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On-Vehicle Inspection

  1. REMOVE ENGINE ROOM NO. 1 RELAY BLOCK COVER 
  2. INSPECT INTEGRATION RELAY (UNIT A: HORN RELAY) 
    1. Using a screwdriver, detach the 2 claws and disconnect the integration relay from the engine room junction block.

      HINT:

      Tape the screwdriver tip before use.

      Fig 1: Locating Integration Relay Claws
      G06000512Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

    RESISTANCE SPECIFIED CONDITION

    Tester Connection Specified Condition
    1A-8 - 1C-1 10 kΩ or higher
    1A-8 - 1A-5
    1A-8 - 1C-1 Below 1 Ω (when battery voltage is applied to terminals 1A-7 and 1A-6)
    1A-8 - 1A-5

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

    Fig 2: Identifying Integration Relay Connector
    G06000513Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSTALL ENGINE ROOM NO. 1 RELAY BLOCK COVER