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:

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
HINT: *2: w/o Smart key system

Result:

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