B1296

NETWORKING: MULTIPLEX COMMUNICATION SYSTEM: B1296: Front Light ECU Communication Stop
B1296 - Front Light ECU Communication Stop

DESCRIPTION

This DTC is detected if communication between the front controller (engine room relay block No. 2) and gateway ECU stops for more than 10 seconds.





WIRING DIAGRAM





INSPECTION PROCEDURE

HINT
If "+B of GND short malfunction of communication bus" DTCs (B1214 and B1215) are detected at the same time as "communication stop" DTC B1296, repair the "+B or GND short malfunction of communication bus" DTCs first B1214.

PROCEDURE

1. INSPECT FUSE (MPX-B)

(a) Remove the MPX-B fuse 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 (MPX-B)
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (FRONT CONTROLLER (ENGINE ROOM RELAY BLOCK NO. 2)) - BATTERY AND BODY GROUND)

(a) Disconnect the 2E and 2F connectors.





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

Standard Voltage:





Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (FRONT CONTROLLER (ENGINE ROOM RELAY BLOCK NO. 2)) - BATTERY AND BODY GROUND)
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (COMMUNICATION LINE)

(a) Disconnect the 2F, A30 and J55 connectors.





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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE FRONT CONTROLLER (ENGINE ROOM RELAY BLOCK NO. 2)