DTC    B1277    Center Cluster Integration Panel ECU Communication Stop

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DESCRIPTION

  1. This DTC is detected when communication between the center cluster integration panel and multiplex network gateway ECU stops for more than 10 seconds.

DTC No.
DTC Detection Condition
Trouble Area
B1277
Center cluster integration panel Communication stops
  1. Center cluster integration panel
  2. Wire harness

WIRING DIAGRAM


B110982E02


INSPECTION PROCEDURE

HINT:
When "+B of GND short malfunction of communication bus" DTCs (B1266 andB1267) are detected at the same time as "communication stop" DTC B1277, repair the "+B or GND short malfunction of communication bus" DTCs first.

1.INSPECT FUSE (GAUGE No.1)

  1. Remove the GAUGE No.1 fuse from the instrument panel junction block.

  1. Measure the resistance of the fuse.

    Standard resistance:
    Below 1 Ω



NG
REPLACE FUSE
OK


2.CHECK WIRE HARNESS (CENTER CLUSTER INTEGRATION PANEL - BATTERY AND BODY GROUND)


    B111032E01

  1. Disconnect the C4 panel connector.

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

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    C4-9 (IG+) - Body ground
    		Ignition switch ON
    		10 to 14 V

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    C4-7 (GND) - Body ground
    		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.CHECK RESISTANCE OF COMMUNICATION LINE


  1. Disconnect the C8 and G1 ECU connectors.


    B111063E01

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


Standard resistance:

Tester Connection
Specified Condition
C4-5 (MPX+) - G1-13 (MPI2)
Below 1 Ω
C4-12 (MPX-) - C8-5 (MPX2)
Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE CENTER CLUSTER INTEGRATION PANEL