B1271

NETWORKING: MULTIPLEX COMMUNICATION SYSTEM: B1271: Combination Meter ECU Communication Stop
B1271 - Combination Meter ECU Communication Stop

DESCRIPTION

This DTC is detected if communication between the combination meter and gateway ECU stops for more than 10 seconds.





WIRING DIAGRAM





INSPECTION PROCEDURE

HINT
If "+B of GND short malfunction of communication bus" DTCs (B1266 and B1267) are detected at the same time as "communication stop" DTC B1271, repair the "+B or GND short malfunction of communication bus" DTCs first B1266.

PROCEDURE

1. INSPECT FUSE (DOME, MPX-B)

(a) Remove the DOME and MPX-B fuses from the engine room relay block No. 1.

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

Standard Resistance:





NG -- REPLACE FUSE (DOME, MPX-B)
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (COMBINATION METER - BATTERY AND BODY GROUND)

(a) Disconnect the J34 connector.





(b) Measure the voltage and resistance of the wire harness side connector.

Standard Voltage:





Standard Resistance:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (COMBINATION METER - BATTERY AND BODY GROUND)
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (COMMUNICATION LINE)

(a) Disconnect the J34, J49 and J58 connectors.*1





(b) Disconnect the J34, J76 and J58 connectors.*2

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

Standard Resistance:





*1: w/ Occupant Classification System

*2: w/o Occupant Classification System

Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE COMBINATION METER Removal