B1297

MULTIPLEX COMMUNICATION: MULTIPLEX COMMUNICATION SYSTEM: B1297: Clearance Sonar ECU Communication Stop
B1297 - Clearance Sonar ECU Communication Stop

DESCRIPTION

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





WIRING DIAGRAM





INSPECTION PROCEDURE

HINT
When "+B of GND short malfunction of communication bus" DTCs (B1266 and B1267) are detected at the same time as "communication stop" DTC B1297, repair the "+B or GND short malfunction of communication bus" DTCs first.

PROCEDURE

1. INSPECT FUSE (LH-IG)

(a) Remove the LH-IG fuse from the cowl side J/B LH.

(b) Measure the resistance of the fuse.

Standard resistance:

Below 1 Ohms

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

2. CHECK WIRE HARNESS (CLEARANCE WARNING ECU - BATTERY AND BODY GROUND)

(a) Disconnect the Q37 ECU 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
OK -- Continue to next step.

3. CHECK RESISTANCE OF COMMUNICATION LINE

(a) Disconnect the Q37, J58 and J34 ECU connectors.





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

Standard resistance:





Result:





Text in Illustration





B -- REPAIR OR REPLACE HARNESS OR CONNECTOR AND REPLACE CLEARANCE WARNING ECU

C -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE CLEARANCE WARNING ECU