Steering Lock System (diagnostic Codes & Symptom Tests) Toyota Prius C I

DESCRIPTION

The steering lock ECU and steering lock motor are built into the steering lock actuator assembly.

The steering lock ECU detects whether the steering lock is in the lock or unlock position by using the lock position sensor of the steering lock motor.

The steering lock ECU receives lock and unlock request signals from the certification ECU (smart key ECU assembly) and responds with lock and unlock operation signals.

HINT

The steering lock ECU is not connected to the CAN communication system. However, the steering lock ECU is connected to the certification ECU (smart key ECU assembly) via LIN communication and communicates with other components via CAN communication through the certification ECU (smart key ECU assembly).

1. *1: Only output while a malfunction is present and the power switch is on (IG).
2. *2: When both detection switches turn on, the system is determined to be malfunctioning.

Scheme 66

VEHICLE CONDITION AND FAIL-SAFE FUNCTION WHEN MALFUNCTION DETECTED

RELATED DATA LIST AND ACTIVE TEST ITEMS

INSPECTION PROCEDURE

Note. When using the Techstream with the power switch off, perform either of the following: 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, select the vehicle type under manual mode, and then enter the following menus: Body Electrical / Smart Key / Trouble Codes. After performing repairs, confirm that no DTCs are output again. Refer to DTC CHECK / CLEAR . When replacing the steering lock ECU (steering lock actuator assembly), registration must be performed. Refer to REGISTRATION .

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.

PROCEDURE

1. CHECK DTC Using the Techstream, check if LIN communication DTC B2785 is output. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/communication-devices/#lin-communication-system-diagnostics-introduction__dtc-check-clear) . HINT: If a LIN communication DTC is output, perform troubleshooting for the LIN communication system. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(/toyota/prius-c/i-2011-2015/remont/communication-devices/#lin-communication-system-diagnostics-introduction__how-to-proceed-with-troubleshooting) . Result Result Proceed to DTC B2785 is output. A DTC B2785 is not output. B B --> See step 3 A --> See step 2
2. GO TO LIN COMMUNICATION SYSTEM (DTC B2785). Refer to «DTC B2785: Communication Malfunction between ECUs Connected by LIN»(/toyota/prius-c/i-2011-2015/remont/communication-devices/#lin-communication-system-diagnostic-codes-b126a-b278c)
3. REPLACE STEERING LOCK ACTUATOR ASSEMBLY. Refer to «DISASSEMBLY»(/toyota/prius-c/i-2011-2015/remont/steering-column/#steering-column-service-information)

The power management control ECU has a power source mode switching function.

This DTC is stored when the IGE input (the steering lock motor activation permission signal) sent directly from the power management control ECU to the steering lock ECU is determined to be abnormal.

HINT

The steering lock ECU is not connected to the CAN communication system. However, the steering lock ECU is connected to the certification ECU (smart key ECU assembly) via LIN communication and communicates with other components via CAN communication through the certification ECU (smart key ECU assembly).

1. *: Only output while a malfunction is present and the power switch is on (IG).

VEHICLE CONDITION AND FAIL-SAFE FUNCTION WHEN MALFUNCTION DETECTED

RELATED DATA LIST AND ACTIVE TEST ITEMS

Scheme 67

Note. When using the Techstream with the power switch off, perform either of the following: 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, select the vehicle type under manual mode, and then enter the following menus: Body Electrical / Smart Key / Trouble Codes. 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 . When disconnecting the cable from the negative (-) auxiliary battery terminal, some systems need to be initialized after the cable is reconnected. Refer to INITIALIZATION . After performing repairs, perform the DTC output confirmation operation, and then confirm that no DTCs are output again. Refer to DTC CHECK / CLEAR . When replacing the steering lock ECU (steering lock actuator assembly), registration must be performed. Refer to REGISTRATION .

Scheme 68

Scheme 69

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 G50 steering lock ECU connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition G50-1 (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 G50 steering lock ECU connector. Turn the power switch off, make sure that the steering is unlocked and move the shift lever to P. Check the signal waveform according to the condition(s) in the table below. STANDARD FREQUENCY Item Content Tester Connection G50-3 (IGE) - G50-1 (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 power switch on (ACC) or on (IG) with the shift lever in P. To lock the steering, turn the power 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»(/toyota/prius-c/i-2011-2015/remont/steering-column/#steering-lock-system-diagnostics-introduction__dtc-check-clear) . Disconnect the cable from the negative (-) auxiliary battery terminal, wait for 30 seconds or more, and then reconnect the cable to the negative (-) auxiliary battery terminal to clear the record of malfunctions stored in the Data List. WARNING: After turning the power switch off, waiting time may be required before disconnecting the cable from the auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the auxiliary battery terminal notices before proceeding with work. Refer to «PRECAUTION»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) . 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»(/toyota/prius-c/i-2011-2015/remont/steering-column/#steering-lock-system-diagnostics-introduction__dtc-check-clear) . Use the Data List to check if the steering lock control is functioning properly. SMART KEY 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 power management control ECU (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 power management control ECU 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 - POWER MANAGEMENT CONTROL ECU) Make sure that there is no looseness at the locking part and the connecting part of the connectors. Disconnect the G50 steering lock ECU connector. Disconnect the G58 power management control ECU 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 G50-3 (IGE) - G58-6 (SLR+) Always Below 1 ohms G50-3 (IGE) - Body ground Always 10 kohms or higher G58-6 (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»(/toyota/prius-c/i-2011-2015/remont/steering-column/#steering-column-service-information)
6. REPLACE POWER MANAGEMENT CONTROL ECU. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/body-electrical/#power-distribution-service-information)

