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Section 585 (Horn System): Inspection

WARNING: This page is about a different car, the 2003 Toyota Sequoia. 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.
      Fig 1: Pulling Up Horn Pad
      G02852327Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE: Do not disconnect the connector from the horn pad.
    5. Disconnect the connector from the slip ring.
    6. Check that no continuity exists between terminal 6 of the connector and body ground.
    7. Check that continuity exists between terminal 6 of the connector and body ground when the horn contact plate is pressed against the steering spoke assembly.
      Fig 2: Checking Continuity Exists Between Terminal Of Connector & Body Ground
      G02852328Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      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: 7.1 N.m (72 kgf.cm, 62 in.lbf) 

    9. Install the left and right covers.
    10. Connect the negative (-) terminal to the battery.
  2. INSPECT HORN OPERATION 
    Fig 3: Inspecting Horn Operation
    G02852329Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    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.

  3. INSPECT HORN SWITCH CIRCUIT (See  HORN CIRCUIT  ) 
  4. INSPECT HORN RELAY CONTINUITY 
    SPECIFIED CONDITION

    Condition Tester Connection Specified Condition
    Always 1- 2 Continuity
    Always 3-5 No Continuity
    Apply B+ Between Terminals 1 And 2. 3-5 Continuity

    If continuity is not as specified, replace the relay.

  5. INSPECT HORN RELAY CIRCUIT (See  ELECTRICAL COMPONENT LOCATOR  ) 
    Fig 4: Identifying Horn Relay Terminals
    G02852330Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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