HOW TO PROCEED WITH TROUBLESHOOTING
*: Use Techstream.
- VEHICLE BROUGHT TO WORKSHOP NEXT: Go to next step
- CHECK AND CLEAR DTCS* NEXT: Go to next step
- PROBLEM SYMPTOM CONFIRMATION --> SYMPTOM DOES NOT OCCUR (Go to 4 step 4) --> SYMPTOM OCCURS (Go to 5 step 5)
- SYMPTOM SIMULATION NEXT: Go to next step
- CHECK CAN COMMUNICATION SYSTEM* HINT: Check that there are no problems with the CAN communication system before troubleshooting the steering lock system. NEXT: Go to next step
- DTC CHECK* --> DTC IS NOT OUTPUT (Go to 7 step 7) --> DTC IS OUTPUT (Go to step 8 8)
- PROBLEM SYMPTOMS TABLE --> Go to 9 step 9
- 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
Inspect the suspected areas in numerical order by referring to the corresponding articles when any of the following symptoms occurs
| Symptom | Suspected Area | See |
|---|---|---|
| Steering wheel cannot be unlocked (the engine cannot be started). | 1. Initialization | Refer to INITIALIZATION |
| 2. Check for DTCs in the smart access system with push-button start. | Refer to DTC CHECK / CLEAR | |
| 3. Check for DTCs in the engine immobilizer system. | Refer to DTC CHECK / CLEAR | |
| 4. 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 1 "No steering unlock command" in this table.) | Refer to DATA LIST / ACTIVE TEST | |
| 5. Check the input signal from the IGE terminal of the steering lock ECU. | Refer to Steering Lock Motor Drive Power Circuit | |
| 6. Steering lock ECU power source circuit. | Refer to Power Source Circuit | |
| 7. 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 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 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 DTC CHECK / CLEAR |
| 2. Check for DTCs in the engine immobilizer system. | Refer to DTC CHECK / CLEAR | |
| 3. With the engine switch off and the shift lever in the P position, open and close the drivers 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 1 "No steering lock command" in this table.) | Refer to DATA LIST / ACTIVE TEST | |
| 4. Check the input signal 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 locked (no steering lock command). | 1. Courtesy light switch circuit | Refer to Door Courtesy 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 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 ID code box.) | ||
| 4. Replace the certification ECU. |
ELECTRIC STEERING LOCK FUNCTION
| Symptom | Suspected Area | See |
|---|---|---|
| Engine does not start. | 1. Initialization | Refer to INITIALIZATION |
| 2. Check for DTCs in the smart access system with push-button start. | Refer to DTC CHECK / CLEAR | |
| 3. Check for DTCs in the engine immobilizer system. | Refer to DTC CHECK / CLEAR | |
| 4. Check that the engine switch is turned on (IG). | ||
| 5. Check cranking operation. (If cranking operation is possible, see 1 "Engine does not start due to the engine immobilizer" in this table.) | ||
| 6. Check Shift P Signal in the DATA LIST of the main body ECU and confirm that the shift signal is normal. | ||
| 7. Check whether the steering wheel is locked or unlocked. (If it is locked, see 1 "Steering wheel cannot be unlocked" in the steering lock function table.) | ||
| 8. Check the output from the SLP terminal of the steering lock ECU. | Refer to Unlock Position Sensor Signal Circuit | |
| 9. Check the output signal from the ST SW of the certification ECU (DTC B2275). | Refer to DTC B2275: STSW Monitor Malfunction | |
| 10. Replace the main body ECU. | ||
| Engine does not start due to the engine immobilizer. | 1. Check that the L Code Check item in the DATA LIST of the certification ECU displays OK. (If it displays NG, replace the 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 ID code box.) | ||
| 4. Replace the ID code box. |
SMART ACCESS SYSTEM WITH PUSH-BUTTON START FUNCTION
Scheme 13
- STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition E78-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 V E78-2 (SGND) - Body ground W-B - Body ground Signal ground Always Below 1 V E78-3 (IGE) - E78-1 (GND) BR - W-B Power source for driving motor Motor is in operation Motor is not in operation Below 1 V 10 to 12 V E78-4 (SLP1) - E78-2 (SGND) GR - W-B Unlock position sensor output signal Steering is locked Steering lock is released 10 to 14 V Below 1 V E78-5 (LIN) - E78-2 (SGND) BE - W-B LIN communication bus Engine switch on (IG) Pulse generation E78-6 (IG2) - E78-1 (GND) B - W-B IG signal input Engine switch on (IG) 10 to 14 V E78-7 (B) - E78-1 (GND) B - W-B Power source Always 10 to 14 V
Scheme 14
Scheme 15
- DESCRIPTION DIAGNOSTIC SYSTEM When troubleshooting a vehicle with a diagnostic system, the only difference from the usual troubleshooting procedure is connecting Techstream 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 system circuits. To check the DTCs, connect Techstream to the DLC3 on the vehicle. Techstream enables the DTCs to be cleared, the indicators to be activated, and the DATA LIST to be checked. The steering lock ECU diagnosis information cannot be read directly from the steering lock ECU by the tester. The diagnosis information from the steering lock ECU is transmitted to the tester via the certification ECU to the tester using the controller area network (CAN).
