B1262

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

DTC B1262 - A/C ECU Communication Stop

DESCRIPTION

DTC B1262 is output when communication between the A/C amplifier and the multiplex network gateway ECU stops for more than 10 seconds.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - BATTERY)





(a) Disconnect the A9 connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:





HINT: *1: for Automatic A/C
*2: for Manual A/C

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - GROUND)





(a) Measure the resistance according to the value(s) in the table below.
Standard resistance:





HINT: *1: for Automatic A/C
*2: for Manual A/C

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. CHECK COMMUNICATION LINE





(a) Disconnect the C10 and A21 connectors.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





HINT: *1: for Automatic A/C
*2: for Manual A/C

Result:






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