Dtc B2785 Communication Malfunction Between Ecus Connected By Lin


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CLEAR DTC

CHECK FOR DTC

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - POWER MANAGEMENT CONTROL ECU)

CLEAR DTC

CHECK FOR DTC

CLEAR DTC

CHECK FOR DTC

CLEAR DTC

CHECK FOR DTC

DTC B2785 Communication Malfunction between ECUs Connected by LIN


DESCRIPTION

The certification ECU intermittently monitors the LIN communication bus between the components related to certification. DTC B2785 is stored when a malfunction in the LIN communication bus between the components related to certification is detected continuously 3 times.

DTC Code
DTC Detection Condition
Trouble Area
B2785
The certification ECU detects a malfunction in the LIN communication bus between components related to certification continuously 3 times.
  1. Certification ECU
  2. Power management control ECU
  3. ID code box
  4. Steering lock actuator assembly (steering lock ECU)
  5. Harness or connector

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Networking.Lin Communication System. Dtc B2785 Communication Malfunction Between Ecus Connected By Lin


INSPECTION PROCEDURE

NOTICE:
When using the intelligent tester with the ignition switch off to troubleshoot:
Connect the intelligent tester to the vehicle and turn a courtesy light switch on and off at 1.5 second intervals until communication between the intelligent tester and vehicle begins.
HINT:
When DTC B2785 and B2287 are output simultaneously, perform troubleshooting for DTC B2785 first.
1.CLEAR DTC

  1. Clear the DTCs (LandCruiser RM000002S8D045X.html).


NEXT


2.CHECK FOR DTC

  1. Check for DTCs (LandCruiser RM000002S8D045X.html).

    OK:
    DTC B2785 is not output.


NG
Go to step 3
OK

USE SIMULATION METHOD TO CHECK (LandCruiser RM000003YMJ00XX.html)

3.CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - POWER MANAGEMENT CONTROL ECU)

  1. Disconnect the G38 certification ECU connector.

  1. Disconnect the G51 power management control ECU connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    G38-29 (LIN) - G51-24 (LIN2)
    		Always
    		Below 1 Ω
    G38-29 (LIN) or G51-24 (LIN2) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CLEAR DTC

  1. Connect the G38 certification ECU connector.

  1. Disconnect the G51 power management control ECU connector.

  1. Clear the DTCs (LandCruiser RM000002S8D045X.html).


NEXT


5.CHECK FOR DTC

  1. Check for DTCs (LandCruiser RM000002S8D045X.html).

    Result
    Result
    		Proceed to
    DTC B2785 is output
    		A
    DTC B2785 is not output
    		B


B
REPLACE POWER MANAGEMENT CONTROL ECU (LandCruiser RM0000039R5026X.html)
A


6.CLEAR DTC

  1. Connect the G51 power management control ECU connector.

  1. Disconnect the G35 steering lock actuator assembly (steering lock ECU) connector.

  1. Clear the DTCs (LandCruiser RM000002S8D045X.html).


NEXT


7.CHECK FOR DTC

  1. Check for DTCs (LandCruiser RM000002S8D045X.html).

    Result
    Result
    		Proceed to
    DTC B2785 is output
    		A
    DTC B2785 is not output (for Power Tilt and Power Telescopic Steering Column)
    		B
    DTC B2785 is not output (for Manual Tilt and Manual Telescopic Steering Column)
    		C


B
REPLACE STEERING LOCK ACTUATOR ASSEMBLY (LandCruiser RM0000039SJ01KX.html)

C
REPLACE STEERING LOCK ACTUATOR ASSEMBLY (LandCruiser RM0000039SJ01JX.html)
A


8.CLEAR DTC

  1. Connect the G35 steering lock actuator assembly (steering lock ECU) connector.

  1. Disconnect the G37 ID code box connector.

  1. Clear the DTCs (LandCruiser RM000002S8D045X.html).


NEXT


9.CHECK FOR DTC

  1. Check for DTCs (LandCruiser RM000002S8D045X.html).

    Result
    Result
    		Proceed to
    DTC B2785 is output
    		A
    DTC B2785 is not output
    		B


B
REPLACE ID CODE BOX
A

REPLACE CERTIFICATION ECU