Dtc B1273 Sliding Roof Ecu Communication Stop

Communication System. Lexus Gs430, Gs300. Uzs190 Grs190
Multiplex Communication. Lexus Gs430, Gs300. Uzs190 Grs190

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK OPERATION

CHECK WIRE HARNESS (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY (SLIDING ROOF ECU) - BATTERY AND BODY GROUND)

CHECK RESISTANCE OF COMMUNICATION LINE

DTC B1273 Sliding Roof ECU Communication Stop


DESCRIPTION

This DTC is detected when communication between the sliding roof drive gear (sliding roof control ECU) and network gateway ECU stops for more than 10 seconds.

DTC No.
DTC Detection Condition
Trouble Area
B1273
Sliding roof control ECU communication stops
  1. Sliding roof drive gear sub-assembly (sliding roof control ECU)
  2. Wire harness

WIRING DIAGRAM


Lexus Gs430, Gs300. Uzs190 Grs190.Multiplex Communication.Multiplex Communication System. Dtc B1273 Sliding Roof Ecu Communication Stop


INSPECTION PROCEDURE

1.CHECK OPERATION

  1. Check that the tilt or slide switch can operate the sliding roof normally.

    OK:
    Tilt or slide switch can operate sliding roof normally.


NG
Go to step 2
OK

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

2.CHECK WIRE HARNESS (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY (SLIDING ROOF ECU) - BATTERY AND BODY GROUND)
Lexus Gs430, Gs300. Uzs190 Grs190.Multiplex Communication.Multiplex Communication System. Dtc B1273 Sliding Roof Ecu Communication Stop

  1. Disconnect the Y11 gear connector.

  1. Measure the resistance and voltage of the wire harness side connector.

    Standard Resistance:
    Tester Connection
    		Specified Condition
    Y11-7 (E) - Body ground
    		Below 1 Ω
    Standard Voltage:
    Tester Connection
    		Specified Condition
    Y11-5 (B) - Body ground
    		10 to 14 V


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


3.CHECK RESISTANCE OF COMMUNICATION LINE

Lexus Gs430, Gs300. Uzs190 Grs190.Multiplex Communication.Multiplex Communication System. Dtc B1273 Sliding Roof Ecu Communication Stop

  1. Disconnect the Y11 drive gear connector.

  1. Disconnect the Y6 ECU connector.

  1. Measure the resistance and voltage of the wire harness side connector.

    Standard resistance:
    Tester Connection
    		Specified Condition
    Y11-10 (MPX1) - Y6-15 (MPX2)
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

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