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On-Vehicle Inspection

  1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL 
    CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat belt pretensioner activation.
  2. INSPECT FUSE (HORN) 
    1. Measure the resistance of the fuse.

      Standard resistance: Below 1 Ω 

      If the result is not as specified, replace the fuse.

  3. INSPECT INTEGRATION RELAY (HORN RELAY) 
    1. Using a screwdriver, detach the 2 claws and disconnect the integration relay from the engine room No. 1 junction block.

      HINT:

      Tape the screwdriver tip before use.

    2. Disconnect the 3 connectors from the integration relay.
    3. Measure the resistance of the HORN relay.

      Standard voltage 

      TERMINALS RESISTANCE SPECIFICATION

      Tester Connection Specified Condition
      3J-8 - 3K-1 10 kΩ or higher
      3J-8 - 3K-1 Below 1 Ω (when battery voltage is applied to terminals 3J-7 and 3K-1)

      If the result is not as specified, replace the integration relay.

    4. Connect the 3 connectors to the integration relay.
    5. Install the integration relay to the engine room No. 1 junction block.
      Fig 1: Inspecting Integration Relay
      G04476699Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. CONNECT CABLE TO NEGATIVE BATTERY TERMINAL 
  5. PERFORM INITIALIZATION 
    1. Perform initialization (see INITIALIZATION ).
      CAUTION: Certain system need to be initialized after disconnecting and reconnecting the cable from the negative (-) battery terminal.
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