Steering Lock System (Diagnostics - Introduction): Diagnosis Lexus ES XV60

HOW TO PROCEED WITH TROUBLESHOOTING [06/2012 - ]

HINT

1. Use the following procedures to troubleshoot the steering lock system.
2. *: Use the Techstream.

1. VEHICLE BROUGHT TO WORKSHOP NEXT: Go to next step
2. CUSTOMER PROBLEM ANALYSIS Interview the customer and confirm the problem. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [06/2012 - ]»(ref-598449-S34618498472014021400000) . NEXT: Go to next step
3. CHECK 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. HINT: A simple method to determine whether the battery is depleted is to operate the horn. NEXT: Go to next step
4. CHECK DTC* Check for DTCs and make a note of any codes that are output. Refer to «DTC CHECK / CLEAR [06/2012 - ]»(ref-598668-S23280015182014021400000) . HINT: When DTCs indicating CAN and/or LIN communication system malfunctions are output, repair the CAN and/or LIN communication systems before performing diagnosis. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [06/2012 - ]»(ref-598635-S10414945732014021400000) for CAN and/or. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [06/2012 - ]»(ref-598669-S13305701672014021400000) for LIN). Result Result Proceed to DTC is not output. (Problem symptom cannot be confirmed or reproduced.) A DTC is not output. (Problem symptom can be confirmed and reproduced.) B Steering lock system DTC is output. C HINT: When steering lock system DTCs are output, refer to Diagnostic Trouble Code Chart. Refer to «DIAGNOSTIC TROUBLE CODE CHART [06/2012 - ]»(ref-598668-S10503130812014021400000) . The steering lock system does not store history DTCs. B --> Go to step 6 C --> Go to step 8 A: Go to next step
5. SYMPTOM SIMULATION Proceed to How to Proceed with Troubleshooting. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [06/2012 - ]»(ref-598449-S34618498472014021400000) . NEXT: Go to next step
6. PROBLEM SYMPTOMS TABLE Proceed to Problem Symptoms Table. Refer to «PROBLEM SYMPTOMS TABLE [06/2012 - ]»(ref-598668-S41469599282014021400000) . 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 8 A: Go to next step
7. OVERALL ANALYSIS AND TROUBLESHOOTING* Proceed to Data List / Active Test. Refer to «DATA LIST / ACTIVE TEST [06/2012 - ]»(ref-598668-S02600782352014021400000) . Proceed to Terminals of ECU. Refer to «TERMINALS OF ECU [06/2012 - ]»(ref-598668-S30486641722014021400000) . NEXT --> Go to step 9
8. CIRCUIT INSPECTION* NEXT: Go to next step
9. REPAIR OR REPLACE NEXT: Go to next step
10. CHECK DTC AGAIN* Clear the DTCs. Refer to «DTC CHECK / CLEAR [06/2012 - ]»(ref-598668-S23280015182014021400000) . Check for DTCs and make a note of any codes that are output. Refer to «DTC CHECK / CLEAR [06/2012 - ]»(ref-598668-S23280015182014021400000) . HINT: Perform the DTC output confirmation operation. Result Result Proceed to DTC is not output. A Steering lock system DTC is output. B B --> GO TO DIAGNOSTIC TROUBLE CODE CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART [06/2012 - ]»(ref-598668-S10503130812014021400000) A --> END

PROBLEM SYMPTOMS TABLE [06/2012 - ]

