Dtc B1247 Tire Pressure Monitor Receiver Communication Stop

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

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK WIRE HARNESS (TIRE PRESSURE WARNING ECU - BATTERY AND BODY GROUND)

CHECK WIRE HARNESS (TIRE PRESSURE WARNING ECU - BODY GROUND)

CHECK WIRE HARNESS (TIRE PRESSURE WARNING ECU - COMBINATION METER)

CHECK WIRE HARNESS (TIRE PRESSURE WARNING ECU - GATEWAY ECU)

DTC B1247 Tire Pressure Monitor Receiver Communication Stop


DESCRIPTION

This DTC is detected when the communication between the tire pressure warning ECU and gateway ECU stops for more than 10 seconds.

DTC No.
DTC Detection Condition
Trouble Area
B1247
Tire pressure warning ECU receiver communication stops
  1. Tire pressure warning ECU
  2. Wire harness

WIRING DIAGRAM


Lexus Gs430, Gs300. Uzs190 Grs190.Multiplex Communication.Multiplex Communication System. Dtc B1247 Tire Pressure Monitor Receiver Communication Stop


INSPECTION PROCEDURE

1.CHECK WIRE HARNESS (TIRE PRESSURE WARNING ECU - BATTERY AND BODY GROUND)
Lexus Gs430, Gs300. Uzs190 Grs190.Multiplex Communication.Multiplex Communication System. Dtc B1247 Tire Pressure Monitor Receiver Communication Stop

  1. Disconnect the L45 ECU connector.

  1. Turn the engine switch on (IG).

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

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    L45-1 (IG) - Body ground
    		Engine switch on (IG)
    		10 to 14 V


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


2.CHECK WIRE HARNESS (TIRE PRESSURE WARNING ECU - BODY GROUND)
Lexus Gs430, Gs300. Uzs190 Grs190.Multiplex Communication.Multiplex Communication System. Dtc B1247 Tire Pressure Monitor Receiver Communication Stop

  1. Disconnect the L45 ECU connector.

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    L45-7 (GND) - Body ground
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


3.CHECK WIRE HARNESS (TIRE PRESSURE WARNING ECU - COMBINATION METER)

Lexus Gs430, Gs300. Uzs190 Grs190.Multiplex Communication.Multiplex Communication System. Dtc B1247 Tire Pressure Monitor Receiver Communication Stop

  1. Disconnect the L45 ECU connector.

  1. Disconnect the L31 combination meter connector.

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    L45-6 (MPX1) - L31-5 (MPX-)
    		Below 1 Ω
    L45-7 (GND)- Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


4.CHECK WIRE HARNESS (TIRE PRESSURE WARNING ECU - GATEWAY ECU)

Lexus Gs430, Gs300. Uzs190 Grs190.Multiplex Communication.Multiplex Communication System. Dtc B1247 Tire Pressure Monitor Receiver Communication Stop

  1. Disconnect the L45 ECU connector.

  1. Disconnect the L66 gateway ECU connector.

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    L45-12 (MPX2) - L66-4 (MPI1)
    		Below 1 Ω
    L45-12 (MPX2 )- Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

REPLACE TIRE PRESSURE WARNING ECU