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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 856 (GATEWAY SYSTEM - DIAGNOSIS)CIRCUIT INSPECTIONDTC B1248: AVC-LAN COMMUNICATION IMPOSSIBLEINSPECTION PROCEDURE
2004 Toyota Matrix XR, FWD, Standard

Inspection Procedure

2004 Toyota Matrix XR, FWD, StandardSECTION Inspection Procedure
WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check "Service check mode" of AVC-LAN diagnosis system. 

    CHECK: 

    Connection of the gateway ECU can be checked by AVC-LAN diagnosis.

    (w/o LEXUS navigation system: "Service check mode" of audio system)(See PRE-CHECK )

    (w/ LEXUS navigation system: "Service check mode" of LEXUS navigation system)(See PRE-CHECK )

    OK: 

    Radio display or Multi display:

    G/W: OK (System is normal)

    G/W: EXCH (Replace gateway ECU)

    others: Troubleshoot for each diagnosis.

    1. EXCH: Replace gateway ECU (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
    2. Other: Troubleshoot for each diagnosis. 
    3. OK : Go to next step. 
  2. Check wire harness. 

    PREPARATION: 

    Pull out the ECU connectors mentioned below.

    DTC DETECTION ITEM

    Wire harness side connector of ECU Terminal
    Gateway ECU - Radio and player GTX+ (G3-9) - TXS+ (R3-3)
    GTX- (G3-20) - TXS- (R3-6)

    CHECK: 

    Check continuity of the wire harness between the connectors.

    OK: 

    Continuity 

    1. NG : Repair or replace wire harness. 
    2. OK : Replace gateway ECU (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.