Steering Lock System (Diagnostic Codes & Symptom Tests): Other Toyota Prius C I facelift

PROCEDURE

1. CHECK DTC Using the Techstream, check if LIN communication DTC B2785 is output. Refer to «DTC CHECK / CLEAR [12/2013 - ]»(ref-651382-S26694655632014081900000) . HINT: If a LIN communication DTC is output, perform troubleshooting for the LIN communication system. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [12/2013 - ]»(ref-651382-S36827887332014081900000) . 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 [12/2013 - ]»(ref-651385-S00501098132014081900000)
3. REPLACE STEERING LOCK ACTUATOR ASSEMBLY. Refer to «DISASSEMBLY [12/2013 - ]»(ref-651357-S05036633562014081900000)

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 [12/2013 - ]»(ref-651383-S02521068042014081900000) . 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 [12/2013 - ]»(ref-651169-S11524377852014081900000) . 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 [12/2013 - ]»(ref-651383-S02521068042014081900000) . 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 [12/2013 - ]»(ref-651357-S05036633562014081900000)
6. REPLACE POWER MANAGEMENT CONTROL ECU. Refer to «REMOVAL [12/2013 - ]»(ref-651325-S26988047612014081900000)

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 [12/2013 - ]»(ref-651357-S05036633562014081900000)

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 (immobilizer 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 (IMMOBILIZER CODE ECU) See step 9 NG --> See step 12 OK --> END
10. REPLACE ID CODE BOX (IMMOBILIZER CODE ECU) See step 10 NG --> See step 11 OK --> END
11. REPLACE STEERING LOCK ACTUATOR ASSEMBLY. Refer to «DISASSEMBLY [12/2013 - ]»(ref-651357-S05036633562014081900000)
12. REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to «REMOVAL [12/2013 - ]»(ref-651351-S31629825642014081900000)
13. GO TO SMART KEY SYSTEM (for Start Function) (PROBLEM SYMPTOMS TABLE). Refer to «PROBLEM SYMPTOMS TABLE [12/2013 - ]»(ref-651177-S16852267872014081900000)

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 [12/2013 - ]»(ref-651383-S35647363352014081900000) . 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 (immobilizer 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 (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 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 (immobilizer 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 (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 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 (immobilizer 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 [12/2013 - ]»(ref-651357-S05036633562014081900000) . Perform the registration procedures. Refer to «REGISTRATION [12/2013 - ]»(ref-651189-S36817675492014081900000) . 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 (IMMOBILIZER CODE ECU) Replace the ID code box (immobilizer code ECU) with a new one. Perform the registration procedures. Refer to «REGISTRATION [12/2013 - ]»(ref-651189-S36817675492014081900000) . 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 (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 hybrid control system cannot be started). OK OK is displayed on the Techstream. NG --> See step 13 OK --> END
10. REPLACE ID CODE BOX (IMMOBILIZER CODE ECU) Replace the ID code box (immobilizer code ECU) with a new one. Perform the registration procedures. Refer to «REGISTRATION [12/2013 - ]»(ref-651189-S36817675492014081900000) . 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 (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 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 [12/2013 - ]»(ref-651178-S00460776372014081900000)
12. REPLACE STEERING LOCK ACTUATOR ASSEMBLY. Refer to «DISASSEMBLY [12/2013 - ]»(ref-651357-S05036633562014081900000)
13. REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to «REMOVAL [12/2013 - ]»(ref-651351-S31629825642014081900000)