HOW TO PROCEED WITH TROUBLESHOOTING
HINT
*: Use the Techstream.
- VEHICLE BROUGHT TO WORKSHOP NEXT: Go to next step
- INSPECT BATTERY VOLTAGE Standard voltage 11 to 14 V HINT: If the voltage is below 11 V, recharge or replace the battery before proceeding. NEXT: Go to next step
- CHECK AND CLEAR DTC* NEXT: Go to next step
- PROBLEM SYMPTOM CONFIRMATION Result Result Proceed to Symptom does not occur A Symptom occurs B B --> Go to next step A: Go to next step
- SYMPTOM SIMULATION NEXT: Go to next step
- CHECK MULTIPLEX COMMUNICATION SYSTEM HINT: Check that there are no problems in the multiplex communication system before troubleshooting the steering lock system. NEXT: Go to next step
- DTC CHECK* Result Result Proceed to No output A DTC is output B B --> Go to next step A: Go to next step
- 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 next step A: Go to next step
- DTC CHART NEXT: Go to next step
- CIRCUIT INSPECTION* NEXT: Go to next step
- PROBLEM IDENTIFICATION NEXT: Go to next step
- REPAIR OR REPLACEMENT NEXT: Go to next step
- CONFIRMATION TEST* NEXT --> END
PROBLEM SYMPTOMS TABLE
HINT
Use the table below to help determine the cause of the problem 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.
| Symptom | Suspected Area | See |
|---|---|---|
| Steering wheel cannot be unlocked (the engine cannot be started). | 1. Check for DTCs in the smart access system with push-button start | Refer to DIAGNOSTIC TROUBLE CODE CHART |
| 2. Check for DTCs in the engine immobiliser system | Refer to DIAGNOSTIC TROUBLE CODE CHART | |
| 3. Check that the "Lock/Unlock Receive" item in the Data List of the certification ECU displays YES within 10 seconds after starting the engine (If it displays NO, see "No steering unlock command" in this table) | Refer to DATA LIST / ACTIVE TEST | |
| 4. Check the output from the IGE terminal of the steering lock ECU | Refer to Steering Lock Motor Drive Power Circuit | |
| 5. Steering lock ECU power source circuit | Refer to Power Source Circuit | |
| 6. Replace the steering lock ECU | Refer to DISASSEMBLY | |
| Steering wheel cannot be unlocked (no steering unlock command). | 1. Check that the "S Code Check" item in the Data List of the certification ECU displays OK (If it displays NG, replace the certification ECU or ID code box) | |
| 2. Check that the "L Code Check" item in the Data List of the certification ECU displays OK (If it displays NG, replace the steering lock ECU, or ID code box) | ||
| 3. Replace the certification ECU | ||
| Steering wheel cannot be locked. | 1. Check for DTCs in the smart access system with push-button start | Refer to DIAGNOSTIC TROUBLE CODE CHART |
| 2. Check for DTCs in the engine immobiliser system | Refer to DIAGNOSTIC TROUBLE CODE CHART | |
| 3. With the power switch OFF and the shift in the P position, open and close the driver door. After that, check that the "Lock/Unlock Receive" item in the Data List of the certification ECU displays YES within 10 seconds (If it displays NO, see "No steering lock command" in this table) | Refer to DATA LIST / ACTIVE TEST | |
| 4. Check the output from the IGE terminal of the steering lock ECU | Refer to Steering Lock Motor Drive Power Circuit | |
| 5. Steering lock ECU power source circuit | Refer to Power Source Circuit | |
| 6. Replace the steering lock ECU | Refer to REMOVAL | |
| Steering wheel cannot be locked (no steering lock command). | 1. Courtesy light switch circuit | |
| 2. Check that the "S Code Check" item in the Data List of the certification ECU displays OK (If it displays NG, replace the certification ECU or ID code box) | ||
| 3. Check that the "L Code Check" item in the Data List of the certification ECU displays OK (If it displays NG, replace the steering lock ECU or ID code box) | ||
| 4. Replace the certification ECU |
STEERING LOCK FUNCTION
| Symptom | Suspected Area | See |
|---|---|---|
| Engine does not start. | 1. Check for DTCs in the smart access system with push-button start | Refer to DIAGNOSTIC TROUBLE CODE CHART |
| 2. Check for DTCs in the engine immobiliser system | Refer to DIAGNOSTIC TROUBLE CODE CHART | |
| 3. Check that the power switch is turned ON (IG) | ||
| 4. Check cranking operation (If cranking operation is possible, see "Engine does not start due to the engine immobiliser" in this table) | ||
| 5. Check "Shift P Sig" in the Data List of the power source control ECU and confirm that the shift signal is normal | ||
| 6. Check whether the steering wheel is locked or unlocked (If it is locked, see "Steering wheel cannot be unlocked" in the steering lock function table) | ||
| 7. Check the output from the SLP terminal of the steering lock ECU | Refer to Unlock Position Sensor Signal Circuit | |
| 8. Check the output signal from the STSW terminal of the power source control ECU (DTC B2275) | Refer to DESCRIPTION | |
| 9. Replace the power source control ECU | ||
| Engine does not start due to the engine immobiliser. | 1. Check that the "L Code Check" item in the Data List of the certification ECU displays OK (If it displays NG, replace the steering lock ECU or ID code box) | |
| 2. Check that the "Engine Start Request" item in the Data List of the certification ECU displays YES (If it displays NO, replace the certification ECU) | ||
| 3. Check that the "S Code Check" item in the Data List of the certification ECU displays OK (If it displays NG, replace the certification ECU or ID code box) | ||
| 4. Replace the ID code box |
PUSH BUTTON START FUNCTION
Scheme 6
- CHECK STEERING LOCK ACTUATOR (STEERING LOCK ECU) Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition GND (K28-1) - Body ground W-B - Body ground Ground Always Below 1 V SGND (K28-2) - Body ground W-B - Body ground Signal ground Always Below 1 V IGE (K28-3) - GND (K28-1) LG - W-B Power source for motor drive Motor is in operation Below 1 V Motor is not in operation 10 to 12 V SLP1 (K28-4) - SGND (K28-2) V - W-B Unlock position sensor output signal When steering is locked 10 to 14 V When steering lock is released Below 1 V LIN (K28-5) - SGND (K28-2) W - W-B LIN communication bus Power switch ON (IG) Pulse generation IG2 (K28-6) - GND (K28-1) B - W-B IG signal input Power switch ON (IG) 10 to 14 V B (K28-7) - GND (K28-1) L - W-B Power source Always 10 to 14 V
Scheme 7
Scheme 8
- DESCRIPTION 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's steering lock ECU. The steering lock ECU records DTCs when the ECU detects a malfunction in the ECU itself or in its circuits. To check the DTCs, connect the Techstream to the DLC3 on the vehicle. The Techstream enables clearing the DTCs, activating indicators and checking the data list. 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 the BEAN.
