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Lexus NX: Open / Short in Steering Lock ECU (B2781)
Lexus NX Service Manual / Steering / Steering Column / Steering Lock System / Open / Short in Steering Lock ECU (B2781)
DESCRIPTION
The steering lock ECU and steering lock motor are built into the steering lock actuator assembly.
The steering lock ECU (steering lock actuator assembly) detects whether the steering lock is in the lock or unlock position by using the lock sensor and unlock sensor of the steering lock motor.
The steering lock ECU (steering lock actuator assembly) 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 (steering lock actuator assembly) is not connected to the CAN communication system. However, the steering lock ECU (steering lock actuator assembly) 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).
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Note |
|---|---|---|---|---|
| B2781 | Open / Short in Steering Lock ECU | One of the following conditions is met (1-trip detection logic*1):
|
| DTC Output Confirmation Operation: No confirmation operation is necessary (monitoring is continuous). |
- *1: Only output while a malfunction is present and the power switch is on (IG).
- *2: When both detection switches turn on, the system is determined to be malfunctioning.
Vehicle Condition and Fail-safe Function when Malfunction Detected | Vehicle Condition when Malfunction Detected | Fail-safe Function when Malfunction Detected |
|---|---|
| The steering cannot be locked or unlocked. For this reason, the hybrid control system cannot be started. | Prohibits the hybrid control system from being started (the hybrid control system does not crank). |
| DTC No. | Data List Item | Active Test Item |
|---|---|---|
| B2781 | Smart Access | - |
CAUTION / NOTICE / HINT
NOTICE:
- When using the Techstream with the power switch off, connect the Techstream to the vehicle and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Access. While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.
-
After performing repairs, confirm that no DTCs are output again.
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-
When replacing the steering lock ECU (steering lock actuator assembly), registration must be performed.
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HINT:
When all the ECUs that are connected via LIN communication cannot communicate with the certification ECU (smart key ECU assembly), DTC B2785 is stored.
PROCEDURE
| 1. | CHECK DTC |
(a) Using the Techstream, check if LIN communication DTC B2785 is output.
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HINT:
If a LIN communication DTC is output, perform troubleshooting for the LIN communication system.
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| Result | Proceed to |
|---|---|
| DTC B2785 is output. | A |
| DTC B2785 is not output (for Manual tilt and manual telescopic steering column). | B |
| DTC B2785 is not output (for Power tilt and power telescopic steering column). | C |
| A | .gif) | GO TO LIN COMMUNICATION SYSTEM (DTC B2785) |
| B | | REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY) |
| C | | REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY) |
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Diagnosis System
DIAGNOSIS SYSTEM DESCRIPTION (a) Blind spot monitor data and Diagnostic Trouble Codes (DTCs) can be read from the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfunctioning, use the Techstream to check for malfunctions and perform repairs. CHECK DLC3 (a) Check the DLC3.
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