.

HOW TO PROCEED WITH TROUBLESHOOTING

HINT

1. Perform troubleshooting in accordance with the following flowchart.
2. *: Use the Techstream.

1. VEHICLE BROUGHT TO WORKSHOP NEXT: Go to next step
2. INSPECT 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. NEXT: Go to next step
3. CHECK AND CLEAR DTCs* NEXT: Go to next step
4. PROBLEM SYMPTOM CONFIRMATION Result Result Proceed to Symptom does not occur. A Symptom occurs. B B --> GO TO STEP 6 A: Go to next step
5. SYMPTOM SIMULATION NEXT: Go to next step
6. CHECK CAN COMMUNICATION SYSTEM* HINT: Check that there are no problems in the CAN communication system before troubleshooting the steering lock system. NEXT: Go to next step
7. DTC CHECK* Check for DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/steering-column/#steering-lock-diagnostics-introduction__dtc-check-clear) . Result Result Proceed to DTC is output. A DTC is not output. B A --> GO TO STEP 9 B: Go to next step
8. PROBLEM SYMPTOMS TABLE Result Result Proceed to Fault is not listed in problem symptoms table. A Fault is listed in problem symptoms table. B B --> GO TO STEP 10 A: Go to next step
9. DTC CHART NEXT: Go to next step
10. CIRCUIT INSPECTION* NEXT: Go to next step
11. PROBLEM IDENTIFICATION NEXT: Go to next step
12. REPAIR OR REPLACEMENT NEXT: Go to next step
13. CONFIRMATION TEST* NEXT --> END

INITIALIZATION

HINT

In vehicles equipped with the push-button start function, the starting function may not be operational after recharging or while jump-starting a discharged battery. This condition is most likely to occur if battery voltage drops below 9 V. The following procedure has been developed to address this condition.

Scheme 71

1. INITIALIZATION PROCEDURE Confirm that the D/C CUT fuse is installed. HINT: If the D/C CUT fuse is not installed, install it at this time. Move the shift lever to P. Turn the engine switch off. Open the driver's door. HINT: Opening the driver's door will start an initialization process between the steering lock ECU and the engine room junction block. Depress the brake pedal. Press the engine switch.

PROBLEM SYMPTOMS TABLE

HINT

1. Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
2. Inspect the fuses and relays related to this system before inspecting the suspected areas below.

STEERING LOCK FUNCTION

PUSH BUTTON START FUNCTION

Scheme 72

1. STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition J29-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 V J29-2 (SGND) - Body ground W-B - Body ground Signal ground Always Below 1 V J29-3 (IGE) - J29-1 (GND) W - W-B Power source for driving motor Motor is in operation Motor is not in operation Below 1 V 10 to 12 V J29-4 (SLP1) - J29-2 (SGND) R - W-B Unlock position sensor output signal Steering is locked Steering lock is released 10 to 14 V Below 1 V J29-5 (LIN) - J29-2 (SGND) V - W-B LIN communication bus Engine switch on (IG) Pulse generation J29-6 (IG2) - J29-1 (GND) LG - W-B IG signal input Engine switch on (IG) 10 to 14 V J29-7 (B) - J29-1 (GND) G - W-B Power source Always 10 to 14 V

Scheme 73

1. DESCRIPTION Diagnostic System When troubleshooting a vehicle with a diagnostic system, the only difference from the usual troubleshooting procedure is connecting the Techstream to the vehicle and reading various data output from the vehicle 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 Techstream to the DLC3 on the vehicle. The Techstream enables the DTCs to be cleared, the indicators to be activated, and the Data List to be checked. The diagnosis information of the steering lock ECU is transmitted to the Techstream via the certification ECU as the steering lock ECU is not connected to BEAN. Check the DLC3. Check the DLC3. Refer to «GENERAL INFORMATION»(/lexus/is-f/i-2007-2014/remont/hoistjack/#introduction) .
2. WARNING FUNCTION OF ENGINE SWITCH INDICATOR 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 Blinks green at 1-second intervals Goes off 30 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-button start system Blinks amber at 2-second intervals Goes off 15 seconds after the engine switch is turned off while blinking There is a short in the devices activating the motor. There is a problem in the steering lock ECU or power source control ECU. Troubleshoot by following "How To Proceed With Troubleshooting". Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(/lexus/is-f/i-2007-2014/remont/steering-column/#steering-lock-diagnostics-introduction__how-to-proceed-with-troubleshooting) .
3. WARNING FUNCTION OF COMBINATION METER 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" Goes off 30 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" Goes off 15 seconds after the engine switch is turned off while blinking There is a short in the devices activating the motor. There is a problem in the steering lock ECU or power source control ECU. Troubleshoot by following "How To Proceed With Troubleshooting". Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(/lexus/is-f/i-2007-2014/remont/steering-column/#steering-lock-diagnostics-introduction__how-to-proceed-with-troubleshooting) .