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 SYSTEM

Scheme 111

Scheme 112

1. TERMINAL INSPECTION TEXT IN ILLUSTRATION *a Component without harness connected (Steering Lock ECU (Steering Lock Actuator Assembly)) - - Measure the voltage and resistance according to the value(s) in the table below. Terminal No. (Symbol) Input/Output Wiring Color Terminal Description Condition Specified Condition Related Data List Item H18-1 (GND) - Body ground - W-B - Body ground Ground* Always Below 1 ohms - H18-3 (IGE) - H18-1 (GND) Input L - W-B Steering lock motor activation command signal (motor activation command signal sent from certification ECU (smart key ECU assembly)) Any door opened when conditions below met, and then steering lock motor activated: Shift lever in P Steering lock unlocked in advance by carrying key and turning engine switch on (IG) After above conditions met, engine switch turned off Pulse generation (see waveform) Smart Access Power Supply Short Unlock Request Receive Lock Request Receive H18-4 (SLP1) - H18-1 (GND) Output P - W-B Steering lock bar position signal (output signal from steering unlock sensor) Steering locked --> unlocked 11 to 14 V --> Below 1.2 V Smart Access Push Start Error Sensor Value H18-5 (LIN) - H18-1 (GND) Input/Output B - W-B LIN communication line - - Smart Access Steering Lock Start Cond H18-6 (IG2) - H18-1 (GND) Input LG - W-B Power source mode signal (IG2 power supply input for entire steering lock actuator assembly)* Engine switch off --> engine switch on (IG) Below 1 V --> 11 to 14 V Smart Access Ignition Switch H18-7 (B) - Body ground Input B - Body ground Power source* Always 11 to 14 V - *: When there is a problem with the power source input, the certification ECU (smart key ECU assembly) may store DTC B2786. NOTE: There is 1 motor and 2 sensors built into the steering lock actuator assembly. HINT: When taking measurements while the lock motor is stopped, it is not necessary to perform any operations. In order to take measurements when the lock motor is operating, perform either of the following operations: To unlock the steering, carry the key and turn the engine switch on (ACC) or on (IG) with the shift lever in P. To lock the steering, turn the engine switch off with the shift lever in P, and then open a door. Waveform Item Content Tester Connection H18-3 (IGE) - H18-1 (GND) Tool Setting 2 V/DIV., 200 ms./DIV. Vehicle Condition Steering lock motor not operating --> Steering lock motor operating --> Steering lock motor not operating TEXT IN ILLUSTRATION *a Steering lock motor not operating *b Steering lock motor operating

DIAGNOSIS SYSTEM [06/2012 - ]

1. DESCRIPTION The steering lock ECU stores DTCs when a malfunction occurs in the system. These DTCs can be confirmed by using the Techstream. NOTE: When using the Techstream with the engine switch off to confirm DTCs or Data List information related to the smart access system with push-button start, the Techstream may not operate unless either of the following is performed: 1) Turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and vehicle begins, or 2) connect the Techstream to the vehicle and select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Access. Do not remove any fuses or disconnect the cable from the negative (-) battery terminal before confirming and recording DTCs as the data stored in the ECUs will be cleared. DTCs may have been stored due to problems unrelated to the steering lock system. Be sure to confirm and record any DTCs output for other systems. The steering lock ECU is not connected to the CAN communication system. Therefore, communication with the Techstream is performed via the certification ECU (smart key ECU assembly). The steering lock ECU only stores DTCs for currently existing malfunctions. History DTCs are not stored.

DTC CHECK / CLEAR [06/2012 - ]

Note. The steering lock ECU does not store history DTCs. If any DTCs are output, confirm and record them as soon as possible. Do not turn the engine switch off or clear the DTCs until the DTCs are confirmed and recorded. DTCs may have been stored due to problems unrelated to the steering lock system. Be sure to confirm and record any DTCs output for other systems. When using the Techstream with the vehicle engine switch off, connect the Techstream to the vehicle and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Access. While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.

1. CHECK FOR DTC (MAIN BODY ECU) 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 / Main Body / Trouble Codes. Check for DTCs.
2. CHECK FOR DTC (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)) HINT: The steering lock system DTCs are output from the steering lock ECU via the certification ECU (smart key ECU assembly). 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 / Trouble Codes. Check for DTCs.
3. CLEAR DTC (MAIN BODY ECU) 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 / Main Body / Trouble Codes. Clear the DTCs.
4. CLEAR DTC (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)) 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 / Trouble Codes. Clear the DTCs.

