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 amplifier and network gateway ECU stops for more than 10 seconds.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK OPERATION (A/C SWITCH)
(a) Check that the A/C switch can operate the A/C normally.
OK:
A/C switch can operate the A/C normally.
OK -- REPLACE A/C AMPLIFIER ASSEMBLY
NG -- Continue to next step.
2. CHECK WIRE HARNESS (A/C AMPLIFIER - BATTERY AND BODY GROUND)




(a) Disconnect the A10 amplifier connector.
(b) Measure the voltage and resistance of the wire harness side connector.
Standard voltage:






Standard resistance:






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




(a) Disconnect the A9 and A10 amplifier connectors.
(b) Disconnect the P6 ECU connector.
(c) Disconnect the T9 receiver connector.
(d) Measure the resistance of the wire harness side connectors.
Standard resistance:






Result





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