SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 480 (ENGINE IMMOBILIZER SYSTEM - DIAGNOSTICS)CIRCUIT INSPECTIONDTC B2780: PUSH SWITCH/KEY UNLOCK WARNING SWITCH MALFUNCTIONINSPECTION 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 2004 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

Start the inspection from step 1 when using the hand-held tester and start from step 2 when not using the hand-held tester.

  1. Read value of hand-held tester (transponder key ECU (switch condition)). 

    PREPARATION: 

    1. Connect the hand-held tester to the DLC3.
    2. Turn the ignition switch ON with the key with which the engine does not start.

      CHECK: 

      Select the item "KEY SW" on the hand-held tester.

      OK: 

      MONITOR DISPLAY CONDITION

      Monitor Display Condition
      OFF Key is in ignition key cylinder
      ON No key in ignition key cylinder
    1. NG : Go to step 2. 
    2. OK : Replace transponder key ECU. 
  2. Inspect unlock warning switch (See  INSPECTION  ). 
    1. NG : Replace unlock warning switch. 
    2. OK : Go to next step. 
  3. Check harness and connector between transponder key ECU and unlock warning switch, and unlock warning switch and body ground. (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
    1. NG : Repair or replace harness or connector. 
    2. OK : Replace transponder key ECU. 
RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready ToolsFree Quote CheckQuote Shield Pro

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.