B1262

NETWORKING: MULTIPLEX COMMUNICATION SYSTEM: B1262: A/C ECU Communication Stop

DTC B1262 - A/C ECU Communication Stop

DESCRIPTION

This DTC is detected if communication between the A/C amplifier 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 B1262, repair the "+B or GND short malfunction of communication bus" DTCs first B1266.

PROCEDURE

1. CHECK FUSE (A/C)
(a) Remove the A/C 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 (A/C)
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - BATTERY AND BODY GROUND)





(a) Disconnect the J58 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 (A/C AMPLIFIER - BATTERY AND BODY GROUND)
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (COMMUNICATION LINE)





(a) Disconnect the J58, A27 and J76 connectors.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:






NG -- REPLACE HARNESS OR CONNECTOR
OK -- REPLACE A/C AMPLIFIER ASSEMBLY