Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Diagnosis System

Toyota Corolla Cross (2022-2025) Service Manual / Power Source & Network / Networking / Lin Communication System / Diagnosis System

DIAGNOSIS SYSTEM

DESCRIPTION

The main body ECU (multiplex network body ECU) and certification ECU (smart key ECU assembly) control the LIN communication system. LIN communication system data and Diagnostic Trouble Codes (DTCs) can be read through the Data Link Connector 3 (DLC3).

When the system seems to be malfunctioning, use the GTS to check for malfunctions and perform repairs.

CHECK DLC3

(a) Check the DLC3.

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INSPECT AUXILIARY BATTERY VOLTAGE

(a) Measure the auxiliary battery voltage with the ignition switch off.

Standard Voltage:

11 to 14 V

If the voltage is below 11 V, recharge or replace the auxiliary battery.

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     Data List / Active Test

    DATA LIST / ACTIVE TEST DATA LIST NOTICE: In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when decidi

     Diagnostic Trouble Code Chart

    DIAGNOSTIC TROUBLE CODE CHART LIN Communication System DTC No. Detection Item Link B120687 P/W Master SW System Missing Message

     P/W Master SW System Missing Message (B120687,B127387,B232187-B232487)

    DESCRIPTION This DTC is stored when LIN communication between the main body ECU (multiplex network body ECU) and multiplex network master switch assembly, front power window regulator motor assem

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     Removal

    REMOVAL CAUTION / NOTICE / HINT COMPONENTS (REMOVAL) Procedure Part Name Code 1 FUEL SUCTION TUBE WITH PUMP AND GAUGE ASSEMBLY 77020A - - - 2 DRAIN FUEL - - - 3 TAIL EXHAUST PIPE ASSEMBLY 17430

     Voice Recognition Microphone1 Circuit Open (B157913)

    DESCRIPTION The telephone microphone assembly LH is connected to the radio and display receiver assembly via voice recognition microphone 1 signal detection line. This DTC is stored when the radio and display receiver assembly detects disconnection of telephone microphone assembly LH.

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