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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 702 (THEFT DETERRENT SYSTEM - DIAGNOSTICS)HORN CIRCUITINSPECTION 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 Camry Solara. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK HORN ASSY 
    1. Press the horn switch and check if the horns sound.
      1. If the horns sound, proceed to A.
      2. If the horns do not sound, proceed to B.
    1. B : Go to step 2 
    2. A : REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSY 
  2. CHECK WIRE HARNESS (ENGINE ROOM R/B - BATTERY) 
    1. Disconnect the 1A J/B connector.
    2. Measure the voltage of the wire harness side connector.
      Fig 1: Measuring Voltage Of Wire Harness Side Connector
      G03050123Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      CONNECTOR SPECIFIED CONDITION

      Tester Connection Specified Condition
      1A-2 - Body ground 10 to 14 V
    1. NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 
    2. OK : Go to Next Step. 
  3. CHECK HORN ASSY 
    1. Connect terminals 3 and 5 of the HORN relay on the engine room J/B side and check if the horns sound normally.
      1. If the high and low pitched horns sound, proceed to A.
      2. If only the low pitched horn sounds, proceed to B.
      3. If only the high pitched horn sounds, proceed to C.
      4. If the high and low pitched horns do not sound, proceed to D.
    1. B : REPLACE HORN ASSY (HIGH PITCHED) 
    2. C : REPLACE HORN ASSY (LOW PITCHED) 
    3. D : Go to step   7 
    4. A : Go to Next Step. 
  4. INSPECT FUSE (HORN) 
    1. Remove the HORN fuse from the engine room J/B.
    2. Measure the resistance of the fuse.

      Standard: Below 1 Ω 

    1. NG : REPLACE FUSE 
    2. OK : Go to Next Step. 
  5. INSPECT RELAY (HORN) 
    1. Remove the HORN relay from the engine room J/B.
    2. Measure the resistance of the relay.
      Fig 2: Measuring Resistance Of Horn Relay
      G03050124Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      CONNECTOR SPECIFIED CONDITION

      Tester Connection Specified Condition
      3 - 5 10 kΩ or higher
      3 - 5 Below 1 Ω (when battery voltage is applied to terminals 1 and 2)
    1. NG : REPLACE RELAY 
    2. OK : Go to Next Step. 
  6. CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSY 
    1. Disconnect the 2D J/B connector.
    2. Measure the voltage of the wire harness side connector.
      Fig 3: Measuring Voltage Of Wire Harness Side Connector
      G03050125Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      CONNECTOR SPECIFIED CONDITION

      Tester Connection Specified Condition
      2D-11 (HORN) - Body ground 10 to 14 V
    1. NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 
    2. OK : REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSY 
  7. CHECK HORN ASSY 
    1. Disconnect the H8 and H9 connectors.
    2. Measure the voltage of the wire harness side connectors.
      Fig 4: Measuring Voltage Of Horn Assy
      G03050126Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      CONNECTOR SPECIFIED CONDITION

      Tester Connection Specified Condition
      H8-1 - Body ground 10 to 14 V
      H9-1 - Body ground 10 to 14 V
    1. NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 
    2. OK : REPLACE HORN ASSY 
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.