B1262

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

DESCRIPTION

* This DTC is detected when communication between the No. 2 A/C control amplifier (A/C ECU) and gateway ECU stops for more than 10 seconds.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK OPERATION

(a) Check that the A/C switch can operate the A/C normally.

OK:

A/C switch can operate A/C normally.

NG -- CHECK WIRE HARNESS (No. 2 AIR CONDITIONING AMPLIFIER ASSEMBLY (A/C ECU) - BATTERY AND BODY GROUND)

OK -- REPLACE No. 2 AIR CONDITIONING AMPLIFIER ASSEMBLY (A/C ECU)

2. CHECK WIRE HARNESS (No. 2 AIR CONDITIONING AMPLIFIER ASSEMBLY (A/C ECU) - BATTERY AND BODY GROUND)





(a) Disconnect the K52 ECU connector.

(b) Measure the resistance and voltage 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 K52 ECU connector.

(b) Disconnect the K12 panel connector.

(c) Disconnect the K44 sensor connector.

(d) Measure the resistance of the wire harness side connectors.

Standard resistance:





Result:





C -- REPAIR OR REPLACE HARNESS AND CONNECTOR

B -- REPLACE No. 2 AIR CONDITIONING AMPLIFIER ASSEMBLY AND WIRE HARNESS CONNECTOR

A -- REPLACE No. 2 AIR CONDITIONING AMPLIFIER ASSEMBLY (A/C ECU)