B1273

NETWORKING: MULTIPLEX COMMUNICATION SYSTEM: B1273: Sliding Roof ECU Communication Stop
B1273 - Sliding Roof ECU Communication Stop

DESCRIPTION

This DTC is detected if communication between the sliding roof control 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 (B1214 and B1215) are detected at the same time as "communication stop" DTC B1273, repair the "+B or GND short malfunction of communication bus" DTCs first B1214.

PROCEDURE

1. INSPECT FUSE (S/ROOF)

(a) Remove the S/ROOF 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 (S/ROOF)
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (SLIDING ROOF CONTROL ECU - BATTERY AND BODY GROUND)

(a) Disconnect the R6 connector.





(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 (SLIDING ROOF CONTROL ECU - BATTERY AND BODY GROUND)
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (COMMUNICATION LINE)

(a) Disconnect the R6 and R5 connectors.





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

Standard Resistance:





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

4. CHECK HARNESS AND CONNECTOR (COMMUNICATION LINE)

(a) Disconnect the R5, J55 and 2F 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 SLIDING ROOF CONTROL ECU Disassembly