Dtc B1249 Double Locking Ecu Communication Stop

Body Electrical. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
Door Lock. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING INTELLIGENT TESTER (COMMUNICATION DOUBLE LOCKING)

CHECK WIRE HARNESS (DOUBLE DOOR LOCK ECU - BODY ECU, BATTERY AND BODY GROUND)

DTC B1249 Double Locking ECU Communication Stop


DESCRIPTION

DTC B1249 is output when the communication between the double door lock ECU and the main body ECU stops for more than 10 seconds.

DTC No.
DTC Detection Condition
Trouble Area
B1249
No communication from double door lock ECU for more than 10 seconds
  1. Aggregation ECU box (Double door lock ECU)
  2. Main body ECU
  3. Wire harness

WIRING DIAGRAM


Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Door Lock.Power Door Lock Control System. Dtc B1249 Double Locking Ecu Communication Stop


INSPECTION PROCEDURE

1.READ VALUE USING INTELLIGENT TESTER (COMMUNICATION DOUBLE LOCKING)

  1. Check the Data List to ensure the proper operation of the double door lock ECU.

    Main body ECU
    Item
    		Measurement Item / Display (Range)
    		Normal Condition
    		Diagnostic Note
    Communication Double Locking
    		Connection status between double door lock ECU and main body ECU / OK or STOP
    		OK: Connection
    STOP: No connection
    		-
    OK:
    Doors can lock / unlock.


OK
REPLACE INSTRUMENT PANEL JUNCTION BLOCK (MAIN BODY ECU)
NG


2.CHECK WIRE HARNESS (DOUBLE DOOR LOCK ECU - BODY ECU, BATTERY AND BODY GROUND)


    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Door Lock.Power Door Lock Control System. Dtc B1249 Double Locking Ecu Communication Stop

  1. Disconnect the E82 double door lock ECU connector.

  1. Disconnect the E18 main body ECU connector.

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    E82-9 (MPX1) - E18-23 (LIN2)
    		Below 1 Ω
    E82-9 (MPX1) or E18-23 (LIN2) - Body ground
    		10 kΩ or higher
    E82-14 (GND) - Body ground
    		Below 1 Ω

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

    Standard voltage:
    Tester Connection
    		Specified Condition
    E82-1 (+B) - Body ground
    		10 to 14 V


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

REPLACE ECU AGGREGATION BOX (DOUBLE DOOR LOCK ECU)