SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSTOYOTA2004CELICA GT, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 454 (HORN SYSTEM)INSPECTION
2004 Toyota Celica GT, Standard

Section 454 (Horn System): Inspection

2004 Toyota Celica GT, StandardSECTION Inspection
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. INSPECT HORN SWITCH 
    1. Disconnect the negative (-) terminal from the battery.
    2. Remove the left and right covers from the steering wheel.
    3. Using a torx socket wrench, loosen the 2 bolts.
    4. Pull up the horn pad and place it on the steering column, as shown.

      HINT:

      Do not disconnect the connector from the horn pad.

      Fig 1: Pulling Up Horn Pad
      G03377181Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Disconnect the connector from the slip ring.
    6. Check that there is no continuity between terminal 6 of the connector and body ground.
    7. Check that there is continuity between terminal 6 of the connector and body ground when the horn contact plate is pressed against the steering spoke assembly.

      If continuity is not as specified, repair or replace the steering wheel or wire harness as necessary.

    8. Install the horn pad in place and using a torx socket wrench, torque the 2 bolts.

      Torque: 6.9 N.m (70 kgf.cm, 61 in.lbf) 

      Fig 2: Checking Continuity Between Terminal 6 Of Connector And Body Ground
      G03377182Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    9. Install the left and right covers.
    10. Connect the negative (-) terminal to the battery.
  2. INSPECT HORN OPERATION 

    Connect the positive (+) lead from the battery to the terminal and negative (-) lead to the horn body and check that the horn blows.

    If operation is not as specified, replace the horn.

    Fig 3: Inspecting Horn Operation
    G03377183Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSPECT HORN RELAY CONTINUITY 
    SPECIFIED CONDITION

    Condition Tester connection Specified condition
    Constant 1 - 2 Continuity
    Apply B+ between terminals 1 and 2. 3 - 5 Continuity

    If continuity is not as specified, replace the relay.

    Fig 4: Inspecting Horn Relay Continuity
    G03377184Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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.