Dtc B2785 Communication Malfunction Between Ecus Connected By Lin

Power Source Network. Land Cruiser. Urj200, 202 Grj200 Vdj200
Networking. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - ID CODE BOX AND STEERING LOCK ECU)

CHECK FOR DTC

CHECK FOR DTC

REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU)

CHECK FOR DTC

REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

CHECK FOR DTC

DTC B2785 Communication Malfunction between ECUs Connected by LIN


DESCRIPTION

The certification ECU (smart key ECU assembly) intermittently monitors the LIN communication bus between the components related to certification. DTC B2785 is output 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 (smart key ECU assembly) detects a malfunction in the LIN communication bus between components related to certification continuously 3 times.
  1. Certification ECU (smart key ECU assembly)
  2. ID code box (immobiliser code ECU)
  3. Steering Lock Actuator Assembly (Steering lock ECU)
  4. Harness or connector

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Networking.Lin Communication System. Dtc B2785 Communication Malfunction Between Ecus Connected By Lin


INSPECTION PROCEDURE

NOTICE:
When using the GTS with the ignition switch off to troubleshoot:
Connect the GTS to the vehicle, and turn a courtesy switch on and off at 1.5 second intervals until communication between the GTS and vehicle begins.
HINT:
When DTC B2785 is output simultaneously, perform the troubleshooting.
1.CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - ID CODE BOX AND STEERING LOCK ECU)

  1. Disconnect the E26 and E124 and E130 ECU connectors.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E130-6 (LIN) - E124-2 (LIN1)
    		Always
    		Below 1 Ω
    E130-6 (LIN) - E26-5 (LIN)
    		Always
    		Below 1 Ω
    E130-6 (LIN) - Body ground
    		Always
    		Below 1 Ω
    E124-2 (LIN1) - Body ground
    		Always
    		10 kΩ or higher
    E26-5 (LIN) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


2.CHECK FOR DTC

  1. Reconnect the E124 ECU connectors.

  1. Clear the DTC (Click here).

  1. Recheck for DTCs.

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


B
Go to step 4
A


3.CHECK FOR DTC

  1. Reconnect the E26 ECU connector.

  1. Disconnect the E124 ECU connector.

  1. Clear the DTC (Click here).

  1. Recheck for DTCs.

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


B
Go to step 6
A

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

4.REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU)

  1. for Manual Tilt and Manual Telescopic Steering Column

    1. Temporarily replace the steering lock ECU with a new or normally functioning one (Click here).

  1. for Power Tilt and Power Telescopic Steering Column

    1. Temporarily replace the steering lock ECU with a new or normally functioning one (Click here).

  1. Clear the DTC (Click here).


NEXT


5.CHECK FOR DTC

  1. Recheck for DTCs.

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


B
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
A

END (STEERING LOCK ECU IS DEFECTIVE)

6.REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

  1. Temporarily replace the ID code box immobiliser code ECU with a new or normally functioning one.

  1. Clear the DTC (Click here).


NEXT


7.CHECK FOR DTC

  1. Recheck for DTCs (Click here).

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


B
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
A

END (ID CODE BOX IS DEFECTIVE)