Electric Steering Lock - Power Source Circuit
This circuit supplies power source voltage from the battery to terminal B of the steering lock ECU. This is used as power source for the CPU, motor, communication, and peripheral circuits.
Electric Steering Lock - Unlock Position Sensor Signal Circuit
The unlock position sensor is one of the components comprising 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 power source control ECU. Receiving the signal, the ECU permits engine start. (This prevents the engine from being started with the steering locked.)
Electric Steering Lock - Steering Lock Motor Drive Power Circuit
The steering lock ECU is connected to the power source control ECU and certification ECU. The steering lock ECU cannot activate the motor unless it receives permission signals from both the ECUs. (The power source control ECU permits the steering lock ECU to supply power to activate the motor.)
Dtc B2782 Power Source Control Ecu Malfunction
The power source control ECU controls the power supply to activate the steering lock motor. This prevents the steering from being locked while the vehicle is moving.
Dtc B2788 Ig2 Signal Malfunction
The steering lock ECU receives power from the IG2 relay. When the voltage value indicated by the IG signal from the certification ECU equals to the voltage that is applied to the steering lock ECU, the steering will be unlocked. The steering lock ECU will not lock the steering when power from the IG2 relay is present (this prevents the steering from being locked while the vehicle is moving).
Dtc B2781 Open / Short In Steering Lock Ecu
If the steering lock ECU determines that there is a malfunction inside the ECU, it outputs this DTC. Diagnostic communication between the steering lock ECU and the intelligent tester is performed via the certification ECU as the steering lock ECU is not connected to the BEAN.
Electric Steering Lock - Diagnostic Trouble Code Chart
If a trouble code is displayed during the DTC check, check the parts listed for that code in the table below and proceed to the appropriate page.
Electric Steering Lock - Data List / Active Test
Connect the intelligent tester to the DLC3.
Electric Steering Lock - Dtc Check / Clear
Prepare the intelligent tester.
Electric Steering Lock - Diagnosis System
DIAGNOSTIC SYSTEM
When troubleshooting a vehicle with a diagnostic system, the only difference from the usual troubleshooting procedure is connecting the intelligent tester to the vehicle and reading various data output from the vehicle's steering lock ECU.
The steering lock ECU records DTCs when the computer detects a malfunction in the computer itself or in its circuits.