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Steering Lock System (Diagnostic Codes & Symptom Tests): Diagnosis Lexus ES XV60

Steering Column 6 illustrations ~2798 words

INSPECTION PROCEDURE

Note. 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. After performing repairs, confirm that no DTCs are output again. Refer to DTC CHECK / CLEAR [06/2012 - ] . When replacing the steering lock ECU (steering lock actuator assembly), registration must be performed. Refer to REGISTRATION [06/2012 - ] .

HINT

When all the ECUs that are connected to the LIN communication cannot communicate with the certification ECU (smart key ECU assembly), DTC B2785 is stored.

Note. 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. The steering lock system uses LIN communication. First perform the inspections in "How to Proceed with Troubleshooting" to confirm that there are no communication malfunctions before proceeding with troubleshooting. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [06/2012 - ] . When disconnecting the cable from the negative (-) battery terminal, some systems need to be initialized after the cable is reconnected. Refer to INITIALIZATION [06/2012 - ] . After performing repairs, perform the DTC output confirmation operation, and then confirm that no DTCs are output again. Refer to DTC CHECK / CLEAR [06/2012 - ] . When replacing the steering lock ECU (steering lock actuator assembly), registration must be performed. Refer to REGISTRATION [06/2012 - ] .

Scheme 121

Scheme 121: PROCEDURE
Scheme 121: PROCEDURE

Scheme 122

Scheme 122
Scheme 122
  1. INSPECT STEERING LOCK ECU (MOTOR ACTIVATION COMMAND SIGNAL) Make sure that there is no looseness at the locking part and the connecting part of the connector. Disconnect the H18 steering lock ECU connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition H18-1 (GND) - Body ground Always Below 1 ohms TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Steering Lock ECU (Steering Lock Actuator Assembly)) Reconnect the H18 steering lock ECU connector. Move the shift lever to P and turn the engine switch off. Check the signal waveform according to the condition(s) in the table below. STANDARD FREQUENCY 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 Component with harness connected (Steering Lock ECU (Steering Lock Actuator Assembly)) *b Steering lock motor not operating *c Steering lock motor operating 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. NG --> See step 4 OK: Go to next step
  2. CLEAR DTC AND DATA LIST MALFUNCTION RECORD Clear the DTCs. Refer to «DTC CHECK / CLEAR [06/2012 - ]»(ref-598668-S23280015182014021400000) . Disconnect the cable from the negative (-) battery terminal, wait for 30 seconds or more, and then reconnect the cable to the negative (-) battery terminal to clear the record of malfunctions stored in the Data List. WARNING: After turning the engine switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notices before proceeding with work. Refer to «PRECAUTION [06/2012 - ]»(ref-598449-S42461431542014021400000) . NEXT: Go to next step
  3. READ VALUE USING TECHSTREAM (POWER SUPPLY SHORT) Perform the DTC output confirmation operation. Check if DTC B2782 is output. Refer to «DTC CHECK / CLEAR [06/2012 - ]»(ref-598668-S23280015182014021400000) . Use the Data List to check if the steering lock control is functioning properly. SMART ACCESS Tester Display Measurement Item/Range Normal Condition Diagnostic Note 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). Result Result Proceed to DTC B2782 is not output. "OK" is displayed on the Techstream. A DTC B2782 is output. "NG(Past)" is displayed on the Techstream. B B --> See step 5 A --> SYSTEM RETURNED TO NORMAL (DTC STORED DUE TO BAD CONNECTION, BUT SYSTEM RETURNED TO NORMAL BY RECONNECTING CONNECTOR)
  4. CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)) Make sure that there is no looseness at the locking part and the connecting part of the connectors. Disconnect the H18 steering lock ECU connector. Disconnect the H56 certification ECU (smart key ECU assembly) connector. Check for deformation and corrosion of the connector case and terminals. OK There is no deformation or corrosion of the connector case or terminals. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition H18-3 (IGE) - H56-29 (SLR+) Always Below 1 ohms H18-3 (IGE) - Body ground Always 10 kohms or higher H56-29 (SLR+) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 6
  5. REPLACE STEERING LOCK ACTUATOR ASSEMBLY. Refer to «DISASSEMBLY [06/2012 - ]»(ref-598450-S40355313682014021400000)
  6. REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to «REMOVAL [06/2012 - ]»(ref-598651-S32321076912014021400000)

Note. 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. The steering lock system uses LIN communication. First perform the inspections in "How to Proceed with Troubleshooting" to confirm that there are no communication malfunctions before proceeding with troubleshooting. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [06/2012 - ] . Inspect the fuses for circuits related to this system before performing the following inspection procedure. After performing repairs, confirm that no DTCs are output again. Refer to DTC CHECK / CLEAR [06/2012 - ] . When replacing the steering lock ECU (steering lock actuator assembly), registration must be performed. Refer to REGISTRATION [06/2012 - ] .

