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 [MULTIPLEX NETWORK BODY ECU] - SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY)

CHECK HARNESS AND CONNECTOR (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY BATTERY AND BODY GROUND

REPLACE SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY (SLIDING ROOF ECU)

CHECK FOR DTC

CHECK HARNESS AND CONNECTOR (COWL SIDE JUNCTION BLOCK LH - SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY)

DTC B1273 Sliding Roof ECU Communication Stop


DESCRIPTION

This DTC is stored when LIN communication between the sliding roof ECU and main body ECU (multiplex network body ECU) 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 (multiplex network body ECU) for 10 seconds or more.
  1. Sliding roof driver gear sub-assembly (Sliding roof ECU)
  2. Main body ECU (multiplex network body ECU)
  3. Cowl side junction block LH
  4. 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:
  1. 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.
  2. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
HINT:
DTC B2325 is stored when the communication between the sliding roof ECU and main body ECU (multiplex network body ECU) 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 [MULTIPLEX NETWORK BODY ECU] - SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY)

  1. Disconnect the A main body ECU connector.

  1. Disconnect the R18 sliding roof ECU connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A-16 (LIN2) - R18-11 (MPX1)
    		Always
    		Below 1 Ω
    A-16 (LIN2) or R18-11 (MPX1) - Body ground
    		Always
    		10 kΩ or higher


NG
Go to step 7
OK


4.CHECK HARNESS AND CONNECTOR (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY BATTERY AND BODY GROUND


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

  1. Disconnect the R18 sliding roof ECU connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    R18-12 (E) - Body ground
    		Always
    		Below 1 Ω
    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    R18-8 (B) - Body ground
    		Always
    		11 to 14 V
    R18-1 (IG) - Body ground
    		Ignition switch ON
    		11 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.REPLACE SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY (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 (for LHD)
    		B
    DTC B1273 is output (for RHD)
    		C


B
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (Click here)

C
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (Click here)
A

END (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY [SLIDING ROOF ECU]) IS DEFECTIVE

7.CHECK HARNESS AND CONNECTOR (COWL SIDE JUNCTION BLOCK LH - SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY)

  1. Disconnect the 2J cowl side junction block LH connector.

  1. Disconnect the R18 sliding roof ECU connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    2J-13 - R18-11 (MPX1)
    		Always
    		Below 1 Ω
    2J-13 or R18-11 (MPX1) - Body ground
    		Always
    		10 kΩ or higher
    Result
    Result
    		Proceed to
    OK (for LHD)
    		A
    OK (for RHD)
    		B
    NG
    		C


B
REPLACE COWL SIDE JUNCTION BLOCK LH (Click here)

C
REPAIR OR REPLACE HARNESS OR CONNECTOR
A

REPLACE COWL SIDE JUNCTION BLOCK LH (Click here)