MULTIPLEX COMMUNICATION SYSTEM, Diagnostic DTC:B1262

DTC Code DTC Name
B1262 A/C ECU Communication Stop

DESCRIPTION


DTC No. DTC Detection Condition Trouble Area
B1262 A/C amplifier (A/C ECU) communication stops

  • A/C amplifier (A/C ECU)

  • Wire harness or connector

WIRING DIAGRAM

A015ZLQE03

INSPECTION PROCEDURE

Tech Tips

If "+B of GND short malfunction of communication bus" DTCs (B1266 and B1267) are detected at the same time as "communication stop" DTC B1262, repair the "+B or GND short malfunction of communication bus" DTCs first Click here.

PROCEDURE


  1. CHECK FUSE (A/C)


    1. Remove the A/C fuse from the main body ECU LH (cowl side junction block LH).

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A/C fuse Always Below 1 Ω

    NG

    REPLACE FUSE

    OK

  2. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - BATTERY AND BODY GROUND)


    1. A0163FEE05

      Disconnect the J58 ECU connector.

    2. Measure the voltage and resistance according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      J58-1 (B) - Body ground Always 11 to 14 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      J58-20 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (A/C AMPLIFIER - BATTERY AND BODY GROUND)

    OK

  3. CHECK HARNESS AND CONNECTOR (COMMUNICATION LINE)


    1. A0161J9E04

      Disconnect the J58, A27 and J76 connectors.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      J58-31 (MPX-) - A27-5 (MPX1) Always Below 1 Ω
      J58-30 (MPX+) - J76-13 (MPI2) Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (COMMUNICATION LINE)

    OK

    REPLACE A/C AMPLIFIER Click here