B2782

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

DESCRIPTION

The power source 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 source 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 (smart key ECU assembly) via LIN communication and communicates with other components via CAN communication through the certification ECU (smart key ECU assembly).





* *: Only output while a malfunction is present and the engine switch is on (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 Key / 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.
* When replacing the steering lock actuator assembly (steering lock ECU), registration must be performed Engine Immobilizer System (w/ Smart Key System).
* After performing repairs, perform the DTC output confirmation operation, and then confirm that no DTCs are output again.

HINT

Related Data List and Active Test Items








PROCEDURE

1. INSPECT STEERING LOCK ECU

(a) Disconnect the C18 steering lock ECU connector.

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

Standard Resistance:





(c) Reconnect the C18 steering lock ECU connector.

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

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





Text in Illustration





Measurement Conditions





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 electrical key transmitter 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.
*: for Automatic Transaxle

NG -- CHECK HARNESS AND CONNECTOR (POWER SOURCE CONTROL ECU - STEERING LOCK ECU)
OK -- Continue to next step.

2. CLEAR DTC AND DATA LIST MALFUNCTION RECORD

(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(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.

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 Reading and Clearing Diagnostic Trouble Codes.

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

Smart Key





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 SOURCE CONTROL ECU - STEERING LOCK ECU)

(a) Disconnect the C43 power source control ECU connector.

(b) Disconnect the C18 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 SOURCE CONTROL ECU Removal