Dtc B1249 Double Locking Ecu Communication Stop


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CLEAR DTC

CHECK FOR DTC

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - DOUBLE LOCK DOOR CONTROL RELAY)

CHECK HARNESS AND CONNECTOR (DOUBLE LOCK DOOR CONTROL RELAY - BATTERY AND BODY GROUND)

REPLACE DOUBLE LOCK DOOR CONTROL RELAY ASSEMBLY

CLEAR DTC

CHECK FOR DTC

DTC B1249 Double Locking ECU Communication Stop


DESCRIPTION

DTC B1249 is stored when communication between the double lock door control relay assembly and main body ECU (multiplex network body ECU) stops for more than 10 seconds.

DTC Code
DTC Detection Condition
Trouble Area
B1249
Communication between the double lock door control relay assembly and main body ECU (multiplex network body ECU) stops for more than 10 seconds.
  1. Double lock door control relay assembly
  2. Main body ECU (multiplex network body ECU)
  3. Harness or connector

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Networking.Lin Communication System. Dtc B1249 Double Locking Ecu Communication Stop


INSPECTION PROCEDURE

NOTICE:
  1. When using the intelligent tester with the ignition switch off to troubleshoot:
    Connect the intelligent tester to the vehicle and turn a courtesy light switch on and off at 1.5 second intervals until communication between the intelligent tester and vehicle begins.
  2. Inspect the fuses and bulbs for circuits related to this system before performing the following inspection procedure.
HINT:
When communication between the double lock door control relay and main body ECU (multiplex network body ECU) stops, DTC B2325 is also stored.
1.CLEAR DTC

  1. Clear the DTCs (LandCruiser RM000002S8D045X.html).


NEXT


2.CHECK FOR DTC

  1. Check for DTCs (LandCruiser RM000002S8D045X.html).

    OK:
    DTC B1249 is not output.


NG
Go to step 3
OK

USE SIMULATION METHOD TO CHECK (LandCruiser RM000003YMJ00XX.html)

3.CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - DOUBLE LOCK DOOR CONTROL RELAY)

  1. Remove the main body ECU (multiplex network body ECU) from the driver side junction block assembly (LandCruiser RM000003WBO05FX.html).

  1. Disconnect the G49 double lock door control relay assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A-16 (LIN2) - G49-9 (MPX1)
    		Always
    		Below 1 Ω
    A-16 (LIN2) or G49-9 (MPX1) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK HARNESS AND CONNECTOR (DOUBLE LOCK DOOR CONTROL RELAY - BATTERY AND BODY GROUND)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Networking.Lin Communication System. Dtc B1249 Double Locking Ecu Communication Stop

  1. Disconnect the G49 double lock door control relay assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    G49-14 (GND) - 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
    G49-1 (+B) - Body ground
    		Always
    		11 to 14 V
    G49-7 (CPUB) - Body ground
    		Always
    		11 to 14 V
Text in Illustration
*a
Front view of wire harness connector
(to Double Lock Door Control Relay Assembly)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.REPLACE DOUBLE LOCK DOOR CONTROL RELAY ASSEMBLY

  1. Temporarily replace the double lock door control relay assembly with a new or normally functioning one (LandCruiser RM000003CM800GX.html).


NEXT


6.CLEAR DTC

  1. Clear the DTCs (LandCruiser RM000002S8D045X.html).


NEXT


7.CHECK FOR DTC

  1. Check for DTCs (LandCruiser RM000002S8D045X.html).

    OK:
    DTC B1249 is not output.


NG
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (LandCruiser RM000003WBO05FX.html)
OK

END (DOUBLE LOCK DOOR CONTROL RELAY IS DEFECTIVE)