Scheme 123

Scheme 123: PROCEDURE
Scheme 123: PROCEDURE

Scheme 124

Scheme 124
Scheme 124
  1. INSPECT STEERING LOCK ECU (POWER SOURCE MODE SIGNAL) Make sure that there is no looseness at the locking part and the connecting part of the connector. Disconnect the H18 steering lock ECU connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition H18-1 (GND) - Body ground Always Below 1 ohms TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Steering Lock ECU (Steering Lock Actuator Assembly)) Reconnect the H18 steering lock ECU connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition H18-6 (IG2) - H18-1 (GND) Engine switch on (IG) 11 to 14 V H18-6 (IG2) - H18-1 (GND) Engine switch off Below 1 V TEXT IN ILLUSTRATION *a Component with harness connected (Steering Lock ECU (Steering Lock Actuator Assembly)) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 2
  2. REPLACE STEERING LOCK ACTUATOR ASSEMBLY. Refer to «DISASSEMBLY [06/2012 - ]»(ref-598450-S40355313682014021400000)

Note. 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. Perform either of the following operations to lock/unlock the steering: 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. Make sure that no DTCs are output. If any DTCs are output, proceed to the Diagnostic Trouble Code Chart. Refer to DIAGNOSTIC TROUBLE CODE CHART [06/2012 - ] . The steering lock system uses LIN communication. First perform the inspections in "How to Proceed with Troubleshooting" to confirm that there are no communication malfunctions before proceeding with troubleshooting. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [06/2012 - ] . When replacing the steering lock ECU (steering lock actuator assembly), certification ECU (smart key ECU assembly) or ID code box (immobilizer code ECU), registration must be performed. Refer to REGISTRATION [06/2012 - ] . After performing repairs, confirm that the problem does not recur. Inspect the fuses for circuits related to this system before performing the following inspection procedure. When disconnecting the cable from the negative (-) battery terminal, some systems need to be initialized after the cable is reconnected. Refer to INITIALIZATION [06/2012 - ] .

Note. 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. Perform either of the following operations to lock/unlock the steering: 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. The steering lock system uses LIN communication. First perform the inspections in "How to Proceed with Troubleshooting" to confirm that there are no communication malfunctions before proceeding with troubleshooting. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [06/2012 - ] . After performing repairs, confirm that the problem does not recur. Make sure that no DTCs are output. If any DTCs are output, proceed to the Diagnostic Trouble Code Chart. Refer to DIAGNOSTIC TROUBLE CODE CHART [06/2012 - ] . Inspect the fuses for circuits related to this system before performing the following inspection procedure. When replacing the steering lock ECU (steering lock actuator assembly), certification ECU (smart key ECU assembly) or ID code box (immobilizer code ECU), registration must be performed. Refer to REGISTRATION [06/2012 - ] . When disconnecting the cable from the negative (-) battery terminal, some systems need to be initialized after the cable is reconnected. Refer to INITIALIZATION [06/2012 - ] . If the steering lock ECU (steering lock actuator assembly) is replaced, be sure to confirm that the steering is unlocked by turning the steering wheel to the left and right before starting the engine. This function prevents the engine from starting while the steering is locked. If the steering is locked for any reason, open and close a door with the engine switch off, and then unlock the steering by pressing the engine switch.

Scheme 125

Scheme 125: PROCEDURE
Scheme 125: PROCEDURE

Scheme 126

Scheme 126
Scheme 126
  1. CHECK DTC (ALL) See step 1 NG --> REPAIR CIRCUITS INDICATED BY OUTPUT DTCS OK: Go to next step
  2. CHECK ENGINE SWITCH (SWITCH CONDITION) Check the power source mode change. When the key is inside the vehicle and the shift lever is in P, check that pressing the engine switch with the brake pedal released causes the power source mode to change as follows: OK Off --> On (ACC) --> On (IG) --> Off NG --> See step 13 OK: Go to next step
  3. READ VALUE USING TECHSTREAM (UNLOCK REQUEST RECEIVE) Use the Data List to check if the steering lock request is functioning properly. SMART ACCESS Tester Display Measurement Item/Range Normal Condition Diagnostic Note 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. OK Within 10 seconds of turning the engine switch on (ACC) or on (IG) or starting the engine, the Data List item changes to "OK". NG --> See step 6 OK: Go to next step
  4. CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL) Disconnect the H18 steering lock ECU connector. Measure the resistance and voltage according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition H18-1 (GND) - Body ground Always Below 1 ohms NOTE: If the result is not as specified, check for looseness in the ground cable connection. Standard Voltage Tester Connection Condition Specified Condition H18-7 (B) - Body ground Always 11 to 14 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Steering Lock ECU (Steering Lock Actuator Assembly)) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  5. INSPECT STEERING LOCK ECU (MOTOR ACTIVATION COMMAND SIGNAL) Reconnect the H18 steering lock ECU connector. Check the signal waveform according to the condition(s) in the table below. STANDARD FREQUENCY 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 Component with harness connected (Steering Lock ECU (Steering Lock Actuator Assembly)) *b Steering lock motor not operating *c Steering lock motor operating 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. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 11
  6. READ VALUE USING TECHSTREAM (S CODE CHECK) See step 6 NG --> See step 9 OK: Go to next step
  7. READ VALUE USING TECHSTREAM (L CODE CHECK) See step 7 NG --> See step 10 OK: Go to next step
  8. REPLACE STEERING LOCK ACTUATOR ASSEMBLY See step 8 NG --> See step 12 OK --> END
  9. REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) See step 9 NG --> See step 14 OK --> END
  10. REPLACE STEERING LOCK ACTUATOR ASSEMBLY See step 10 NG --> See step 14 OK --> END
  11. REPLACE STEERING LOCK ACTUATOR ASSEMBLY. Refer to «DISASSEMBLY [06/2012 - ]»(ref-598450-S40355313682014021400000)
  12. REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to «REMOVAL [06/2012 - ]»(ref-598651-S32321076912014021400000)
  13. GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function) (PROBLEM SYMPTOMS TABLE). Refer to «PROBLEM SYMPTOMS TABLE [06/2012 - ]»(ref-598458-S04622080682014021400000)
  14. REPLACE ID CODE BOX (IMMOBILIZER CODE ECU). Refer to «REMOVAL [06/2012 - ]»(ref-598651-S37481704612014021400000)

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