DESCRIPTION
If the steering lock ECU determines that there is a malfunction inside the ECU, it outputs this DTC. The steering lock ECU diagnosis information cannot be read directly from the steering lock ECU by the Techstream. The diagnosis information from the steering lock ECU is transmitted to the Techstream via the certification ECU to the Techstream using the Controller Area Network (CAN).
| DTC No. | DTC Detecting Condition | Trouble Area |
|---|---|---|
| B2781 | Steering lock motor drive circuit is defective. Both lock and unlock position sensors detect "ON". | Steering lock actuator assembly (Steering lock ECU) |
The steering lock ECU activates the steering lock motor by the power from the main body ECU* through the IGE circuit. This prevents the steering from being locked while the vehicle is moving.
The diagnosis information of the steering lock ECU is transmitted to the Techstream via the certification ECU as the steering lock ECU is not connected to the CAN communication system.
HINT
*: The power source control ECU is not a physical part. This code refers to the power source control function performed by the main body ECU.
| DTC No. | DTC Detecting Condition | Trouble Area |
|---|---|---|
| B2782 | Steering lock motor drive control circuit is defective. | Wire harness Steering lock actuator assembly (Steering lock ECU) Main body ECU |
Scheme 78
The steering lock ECU determines the on/off status of the engine switch through the IG2 signal circuit.
After receiving an IG2 relay ON signal, the steering lock ECU determines that the vehicle is moving. The steering lock ECU does not lock the steering when it receives the IG2 relay ON signal. This prevents the steering from being locked while the vehicle is moving.
The diagnosis information of the steering lock ECU is transmitted to the Techstream via the certification ECU as the steering lock ECU is not connected to the CAN communication system.
| DTC No. | DTC Detecting Condition | Trouble Area |
|---|---|---|
| B2788 | Different information is obtained from IG2 signal received directly from the IG2 circuit, and from IG2 signal sent via LIN communication for a period of 1 second. | IG2 relay Wire harness Main body ECU Steering lock actuator assembly (Steering lock ECU) |
Scheme 79
The steering lock ECU is connected to the main body ECU and certification ECU. The steering lock ECU cannot activate the motor unless it receives permission signals from both ECUs. (The main body ECU permits the steering lock ECU to supply power to activate the motor.)
The unlock position sensor is one of the components in the steering lock actuator. The sensor switch contact closes when the steering lock is released. The steering lock release signal is then sent to the main body ECU. Receiving the signal, the ECU permits engine start. (This prevents the engine from being started with the steering locked.)
Scheme 80
Scheme 81
Scheme 82
- INSPECT STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition E39-4 (SLP1) - E39-2 (SGND) Engine switch off Engine switch on (ACC or IG) Below 1 V NG --> See step 3 OK: Go to next step
- CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - MAIN BODY ECU) Disconnect the E39 connector from the steering lock actuator assembly. Disconnect the E50 connector from the main body ECU. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition E39-4 (SLP1) - E50-18 (SLP) Always Below 1 ohms E39-4 (SLP1) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 4
- CHECK SMART KEY SYSTEM (for Smart Function). Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-426069-S16159633322011101200000)
- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-425886-S31999203772011101200000)
This circuit supplies voltage from the battery to terminal B of the steering lock ECU. This circuit is used as power source for the steering lock ECU, motor, communication, and peripheral circuits.
Scheme 83
Scheme 84
- CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - BODY GROUND) Disconnect the E39 connector from the steering lock actuator assembly. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition E39-1 (GND) - Body ground Always Below 1 ohms E39-2 (SGND) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
- CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - BATTERY) Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition E39-7 (B) - Body ground Always 11 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - BATTERY) OK --> See step 3
- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-425886-S31999203772011101200000)