DTC    B1287    Back Door ECU Communication Stop

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DESCRIPTION

  1. This DTC is detected when communication between the multiplex back door ECU and multiplex network gateway ECU stops for more than 10 seconds.

DTC No.
DTC Detection Condition
Trouble Area
B1287
Multiplex back door ECU Communication stops
  1. Multiplex back door ECU
  2. Wire harness

WIRING DIAGRAM


B110985E02


INSPECTION PROCEDURE

When "+B of GND short malfunction of communication bus" DTCs (B1214 and B1215) are detected at the same time as "communication stop" DTC B1287, repair the "+B or GND short malfunction of communication bus" DTCs first.
1.CHECK OPERATION

  1. Check if the back door closer function operates normally through the power back door closer switch.

    HINT:
    With this inspection, the multiplex back door ECU CPU can be diagnosed if it works normally or not.

    OK:
    Power back door closer function operates normally.



OK
Go to step 4
NG


2.INSPECT FUSE (PBO)

  1. Remove the PBO fuse from the instrument panel junction block.

  1. Measure the resistance of the fuse.

    Standard resistance:
    Below 1 Ω



NG
REPLACE FUSE
OK


3.CHECK WIRE HARNESS (MULTIPLEX BACK DOOR ECU - BATTERY AND BODY GROUND)


    B111060E02

  1. Disconnect the P11 ECU connector.

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

    Standard voltage:
    Tester Connection
    		Specified Condition
    P11-2 (B) - Body ground
    		10 to 14 V

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    P11-8 (GND) - Body ground
    		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK RESISTANCE OF COMMUNICATION LINE

  1. Disconnect the P10, P19 and T4 ECU connectors (w/ Driving position memory).



  1. Disconnect the P10, P19 and G1 ECU connectors (w/o Driving position memory).


    B111061E02

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

    Standard resistance:

    Tester Connection
    		Specified Condition
    P10-22 (MPX1) - P19-7 (MPX1)
    		Below 1 Ω
    P10-22 (MPX1) - T4-5 (MPX1) (*1)
    		Below 1 Ω
    P10-22 (MPX1) - G1-12 (MPD2) (*2)
    		Below 1 Ω

    *1: w/ Driving Position Memory
    *2: w/o Driving Position Memory



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE MULTIPLEX BACK DOOR ECU