MULTIPLEX COMMUNICATION SYSTEM, Diagnostic DTC:B1297

DTC Code DTC Name
B1297 Clearance Sonar ECU Communication Stop

DESCRIPTION

This DTC is detected if communication between the clearance warning ECU and gateway ECU stops for more than 10 seconds.

DTC No. DTC Detection Condition Trouble Area
B1297 Clearance warning ECU communication stops

  • Clearance warning ECU

  • Wire harness or connector

WIRING DIAGRAM

A015YHAE06

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 B1297, repair the "+B or GND short malfunction of communication bus" DTCs first Click here.

PROCEDURE


  1. INSPECT FUSE (LH-IG)


    1. Remove the LH-IG 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
      LH-IG fuse Always Below 1 Ω

    NG

    REPLACE FUSE

    OK

  2. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU - BATTERY AND BODY GROUND)


    1. A0162K5E04

      Disconnect the Q37 ECU connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      Q37-8 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      Q37-27 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (CLEARANCE WARNING ECU - BATTERY AND BODY GROUND)

    OK

  3. CHECK HARNESS AND CONNECTOR (COMMUNICATION LINE)


    1. A015YIZE02

      Disconnect the Q37, A27 and J34 connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Q37-26 (M+) - A27-6 (MPX2) Always Below 1 Ω
      Q37-26 (M+) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (COMMUNICATION LINE)

    OK

    REPLACE CLEARANCE WARNING ECU Click here