B1296

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

DESCRIPTION

This DTC is detected when communication between the front controller and gateway ECU stops for more than 10 seconds.





WIRING DIAGRAM





INSPECTION PROCEDURE

HINT
When "+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.

PROCEDURE

1. INSPECT FUSE (MPX-B)

(a) Remove the MPX-B fuse from the engine room J/B No. 1.

(b) Measure the resistance of the fuse.

Standard resistance:

Below 1 Ohms

NG -- REPLACE FUSE
OK -- Continue to next step.

2. CHECK WIRE HARNESS (FRONT CONTROLLER - BATTERY AND BODY GROUND)

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





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

Standard voltage:





Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. CHECK RESISTANCE OF COMMUNICATION LINE

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





(b) Measure the resistance between the specified terminals on the wire harness side connectors.

Standard resistance:





Result:





B -- REPAIR OR REPLACE HARNESS OR CONNECTOR AND REPLACE FRONT CONTROLLER

C -- REPAIR OR REPLACE HARNESS OR CONNECTOR

A -- REPLACE FRONT CONTROLLER