B1262

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

DESCRIPTION

* This DTC is stored if communication between the air conditioning amplifier assembly 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 B1266 or B1267 (+B or GND short malfunction of communication bus) is stored at the same time as DTC B1262, perform troubleshooting for DTC B1266 or B1267 first.

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING 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:





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 J76 connector.

(b) Disconnect the J34 connector.





(c) 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 AIR CONDITIONING AMPLIFIER ASSEMBLY

(a) Replace the air conditioning amplifier assembly Removal.

NEXT -- Continue to next step.

4. CHECK DTC OUTPUT

(a) Clear the DTC Multiplex Communication System.

(b) Recheck for DTCs.

OK:

DTC B1262 is not output.

NG -- REPLACE GATEWAY ECU Removal

OK -- END (AIR CONDITIONING AMPLIFIER ASSEMBLY WAS DEFECTIVE)