This DTC is stored when the steering lock ECU detects an IG2 power supply malfunction.

HINT

The steering lock ECU is not connected to the CAN communication system. However, the steering lock ECU is connected to the certification ECU (smart key ECU assembly) via LIN communication and communicates with other components via CAN communication through the certification ECU (smart key ECU assembly).

1. *: Only output while a malfunction is present and the power switch is on (IG).

VEHICLE CONDITION AND FAIL-SAFE FUNCTION WHEN MALFUNCTION DETECTED

RELATED DATA LIST AND ACTIVE TEST ITEMS

Scheme 70

Note. When using the Techstream with the power switch off, perform either of the following: 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, select the vehicle type under manual mode, and then enter the following menus: Body Electrical / Smart Key / Trouble Codes. 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 . 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 . When replacing the steering lock ECU (steering lock actuator assembly), registration must be performed. Refer to REGISTRATION .

Scheme 71

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 G50 steering lock ECU connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition G50-1 (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 G50 steering lock ECU connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition G50-6 (IG2) - G50-1 (GND) Power switch on (IG) 11 to 14 V G50-6 (IG2) - G50-1 (GND) Power 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»(/toyota/prius-c/i-2011-2015/remont/steering-column/#steering-column-service-information)

The steering lock actuator assembly activates the steering lock motor and moves the lock bar into the steering column to lock the steering.

The steering may not unlock when the lock bar gets stuck in the lock hole of the steering column. In this case, if an hybrid control system operation is performed while shaking the steering wheel in the same manner as is done for a vehicle with a mechanical key, the lock bar will be unlocked. If the certification ECU (smart key ECU assembly), ID code box (immobiliser code ECU) or power management control ECU is replaced, the system needs to be initialized. Otherwise, the steering cannot be unlocked and the hybrid control system cannot be started.

RELATED DATA LIST AND ACTIVE TEST ITEMS

Scheme 72

Note. When using the Techstream with the power switch off, perform either of the following: 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, select the vehicle type under manual mode, and then enter the following menus: Body Electrical / Smart Key / Trouble Codes. Perform either of the following operations to lock/unlock the steering: To unlock the steering, carry the key and turn the power switch on (ACC) or on (IG) with the shift lever in P. To lock the steering, turn the power 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 . After performing repairs, confirm that the problem does not occur. 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 . 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 (immobiliser code ECU), registration must be performed. Refer to REGISTRATION . When disconnecting the cable from the negative (-) auxiliary battery terminal, some systems need to be initialized after the cable is reconnected. Refer to INITIALIZATION . If the steering lock ECU (steering lock actuator assembly) or certification ECU (smart key ECU 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 hybrid control system. If the steering is locked for any reason, open and close a door with the power switch off, and then unlock the steering by pressing the power switch. This prevents the hybrid control system from starting while the steering is locked.

Scheme 73

Scheme 74

1. CHECK DTC (ALL) See step 1 NG --> REPAIR CIRCUITS INDICATED BY OUTPUT DTCS OK: Go to next step
2. CHECK POWER 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 power 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 KEY 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 (immobiliser code ECU) / OK or NG HINT: The reception state is maintained for 10 seconds. When 10 seconds or more elapse after receiving the signal, the item changes to "NG". OK: Within 10 seconds of turning power switch on (IG) or on (ACC) or starting hybrid control system NG: Except above If the unlock signal has not been received, the hybrid control system 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 power switch on (ACC) or on (IG) or starting the hybrid control system, 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 G50 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 G50-1 (GND) - Body ground Always Below 1 ohms NOTE: If the result is not as specified, check for looseness in the connection which leads to ground. Standard Voltage Tester Connection Condition Specified Condition G50-7 (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 G50 steering lock ECU connector. Check the signal waveform according to the condition(s) in the table below. STANDARD FREQUENCY Item Content Tester Connection G50-3 (IGE) - G50-1 (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 power switch on (ACC) or on (IG) with the shift lever in P. To lock the steering, turn the power 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 ID CODE BOX (IMMOBILISER CODE ECU) See step 9 NG --> See step 12 OK --> END
10. REPLACE ID CODE BOX (IMMOBILISER CODE ECU) See step 10 NG --> See step 11 OK --> END
11. REPLACE STEERING LOCK ACTUATOR ASSEMBLY. Refer to «DISASSEMBLY»(/toyota/prius-c/i-2011-2015/remont/steering-column/#steering-column-service-information)
12. REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/door-locks-anti-theft-systems/#theft-deterrent-system-keyless-entry-system-service-information)
13. GO TO SMART KEY SYSTEM (for Start Function) (PROBLEM SYMPTOMS TABLE). Refer to «PROBLEM SYMPTOMS TABLE»(/toyota/prius-c/i-2011-2015/remont/starter/#smart-key-system-for-start-function-diagnostics-introduction__problem-symptoms-table)