- CHECK DLC3 The certification ECU uses ISO 15765-4 for communication. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format. Symbols (Terminal No.) Terminal Description Condition Specified Condition SIL (7) - SG (5) Bus "+" line During transmission 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 CANH (6) - CANL (14) CAN bus line Engine Switch off* 54 to 69 ohms CANH (6) - CG (4) HIGH-level CAN bus line Engine Switch off* 200 ohms or higher CANL (14) - CG (4) LOW-level CAN bus line Engine Switch off* 200 ohms or higher CANH (6) - BAT (16) HIGH-level CAN bus line Engine Switch off* 6 kohms or higher CANL (14) - BAT (16) LOW-level CAN bus line Engine Switch off* 6 kohms or higher NOTE: *: Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the engine switch, and other switches or the doors. If the result is not as specified, the DLC3 may have a malfunction. Repair or replace the harness and connector. Connect the cable of Techstream to the DLC3, turn the engine switch on (IG) and attempt to use the tester. If the display indicates that a communication error has occurred, there is a problem either with the vehicle or with the tester. If communication is normal when the tester is connected to another vehicle, inspect the DLC3 of the original vehicle. If communication is still not possible when the tester is connected to another vehicle, the problem may be in the tester itself. Consult the Service Department listed in the tester's instruction manual.
- 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 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 smart access system with push-button start 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 main body ECU. Troubleshoot by following "HOW TO PROCEED WITH TROUBLESHOOTING". Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-396676-S29527569482011050900000) .
- 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 engine switch while turning the steering wheel left or right. Malfunction in smart access system with push-button start "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 main body ECU. Troubleshoot by following "HOW TO PROCEED WITH TROUBLESHOOTING". Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-396676-S29527569482011050900000) .
DTC CHECK / CLEAR
- CHECK FOR DTCS Turn the engine switch off. Connect Techstream to the DLC3. Turn the engine switch on (IG). Turn Techstream on. Check for DTCs. Enter the following menus: Body / Smart Access / Trouble Codes. Confirm the details of the DTCs. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(ref-396676-S01189762262011050900000) .
- CLEAR DTCS Turn the engine switch off. Connect Techstream to the DLC3. Turn the engine switch on (IG). Turn Techstream on. Clear the DTCs. Enter the following menus: Body / Smart Access / Trouble Codes. According to the display on Techstream, select the trouble code data display with the clear button.
DATA LIST / ACTIVE TEST
- DATA LIST HINT: Using 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 Techstream to the DLC3. Turn the engine switch on (IG). Turn Techstream on. Enter the following menus: Body / Smart Access / Data List. According to the display on the tester, 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 / ON or OFF ON: 10 to 14 V OFF: Below 1 V - IG (Lin) LIN bus IG status / ON or OFF ON: LIN bus IG ON status OFF: LIN bus IG OFF status
- ACTIVE TEST HINT: Using 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 or 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. Turn the engine switch off. Connect Techstream to the DLC3. Turn the engine switch on (IG). Turn Techstream on. Enter the following menus: Body / Smart Access / Active Test. According to the display on the tester, read the "Active Test". SMART ACCESS: Tester Display Test Part Control Range Diagnostic Note P Supply for SteeringLock Steering Lock Power Source ON / OFF
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 article.
HINT
The steering lock ECU does not store DTCs regarding the past problems.
| DTC Code | Detection Item | Trouble Area | See |
|---|---|---|---|
| B2781 | Open / Short in Steering Lock ECU | Steering lock actuator assembly (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 assembly (Steering lock ECU) 3. Main body ECU | Refer to DTC B2782: Power Source Control ECU Malfunction |
| B2788 | IG2 Signal Malfunction | 1. IG2 relay 2. Wire harness 3. Main body ECU 4. Steering lock actuator assembly (Steering lock ECU) | Refer to DTC B2788: IG2 Signal Malfunction |
STEERING LOCK SYSTEM