B1297

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

DESCRIPTION

This DTC is detected if communication between the clearance warning ECU 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 B1297, repair the "+B or GND short malfunction of communication bus" DTCs first B1266.

PROCEDURE

1. INSPECT FUSE (LH-IG)

(a) Remove the LH-IG fuse from the main body ECU LH (cowl side junction block LH).

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

Standard Resistance:





NG -- REPLACE FUSE (LH-IG)
OK -- Continue to next step.

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

(a) Disconnect the Q37 connector.





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

Standard Voltage:





Standard Resistance:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (CLEARANCE WARNING ECU - BATTERY AND BODY GROUND)
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (COMMUNICATION LINE)

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





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

Standard Resistance:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE CLEARANCE WARNING ECU Removal