B2782

STEERING COLUMN: STEERING LOCK SYSTEM: B2782: Power Source Control ECU Malfunction
B2782 - Power Source Control ECU Malfunction

DESCRIPTION

The power management control ECU has a power source mode switching function.

This DTC is stored when the IGE input (the steering lock motor activation permission signal) sent directly from the power management control ECU to the steering lock ECU is determined to be abnormal.

HINT
The steering lock ECU is not connected to the CAN communication system. However, the steering lock ECU is connected to the certification ECU via LIN communication and communicates with other components via CAN communication through the certification ECU.





* *: Only output while a malfunction is present and the engine switch on is (IG).

Vehicle Condition and Fail-safe Function when Malfunction Detected





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
* When using the Techstream with the engine 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 Access / Trouble Codes.
* 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.
* When disconnecting the cable from the negative (-) battery terminal, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.
* After performing repairs, perform the DTC output confirmation operation, and then confirm that no DTCs are output again.
* When replacing the steering lock actuator assembly (steering lock ECU), registration must be performed Engine Immobilizer System.
HINT

Related Data List and Active Test Items








PROCEDURE

1. INSPECT STEERING LOCK ECU (IGE VOLTAGE)

(a) Disconnect the G23 steering lock ECU connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





(c) Reconnect the G23 steering lock ECU connector.

(d) Turn the engine switch off, make sure that the steering is unlocked and move the shift lever to P.

(e) Check the signal waveform according to the condition(s) in the table below.





Text in Illustration





Standard Frequency





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 engine switch on (ACC) or on (IG) while the shift lever is in P.
* To lock the steering, turn the engine switch off with the shift lever in P, and then open a door.
NG -- CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - STEERING LOCK ECU)
OK -- Continue to next step.

2. CLEAR DTC AND DATA LIST MALFUNCTION RECORD

(a) Clear the DTCs Steering Lock System.

(b) Disconnect the cable from the negative (-) battery terminal, wait for 30 seconds or more, and then reconnect the cable to the negative (-) battery terminal to clear the record of malfunctions stored in Power Supply Open in the Data List.

NOTICE:
* W/ Navigation System:
* After the engine switch is turned off, the display and navigation module display (navigation system) records various types of memory and settings. As a result, after turning the engine switch off, be sure to wait for the time specified in the following table before disconnecting the cable from the negative (-) battery terminal.

Waiting Time before Disconnecting Cable from Negative (-) Battery Terminal:





* When disconnecting the cable, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.
NEXT -- Continue to next step.

3. READ VALUE USING TECHSTREAM (POWER SUPPLY OPEN)

(a) Perform the DTC output confirmation operation.

(b) Check if DTC B2782 is output Steering Lock System.

(c) Use the Data List to check if the steering lock control is functioning properly.

Smart Access





Result





B -- REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) Disassembly

A -- SYSTEM RETURNED TO NORMAL (DTC STORED DUE TO BAD CONNECTION, BUT SYSTEM RETURNED TO NORMAL BY RECONNECTING CONNECTOR)

4. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - STEERING LOCK ECU)

(a) Disconnect the G39 power management control ECU connector.

(b) Disconnect the G23 steering lock ECU connector.

(c) Check for deformation and corrosion of the connector case and terminals.

OK:

There is no deformation or corrosion of the connector case or terminals.

(d) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE POWER MANAGEMENT CONTROL ECU Removal