B1262

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

DTC B1262 - A/C ECU Communication Stop

DESCRIPTION
- This DTC is detected when communication between the A/C control (A/C ECU) and gateway ECU stops for more than 10 seconds.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (A/C ECU - BATTERY AND BODY GROUND)
(a) Disconnect the D37 ECU connector.




(b) Measure the voltage according to the value(s) in the table below.
Voltage:





(c) Measure the resistance according to the value(s) in the table below.
Resistance:






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

2. CHECK RESISTANCE OF COMMUNICATION LINE
(a) Disconnect the D37, E23, and D44*1 or D13*2 ECU connectors.




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





HINT:
*1: w/ Smart key system
*2: w/o Smart key system

Result:





C -- REPAIR OR REPLACE HARNESS OR CONNECTOR
B -- REPLACE A/C ECU AND REPAIR OR REPLACE HARNESS OR CONNECTOR
A -- REPLACE A/C ECU