Scheme 113

1. READ 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 / (desired system) / Data List. According to the display on the Techstream, read the Data List. Using the Techstream, confirm the Data List items to help determine the cause of the problem. NOTE: The steering lock ECU communicates with the Techstream through the certification ECU (smart key ECU assembly) which uses CAN communication. If the CAN communication system or certification ECU (smart key ECU assembly) is malfunctioning, Data List items may not be normal. When using the Techstream with the vehicle engine switch off, connect the Techstream to the vehicle and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Access. While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle. POWER SOURCE CONTROL Tester Display Measurement Item/Range Normal Condition Diagnostic Note Shift P Signal Shift position (P) signal / ON or OFF ON: Shift lever in P OFF: Shift lever not in P Use this item to determine if the shift position switch is malfunctioning. The engine cannot be started when this item is "OFF". Steering Unlock Switch State of steering unlock sensor signal output from steering lock actuator assembly / ON or OFF ON: Steering unlocked (Engine switch on (ACC)) OFF: Steering locked (Engine switch off, door opened) This item can be used to determine the cause of problems when the steering does not lock or unlock. HINT: The steering is considered locked when the lock sensor is ON and the unlock sensor is OFF. The steering is considered unlocked when the lock sensor is OFF and the unlock sensor is ON. Str Lock/Unlock Wait T-Out Steering lock or unlock malfunction / Yes or No Yes: Steering lock/unlock timed out (Lock bar stuck, etc.) No: Steering locks/unlocks normally within specified time The engine cannot be started when this item is "Yes". SMART ACCESS Tester Display Measurement Item/Range Normal Condition Diagnostic Note Ignition Switch State of certification ECU (smart key ECU assembly) IG power supply input / ON or OFF ON: Engine switch on (IG) OFF: Engine switch off This item displays "OFF" when the engine switch is on (ACC). Immobilizer State of immobilizer system determined by certification ECU (smart key ECU assembly) / Set or Unset Set: Immobilizer set (Engine switch off) Unset: Immobilizer unset (Engine switch on (ACC) or on (IG)) When the immobilizer cannot be unset, this item can be used to determine whether the certification ECU (smart key ECU assembly) or ID code box (immobilizer code ECU) is part of the problem. The engine cannot be started when this item displays "Set". HINT: The state of the immobilizer (whether it is set or unset) can be determined through the certification ECU (smart key ECU assembly). If this item displays "Set", the communication between the certification ECU (smart key ECU assembly) and ID code box (immobilizer code ECU) can be determined to be normal. The security indicator light operation is only linked with the state of the immobilizer (set/unset), and is not related to the steering lock operation (lock/unlock), when the immobilizer is set, the security indicator light blinks. Steering Lock Sleep Cond Steering lock ECU sleep condition / Yes or No - - Steering Lock Start Cond Transmission state of steering lock ECU wake up signal / Yes or No Yes: Wake up signal transmitted No: Wake up signal not transmitted - Engine Start Condition State of engine start permission signal determined by steering lock ECU and sent to certification ECU (smart key ECU assembly) / OK or NG OK: Engine start permitted NG: Engine start prohibited When this item displays "OK", the certification ECU (smart key ECU assembly) has received an unlock confirmation signal from the steering lock ECU and has permitted fuel injection and engine combustion. The engine cannot be started when this item displays "NG". Sensor Value Record of malfunction of lock or unlock sensor in steering lock actuator assembly / OK or NG(Past) OK: No record of lock/unlock sensor malfunction in steering lock actuator assembly NG(Past): Record of lock/unlock sensor in steering lock actuator assembly turning ON at same time exists When this item displays "NG", the sensor inside the steering lock actuator assembly may be malfunctioning, or there may be a mechanical malfunction. Power Supply Short Record of malfunction of signal sent to steering lock motor (steering lock actuator assembly) from certification ECU (smart key ECU assembly) (short circuit) / OK or NG(Past) OK: No record of malfunction (short circuit) NG(Past): Record of malfunction (short circuit) exists This item records malfunctions in the circuit between the certification ECU (smart key ECU assembly) and steering lock motor (steering lock actuator assembly). Motor Driver Short Record of malfunction of motor activation circuit in steering lock actuator assembly (short circuit) (DTC B2781 stored) / OK or NG(Past) OK: No record of malfunction (short circuit) NG(Past): Record of malfunction (short circuit) exists This item records malfunctions in the motor activation circuit inside the steering lock actuator assembly (short circuit). Lock/Unlock Receive Reception state of steering lock or unlock request signal from certification ECU (smart key ECU assembly) / Yes or No Yes: Record of receiving lock or unlock request signal exists No: No record of receiving lock or unlock request signal - Lock Bar Stuck Error Record of lock bar not properly unlocking after being commanded to unlock for certain amount of time / OK or NG(Past) OK: No record of stuck lock bar NG(Past): Record of stuck lock bar exists - Push Start Error Record of malfunction of push-start function due to steering lock actuator assembly / OK or NG(Past) OK: No record of push-start function malfunction NG(Past): Record of push-start function malfunction exists - Engine Start Request Reception state of engine start permission signal determined by steering lock actuator assembly and sent to certification ECU (smart key ECU assembly) / OK or NG OK: Receiving signal NG: Not receiving signal When this item displays "OK", the certification ECU (smart key ECU assembly) has received an unlock confirmation signal from the steering lock ECU and has permitted fuel injection and engine combustion. The engine cannot be started when this item displays "NG". S Code Check Verification result between certification ECU (smart key ECU assembly) and ID code box (immobilizer code ECU) / OK or NG OK: Verification result normal NG: Verification result abnormal When a malfunction is present: The ID code for the certification ECU (smart key ECU assembly) or ID code box (immobilizer code ECU) is not registered or the certification ECU (smart key ECU assembly) or ID code box (immobilizer code ECU) is malfunctioning. The steering cannot be locked. The steering cannot be unlocked (the engine cannot be started). L Code Check Verification result between ID code box (immobilizer code ECU) and steering lock ECU / OK or NG OK: Verification result normal NG: Verification result abnormal When a malfunction is present: The ID code for the ID code box (immobilizer code ECU) or steering lock ECU is not registered or the ID code box (immobilizer code ECU) or steering lock ECU is malfunctioning. The steering cannot be locked. The steering cannot be unlocked (the engine cannot be started). Unlock Request Receive Reception state of steering unlock request signal by certification ECU (smart key ECU assembly) and sent to ID code box (immobilizer code ECU) / OK or NG HINT: The reception state is maintained for 10 seconds. When 10 seconds or more have elapsed after receiving the signal, the item changes to "NG". OK: Within 10 seconds of turning engine switch on (IG) or on (ACC) or starting engine NG: Except above If the unlock signal has not been received, the engine cannot be started. If this item does not change to "OK" even though the steering unlock conditions are met, the certification ECU (smart key ECU assembly) may be malfunctioning. Lock Request Receive Reception state of steering lock request signal by certification ECU (smart key ECU assembly) and sent to ID code box (immobilizer code ECU) / OK or NG HINT: The reception state is maintained for 10 seconds. When 10 seconds or more have elapsed after receiving the signal, the item changes to "NG". OK: Within 10 seconds of opening any door with engine switch off and shift lever in P NG: Except above If this item does not change to "OK" even though the steering lock conditions are met, the certification ECU (smart key ECU assembly) may be malfunctioning. S Code Check(Past) Verification result between certification ECU (smart key ECU assembly) and ID code box (immobilizer code ECU) (Past) / OK or NG(Past) OK: Verification result normal NG(Past): Verification result abnormal (Past) - L Code Check(Past) Verification result between ID code box (immobilizer code ECU) and steering lock ECU (Past) / OK or NG(Past) OK: Verification result normal NG(Past): Verification result abnormal (Past) - Steering Lock State of whether steering lock ECU has determined steering is locked / Set or Unset Set: Steering locked Unset: Steering unlocked If this item displays "Unset", the steering does not lock. Steering Unlock State of whether steering lock ECU determined steering is unlocked / Set or Unset Set: Steering unlocked Unset: Steering locked If this item displays "Unset", the steering does not unlock (engine cannot be started). HINT: Unlock operation conditions for the steering lock: When the following condition is met, the unlock operation is performed: The engine switch is on (ACC) or on (IG). When the engine switch is turned on (ACC) or on (IG) and the key and certification ECU (smart key ECU assembly) are verified, the steering is unlocked. When any of the following conditions are met, key verification is performed. The brake pedal is depressed so that the engine can be started. 30 seconds have elapsed after opening and closing a door. The engine switch is pressed. Key verification occurs when the code emitted from the key and the code stored in the certification ECU (smart key ECU assembly) are compared to check that they match. Certification ECU (smart key ECU assembly) verification occurs when the S code and L code are verified while the engine is being started or the engine switch is being pushed. The ID code box (immobilizer code ECU) uses the S code to determine whether the certification ECU (smart key ECU assembly) is authorized. The steering lock ECU uses the L code to determine whether the ID code box (immobilizer code ECU) is authorized. Lock operation conditions for the steering: When the following conditions are met and the certification ECU (smart key ECU assembly) has been verified, the lock operation is performed. The engine switch is off. The shift lever is in P. A door is opened or a door lock operation (smart door lock, wireless door lock or key-linked lock) is performed. HINT: The following example shows the behavior of various Data List items when the shift lever is in P, the brake pedal is not depressed, the vehicle is normal and the power source mode changes. HINT: Get into the vehicle while carrying the key. With the engine switch off, the shift lever in P and all the doors closed, perform the following procedures and check the power source mode. *1: Without depressing the brake pedal, press the engine switch and check that the power source mode changes to on (ACC). *2: Without depressing the brake pedal, press the engine switch and check that the power source mode changes to on (IG). *3: Press the engine switch and check that the power source mode changes to off. *4: Release the brake pedal, open the driver door and check that the steering locks. MAIN BODY Tester Display Measurement Item/Range Normal Condition Diagnostic Note FL Door Courtesy SW Front door courtesy light switch assembly LH / ON or OFF ON: Front door LH open OFF: Front door LH closed If this item does not change according to the actual state of the driver door, there is a malfunction in the door courtesy light switch or related part.

DIAGNOSTIC TROUBLE CODE CHART [06/2012 - ]

STEERING LOCK SYSTEM