The steering lock actuator activates the steering lock motor and moves the lock bar into the steering column to lock the steering.

When the steering lock is operating, the steering may not lock when the lock bar is not aligned with the lock hole of the steering column. In this case, the steering can be locked by turning the steering wheel a little in the same manner as is done for a vehicle with a mechanical key to change the position of the lock hole.

RELATED DATA LIST AND ACTIVE TEST ITEMS

Note. When using the Techstream with the power switch off, perform either of the following: 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, select the vehicle type under manual mode, and then enter the following menus: Body Electrical / Smart Key / Trouble Codes. Perform either of the following operations to lock/unlock the steering: To unlock the steering, carry the key and turn the power switch on (ACC) or on (IG) with the shift lever in P. To lock the steering, turn the power 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 . 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 . When replacing the steering lock ECU (steering lock actuator assembly), certification ECU (smart key ECU assembly) or ID code box (immobiliser code ECU), registration must be performed. Refer to REGISTRATION . After performing repairs, confirm that the problem does not occur. Inspect the fuses for circuits related to this system before performing the following inspection procedure. When disconnecting the cable from the negative (-) auxiliary battery terminal, some systems need to be initialized after the cable is reconnected. Refer to INITIALIZATION .

1. CHECK DTC (ALL) Using the Techstream, confirm the output of DTCs for all systems. OK No DTCs are output. NOTE: When using the Techstream with the power switch off, perform either of the following: 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, select the vehicle type under manual mode, and then enter the following menus: Body Electrical / Smart Key / Trouble Codes. Make sure that no DTCs are output. If any DTCs are output, proceed to Diagnostic Trouble Code Chart. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-c/i-2011-2015/remont/steering-column/#steering-lock-system-diagnostics-introduction__diagnostic-trouble-code-chart) . NG --> REPAIR CIRCUITS INDICATED BY OUTPUT DTCS OK: Go to next step
2. READ VALUE USING TECHSTREAM (LOCK REQUEST RECEIVE) Use the Data List to check if the steering lock command is functioning properly. SMART KEY Tester Display Measurement Item/Range Normal Condition Diagnostic Note Lock Request Receive Reception state of steering lock request signal by certification ECU (smart key ECU assembly) and sent to ID code box (immobiliser code ECU) / OK or NG HINT: The reception state is maintained for 10 seconds. When 10 seconds or more elapse after receiving the signal, the item changes to "NG". OK: Within 10 seconds of opening any door with power 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. OK The certification ECU (smart key ECU assembly) receives a lock request signal within 10 seconds of turning the power switch from on (IG) to off and opening a door with the shift lever in P, and OK is displayed on the Techstream screen. NG --> See step 5 OK: Go to next step
3. INSPECT STEERING LOCK ECU (MOTOR ACTIVATION COMMAND SIGNAL) See step 1 NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - POWER MANAGEMENT CONTROL ECU) See step 4 NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 12
5. READ VALUE USING TECHSTREAM (DOOR COURTESY SW) Using the Techstream, check the following main body ECU Data List item by opening and closing the driver door to confirm the state of the front door courtesy light switch assembly. 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 closed OFF: Front door LH open 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 a related part. OK The Data List item changes in accordance with the opening and closing of the driver door. NG --> See step 11 OK: Go to next step
6. READ VALUE USING TECHSTREAM (S CODE CHECK) Use the Data List to check if S code certification is functioning properly. SMART KEY Tester Display Measurement Item/Range Normal Condition Diagnostic Note S Code Check Verification result between certification ECU (smart key ECU assembly) and ID code box (immobiliser 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 (immobiliser code ECU) is not registered or the certification ECU (smart key ECU assembly) or ID code box (immobiliser code ECU) is malfunctioning. The steering cannot be locked. The steering cannot be unlocked (the hybrid control system cannot be started). OK OK is displayed on the Techstream. HINT: Reasons for verification failure: The certification ECU (smart key ECU assembly) or ID code box (immobiliser code ECU) is malfunctioning. There is a problem with the communication between ECUs. An ECU is replaced, but is not registered. An ECU is replaced with an ECU which has a code already stored in it. NG --> See step 9 OK: Go to next step