- CHECK DLC3 The certification ECU follows the ISO 9141-2 as its communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 9141-2 format. Symbols (Terminal 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 ohms SG (5) - Body ground Signal ground Always Below 1 ohms BAT (16) - Body ground Battery positive Always 11 to 14 V If the result is not as specified, the DLC3 may have a malfunction. Repair or replace the harness and connector. HINT: Connect the cable of the Techstream to the DLC3, turn the power switch ON (IG) and attempt to use the Techstream. If the display indicates that a communication error has occurred, there is a problem either with the vehicle or with the Techstream. If communication is normal when the Techstream is connected to another vehicle, inspect the DLC3 of the original vehicle. If communication is still not possible when the Techstream is connected to another vehicle, the problem may be in the Techstream itself. Consult the Service Department listed in the Techstream's instruction manual.
- WARNING FUNCTION OF POWER SWITCH INDICATOR The steering lock ECU blinks the LED indicator of the power 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 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 power switch while turning the steering wheel left and right. Malfunction in smart access system with push-button Blinks amber at 2-second intervals Goes off 15 seconds after the power 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»(ref-387109-S18670913522011022400000) .
- 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 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 power switch while turning the steering wheel left and right. Malfunction in smart access system with push-button "Check S/T Lock" Goes off 15 seconds after the power 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»(ref-387109-S18670913522011022400000) .
DTC CHECK / CLEAR
- CHECK FOR DTCS Turn the power switch off. Connect the Techstream to the DLC3. Turn the power switch ON (IG). Turn the Techstream on. Check the DTCs. Enter the following menus: Body / Smart Access / Trouble Codes. Confirm the details of the DTCs. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(ref-387109-S09337189172011022400000) .
- CLEAR DTCS Turn the power switch off. Connect the Techstream to the DLC3. Turn the power switch ON (IG). Turn the Techstream on. Clear the DTCs. Enter the following menus: Body / 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
- 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 power switch OFF. Connect the Techstream to the DLC3. Turn the power switch ON (IG). Turn the Techstream on. Enter the following menus: Body / 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 - Steering Lock Steering lock condition / Set or Unset Set: Steering lock is set Unset: Steering lock is not set - Steering Unlock Steering unlock condition / Set or Unset Set: Steering unlock is set Unset: Steering unlock is not set - 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/ON 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
- ACTIVE TEST HINT: Using the Techstream to perform Active Tests allows relays, VSVs, actuators and other items to be operated without removing any parts. This non-intrusive functional inspection can be very useful because intermittent operation may be discovered before parts of wiring is disturbed. Performing Active Tests early in troubleshooting is one way to save diagnostic time. Data List information can be displayed while performing Active Tests. Connect the Techstream to the DLC3. Turn the power switch ON (IG). Turn the Techstream on. Perform the Active Test. Enter the following menus: Body / Main Body / Active Test. MAIN BODY Tester Display Test Part Control Range Diagnostic Note Security Indicator Security indicator Indicator ON or OFF
DIAGNOSTIC TROUBLE CODE CHART
HINT
- If a trouble code is displayed during the DTC check, inspect the trouble areas listed for that code. For details of the code, refer to the "See" below.
- The steering lock ECU does not store DTCs regarding the past problems.
| DTC No. | Detection Item | Trouble Area | See |
|---|---|---|---|
| B2781 | Open / Short in Steering Lock ECU | 1. Steering lock actuator (Steering lock ECU) | Refer to DTC B2781: Open / Short in Steering Lock ECU |
| B2782 | Power Source Control ECU Malfunction | 1. Wire harness 2. Steering lock actuator (Steering lock ECU) 3. Power source control ECU | Refer to DTC B2782: Power Source Control ECU Malfunction |
| B2788 | IG2 Signal Malfunction | 1. IG2 relay 2. Wire harness 3. Power source control ECU 4. Steering lock actuator (Steering lock ECU) | Refer to DTC B2788: IG2 Signal Malfunction |
STEERING LOCK SYSTEM