DTC CHECK / CLEAR

1. CHECK DTCS Turn the engine switch off. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Check for DTCs. Enter the following menus: Body Electrical / Smart Access / Trouble Codes. Confirm the details of the DTCs. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/lexus/is-f/i-2007-2014/remont/steering-column/#steering-lock-diagnostics-introduction__diagnostic-trouble-code-chart) .
2. CLEAR DTCS Turn the engine switch off. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Clear the DTCs. Enter the following menus: Body Electrical / Smart Access / Trouble Codes. According to the display on the Techstream, select the trouble code data display with the clear button.

DATA LIST / ACTIVE TEST

1. DATA LIST HINT: Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time. NOTE: In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not. Turn the engine switch off. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / Smart Access / Data List. According to the display on the Techstream, read the Data List. SMART ACCESS Tester Display Measurement Item/Range Normal Condition Diagnostic Note Steering Lock Sleep Cond Steering lock ECU sleep condition / YES or NO YES: Steering lock ECU sleep mode can be entered NO: Steering lock ECU sleep mode cannot be entered - Steering Lock Start Cond Steering lock ECU start signal / YES or NO YES: Steering lock ECU sent a start signal NO: Steering lock ECU did not send a start signal - Engine Start Condition Engine start condition / OK or NG OK: Engine is allowed to start NG: Engine is not allowed to start - Sensor Value Sensor malfunction / NG (PAST) or OK NG (PAST): Sensor malfunction OK: No malfunction - Power Supply Short Short in ECU / NG (PAST) or OK NG (PAST): Short in ECU OK: No malfunction - Power Supply Open Open in ECU / NG (PAST) or OK NG (PAST): Open in ECU OK: No malfunction - Motor Driver Short Short in driver ECU / NG (PAST) or OK NG (PAST): Short in driver ECU OK: No malfunction - Motor Driver Open Open in driver ECU / NG (PAST) or OK NG (PAST): Open in driver ECU OK: No malfunction - Lock/Unlock Receive Steering lock command reception record / YES or NO YES: Steering lock/unlock signal received NO: Steering lock/unlock signal no received - Lock Bar Stuck Error Lock bar stuck malfunction / NG (PAST) or OK NG (PAST): Lock bar stuck malfunction OK: No malfunction - Push Start Error Push-button start function malfunction / NG (PAST) or OK NG (PAST): Malfunction in push-button start OK: No malfunction - IG2 Status IG2 voltage / OK or OFF ON: 10 to 14 V OFF: Below 1 V - IG(Lin) LIN bus start-up status / ON or OFF ON: LIN bus started-up OFF: LIN bus not started-up - Steering Lock Steering lock condition / Set or Unset Set: Steering lock is set Unset: Steering lock is not set This status changes depending on the state of various sensors Steering Unlock Steering unlock condition / Set or Unset Set: Steering unlock is set Unset: Steering unlock is not set This status changes depending on the state of various sensors

DIAGNOSTIC TROUBLE CODE CHART

If a trouble code is displayed during the DTC check, check the parts listed for that code in the table below and proceed to the appropriate information.

HINT

The steering lock ECU does not store DTCs regarding the past problems.

STEERING LOCK SYSTEM

See also:
• DIAGNOSTIC TROUBLE CODE CHART
• DIAGNOSTIC TROUBLE CODE CHART
• Steering Lock Motor Drive Power Circuit
• DISASSEMBLY
• COMPONENTS
• DTC B2275: STSW Monitor Malfunction
• GENERAL INFORMATION
• DTC CHECK / CLEAR
• INITIALIZATION
• DATA LIST / ACTIVE TEST
• HOW TO PROCEED WITH TROUBLESHOOTING
• DIAGNOSTIC TROUBLE CODE CHART