Steering Lock System - Steering Lock Motor Drive Power Circuit
DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK VEHICLE CONDITION
READ VALUE USING INTELLIGENT TESTER (LOCK/UNLOCK RECEIVE)
INSPECT STEERING LOCK ECU
CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - MAIN BODY ECU)
INSPECT STEERING LOCK ECU
CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - MAIN BODY ECU)
STEERING LOCK SYSTEM - Steering Lock Motor Drive Power Circuit
DESCRIPTION
The main body ECU supplies the power to activate the motor of the steering lock actuator assembly.
The diagnosis information of the steering lock ECU is transmitted to the intelligent tester via the certification ECU (smart key ECU assembly) as the steering lock ECU is not connected to the CAN communication system.
WIRING DIAGRAM
INSPECTION PROCEDURE
- When the engine switch is off, the main body ECU may occasionally go into a non-active state called sleep mode. Therefore, before proceeding with the inspection, it is necessary to perform the following steps to wake up the ECU:
- With the engine switch off, open the driver door. Then (with the engine switch still off) open and close any door several times at 1.5 second intervals.
- If the steering lock actuator assembly (steering lock ECU) is replaced, with the engine switch off and the shift lever in P (for A/T), open and close the driver side door to record the current lock position into the steering lock ECU. If this is not performed, the engine may not start.
| 1.CHECK VEHICLE CONDITION |
Check the problem symptom of the steering lock system.
Result| Result | Proceed to |
| Steering lock cannot be released | A |
| Steering lock cannot lock | B |
| 2.READ VALUE USING INTELLIGENT TESTER (LOCK/UNLOCK RECEIVE) |
Use the Data List to check if the steering lock command is functioning properly.
Entry&Start| Tester Display | Measurement Item/Range | Normal Condition | Diagnostic Note |
| Lock/Unlock Receive | Steering lock command reception record/YES or NO | YES: Steering lock/unlock signal received
NO: Steering lock/unlock signal not received | - |
- OK:
- YES is displayed on the intelligent tester screen.
| | GO TO ENTRY AND START SYSTEM (FOR START FUNCTION) (HOW TO PROCEED WITH TROUBLESHOOTING) ()
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| 3.INSPECT STEERING LOCK ECU |
Immediately after turning the engine switch on (IG), measure the voltage between terminals E26-3 (IGE) and E26-1 (GND) of the steering lock ECU.
Result| Result | Proceed to |
| 11 to 14 V (measured voltage never becomes below 1 V) | A |
| Below 1 V | B |
| | GO TO ENTRY AND START SYSTEM (FOR START FUNCTION) (PROBLEM SYMPTOMS TABLE) ()
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| 4.CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - MAIN BODY ECU) |
Disconnect the E26 steering lock ECU connector.
Disconnect the E1 main body ECU connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| E26-3 (IGE) - E1-19 (SLR+) | Always | Below 1 Ω |
| E26-3 (IGE) or E1-19 (SLR+) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 5.INSPECT STEERING LOCK ECU |
Move the shift lever to P (for A/T).
Turn the engine switch off.
Open the driver side door.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Condition | Specified Condition |
| E26-3 (IGE) - E26-1 (GND) | Steering lock motor operating | Below 1 V |
| E26-3 (IGE) - E26-1 (GND) | Steering lock motor not operating | 11 to 14 V |
| OK | |
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| GO TO ENTRY AND START SYSTEM (FOR START FUNCTION) (PROBLEM SYMPTOMS TABLE) ()
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| 6.CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - MAIN BODY ECU) |
Disconnect the E26 steering lock ECU connector.
Disconnect the E1 main body ECU connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| E26-3 (IGE) - E1-19 (SLR+) | Always | Below 1 Ω |
| E26-3 (IGE) or E1-19 (SLR+) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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