7. READ VALUE USING TECHSTREAM (L CODE CHECK) Use the Data List to check if L code certification is functioning properly. SMART KEY Tester Display Measurement Item/Range Normal Condition Diagnostic Note L Code Check Verification result between ID code box (immobiliser 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 (immobiliser code ECU) or steering lock ECU is not registered or the ID code box (immobiliser code ECU) or steering lock ECU is malfunctioning. The steering cannot be locked. The steering cannot be unlocked (the hybrid control system cannot be started). OK OK is displayed on the Techstream. HINT: Reasons for verification failure: The steering lock ECU or ID code box (immobiliser code ECU) is malfunctioning. There is a problem with the communication between ECUs. An ECU is replaced, but is not registered. An ECU is replaced with an ECU which has a code already stored in it. NG --> See step 10 OK: Go to next step
8. REPLACE STEERING LOCK ACTUATOR ASSEMBLY Replace the steering lock ECU (steering lock actuator assembly) with a new one. Refer to «DISASSEMBLY»(/toyota/prius-c/i-2011-2015/remont/steering-column/#steering-column-service-information) . Perform the registration procedures. Refer to «REGISTRATION»(/toyota/prius-c/i-2011-2015/remont/door-locks-anti-theft-systems/#engine-immobiliser-with-smart-key-system-diagnostics-introduction) . Turn the power switch on (IG). Turn the steering wheel and check the steering condition. OK Steering is unlocked. NG --> See step 13 OK --> END
9. REPLACE ID CODE BOX (IMMOBILISER CODE ECU) Replace the ID code box (immobiliser code ECU) with a new one. Perform the registration procedures. Refer to «REGISTRATION»(/toyota/prius-c/i-2011-2015/remont/door-locks-anti-theft-systems/#engine-immobiliser-with-smart-key-system-diagnostics-introduction) . Use the Data List to check if S code certification is functioning properly again. SMART KEY Tester Display Measurement Item/Range Normal Condition Diagnostic Note S Code Check Verification result between certification ECU (smart key ECU assembly) and ID code box (immobiliser 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 (immobiliser code ECU) is not registered or the certification ECU (smart key ECU assembly) or ID code box (immobiliser code ECU) is malfunctioning. The steering cannot be locked. The steering cannot be unlocked (the hybrid control system cannot be started). OK OK is displayed on the Techstream. NG --> See step 13 OK --> END
10. REPLACE ID CODE BOX (IMMOBILISER CODE ECU) Replace the ID code box (immobiliser code ECU) with a new one. Perform the registration procedures. Refer to «REGISTRATION»(/toyota/prius-c/i-2011-2015/remont/door-locks-anti-theft-systems/#engine-immobiliser-with-smart-key-system-diagnostics-introduction) . Use the Data List to check if L code certification is functioning properly again. SMART KEY Tester Display Measurement Item/Range Normal Condition Diagnostic Note L Code Check Verification result between ID code box (immobiliser 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 (immobiliser code ECU) or steering lock ECU is not registered or the ID code box (immobiliser code ECU) or steering lock ECU is malfunctioning. The steering cannot be locked. The steering cannot be unlocked (the hybrid control system cannot be started). OK OK is displayed on the Techstream. NG --> See step 12 OK --> END
11. GO TO LIGHTING SYSTEM (FRONT DOOR COURTESY SWITCH CIRCUIT). Refer to «Front Door Courtesy Switch Circuit»(/toyota/prius-c/i-2011-2015/remont/interiorillumination-lights/#lighting-system-interior-diagnostics-circuit-tests)
12. REPLACE STEERING LOCK ACTUATOR ASSEMBLY. Refer to «DISASSEMBLY»(/toyota/prius-c/i-2011-2015/remont/steering-column/#steering-column-service-information)
13. REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/door-locks-anti-theft-systems/#theft-deterrent-system-keyless-entry-system-service-information)

See also:
• DTC CHECK / CLEAR
• REGISTRATION
• DTC CHECK / CLEAR
• HOW TO PROCEED WITH TROUBLESHOOTING
• DTC B2785: Communication Malfunction between ECUs Connected by LIN
• DISASSEMBLY
• INITIALIZATION
• PRECAUTION
• REMOVAL
• DATA LIST / ACTIVE TEST
• DIAGNOSTIC TROUBLE CODE CHART
• REMOVAL
• PROBLEM SYMPTOMS TABLE
• Front Door Courtesy Switch Circuit