Unable to Unlock Steering Wheel (Hybrid Control System cannot Start)
STEERING COLUMN: STEERING LOCK SYSTEM: Unable to Unlock Steering Wheel (Hybrid Control System cannot Start)
- Unable to Unlock Steering Wheel (Hybrid Control System cannot Start)
DESCRIPTION
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) 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
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
* 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 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 Steering Lock System.
* 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) or certification ECU (smart key ECU assembly), registration must be performed Engine Immobilizer System.
* When disconnecting the cable from the negative (-) auxiliary battery terminal, some systems need to be initialized after the cable is reconnected Repair Instruction - 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.
PROCEDURE
1. CHECK DTC (ALL) Unable to Lock Steering Wheel
NG -- REPAIR CIRCUITS INDICATED BY OUTPUT DTCS
OK -- Continue to next step.
2. CHECK POWER SWITCH (SWITCH CONDITION)
(a) Check the power source mode change.
(1) 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 -- GO TO SMART KEY SYSTEM (for Start Function) (PROBLEM SYMPTOMS TABLE) Problem Symptoms Table
OK -- Continue to next step.
3. READ VALUE USING TECHSTREAM (UNLOCK REQUEST RECEIVE)
(a) Use the Data List to check if the steering lock request is functioning properly.
Smart Key
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 -- READ VALUE USING TECHSTREAM (L CODE CHECK)
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)
(a) Disconnect the I24 steering lock ECU connector.
(b) Measure the resistance and voltage according to the value(s) in the table below.
Standard Resistance:
NOTICE:
If the result is not as specified, check for looseness in the connection which leads to ground.
Standard Voltage:
Text in Illustration
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
5. INSPECT STEERING LOCK ECU (MOTOR ACTIVATION COMMAND SIGNAL)
(a) Reconnect the I24 steering lock ECU connector.
(b) Check the signal waveform according to the condition(s) in the table below.
Standard Frequency
Text in Illustration
HINT
* When taking measurements when 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 -- REPLACE STEERING LOCK ACTUATOR ASSEMBLY Disassembly
6. READ VALUE USING TECHSTREAM (L CODE CHECK) Unable to Lock Steering Wheel
NG -- REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
OK -- Continue to next step.
7. REPLACE STEERING LOCK ACTUATOR ASSEMBLY Unable to Lock Steering Wheel
NG -- REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Removal
OK -- END
8. REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Unable to Lock Steering Wheel
NG -- REPLACE STEERING LOCK ACTUATOR ASSEMBLY Disassembly
OK -- END