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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 447 (MULTIPLEX COMMUNICATION SYSTEM - DIAGNOSTICS)CIRCUIT INSPECTIONDTC B1262/62: A/C AMPLIFIER COMMUNICATION STOPINSPECTION 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 2002 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check wire harness  .

    PREPARATION:  Disconnect connector "G1" of gateway ECU, "A7" of A/C amplifier and "C11" of combination meter ECU.

    Fig 1: Testing Wire Harness Gateway ECU To A/C Amplifier & A/C Amplifier To Combination Meter For Continuity
    G01113014Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    CHECK

    1. Check continuity between terminals MPD1 of gateway ECU and MP2+ of A/C amplifier.
    2. Check continuity between terminals MPX+ of A/C amplifier and MPX- of combination meter ECU.

    OK:  There is a continuity in wire harness of both ( a and ( b or if continuity in either ( a or ( b, repair circuit without continuity and retest to confirm.

    NOTE: If there is OPEN in wire harness of either ( a or ( b, please repair it.
    1. NG:  Repair or replace wire harness.
    2. OK:  Replace the A/C amplifier.
RENDER: 1.0x

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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.