B1277 Center cluster integration panel Communication stops

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	Center cluster integration panel Wire harness

WIRING DIAGRAM

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.

2. 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)

1. Disconnect the C4 panel connector.

2. 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

3. 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.
   

2. 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