B1272

NETWORKING: MULTIPLEX COMMUNICATION SYSTEM: B1272: Power Seat ECU Communication Stop
B1272 - Power Seat ECU Communication Stop

DESCRIPTION

This DTC is stored if communication between the front power seat switch (position control ECU) (for driver side) and gateway ECU stops for more than 10 seconds.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT
If DTC B1214 or B1215 (+B or GND short malfunction of communication bus) is stored at the same time as DTC B1272, perform troubleshooting for DTC B1214 or B1215 first.

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH - BATTERY AND BODY GROUND)

(a) Disconnect the U6 and U7 connectors.





(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
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (COMMUNICATION LINE)

(a) Disconnect the 2F and J55 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 -- Continue to next step.

3. REPLACE FRONT POWER SEAT SWITCH (POSITION CONTROL ECU)

(a) Replace the front power seat switch (position control ECU) (for driver side) Removal.

NEXT -- Continue to next step.

4. CHECK DTC OUTPUT

(a) Clear the DTC Multiplex Communication System.

(b) Recheck for DTCs.

OK:

DTC B1272 is not output.

NG -- REPLACE GATEWAY ECU Removal

OK -- END (FRONT POWER SEAT SWITCH (POSITION CONTROL ECU) WAS DEFECTIVE)