Dtc B1273 Sliding Roof Ecu Communication Stop

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

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CLEAR DTC

CHECK FOR DTC

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - SLIDING ROOF ECU)

CHECK SLIDING ROOF ECU (BATTERY VOLTAGE AND BODY GROUND)

REPLACE SLIDING ROOF ECU

CHECK FOR DTC

DTC B1273 Sliding Roof ECU Communication Stop


DESCRIPTION

This DTC is stored when LIN communication between the sliding roof ECU and main body ECU (cowl side junction block LH) stops for 10 seconds or more.

DTC Code
DTC Detection Condition
Trouble Area
B1273
No communication between the sliding roof ECU and main body ECU (cowl side junction block LH) for 10 seconds or more.
  1. Sliding roof ECU
  2. Main body ECU (cowl side junction block LH)
  3. Harness or connector

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Networking.Lin Communication System. Dtc B1273 Sliding Roof Ecu Communication Stop


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 switch on and off at 1.5 second intervals until communication between the intelligent tester and vehicle begins.
HINT:
DTC B2325 is stored when the communication between the sliding roof ECU and main body ECU (cowl side junction block LH) stops.
1.CLEAR DTC

  1. Clear the DTC (Click here).


NEXT


2.CHECK FOR DTC

  1. Recheck for DTCs (Click here).

    Result
    Result
    		Proceed to
    DTC B1273 is output
    		A
    DTC B1273 is not output
    		B


B
USE SIMULATION METHOD TO CHECK (Click here)
A


3.CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - SLIDING ROOF ECU)
Land Cruiser. Urj200, 202 Grj200 Vdj200.Networking.Lin Communication System. Dtc B1273 Sliding Roof Ecu Communication Stop

  1. Disconnect the E3 and R5 ECU connectors.

  1. Measure the resistance and voltage according to the value(s) in the tables below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E3-10 (LIN2) - R5-4 (MPX1)
    		Always
    		Below 1 Ω
    E3-10 (LIN2) or R5-4 (MPX1) - Body ground
    		Always
    		10 kΩ or higher
    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    R5-4 (MPX1) - Body ground
    		Always
    		Below 1 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK SLIDING ROOF ECU (BATTERY VOLTAGE AND BODY GROUND)


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Networking.Lin Communication System. Dtc B1273 Sliding Roof Ecu Communication Stop

  1. Disconnect the R5 ECU connector.

  1. Measure the resistance and voltage according to the value(s) in the tables below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    R5-2 (E) - Body ground
    		Always
    		Below 1 Ω
    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    R5-1 (B) - Body ground
    		Always
    		11 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.REPLACE SLIDING ROOF ECU

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

  1. Clear the DTC (Click here).


NEXT


6.CHECK FOR DTC

  1. Recheck for DTCs (Click here).

    Result
    Result
    		Proceed to
    DTC B1273 is not output
    		A
    DTC B1273 is output
    		B


B
REPLACE MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH)
A

END (SLIDING ROOF ECU IS DEFECTIVE)