Dtc B1273 Sliding Roof Ecu Communication Stop

Communication System. Camry. Acv40 Gsv40
Multiplex Communication. Camry. Acv40 Gsv40

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CLEAR DTC

CHECK DTC OUTPUT

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

CHECK HARNESS AND CONNECTOR (SLIDING ROOF ECU - BATTERY AND GROUND)

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

CHECK DTC OUTPUT

DTC B1273 Sliding Roof ECU Communication Stop


DESCRIPTION

This DTC is output when LIN communication between the sliding roof ECU (sliding roof drive gear sub-assembly) and main body ECU (instrument panel junction block) stops for more than 10 seconds.

DTC No.
DTC Detection Condition
Trouble Area
B1273
No communication between sliding roof ECU (Sliding roof drive gear sub-assembly) and main body ECU (Instrument panel junction block) for more than 10 seconds
  1. Sliding roof ECU (Sliding roof drive gear sub-assembly)
  2. Main body ECU (Instrument panel junction block)
  3. Wire harness or connector

WIRING DIAGRAM


Camry. Acv40 Gsv40.Multiplex Communication.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 the courtesy switch on and off at 1.5-second intervals until communication between the tester and vehicle begins.
1.CLEAR DTC

  1. Clear the DTC (CAMRY_ACV40 RM000002XHS00KX.html).


NEXT


2.CHECK DTC OUTPUT

  1. Recheck for DTC (CAMRY_ACV40 RM000002XHS00KX.html).

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


B
USE SIMULATION METHOD TO CHECK (CAMRY_ACV40 RM000000UZ1013X.html)
A


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


  1. Disconnect the E8 and Q12 connectors.


    Camry. Acv40 Gsv40.Multiplex Communication.Lin Communication System. Dtc B1273 Sliding Roof Ecu Communication Stop

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E8-10 (LIN2) - Q12-4 (MPX1)
    		Always
    		Below 1 Ω
    E8-10 (LIN2) - Body ground
    		Always
    		10 kΩ or higher

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

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    E8-10 (LIN2) - Body ground
    		Always
    		Below 1 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK HARNESS AND CONNECTOR (SLIDING ROOF ECU - BATTERY AND GROUND)


    Camry. Acv40 Gsv40.Multiplex Communication.Lin Communication System. Dtc B1273 Sliding Roof Ecu Communication Stop

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    Q12-2 (E) - Body ground
    		Always
    		Below 1 Ω

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

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    Q12-1 (B) - Body ground
    		Always
    		11 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


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

  1. Replace the sliding roof ECU (Sliding roof drive gear sub-assembly) (CAMRY_ACV40 RM000001F2C017X.html).


NEXT


6.CHECK DTC OUTPUT

  1. Clear the DTC (CAMRY_ACV40 RM000002XHS00KX.html).

  1. Recheck for DTC.

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


B
REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)
A

END (SLIDING ROOF ECU IS DEFECTIVE)