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Horn Switch Test

  1. Disconnect the dashboard wire harness 20P connector (A) from the cable reel (B).

  1. Using a jumper wire, connect the dashboard wire harness 20P connector No. 1 terminal to body ground. The horns should sound.
    • If the horn sounds, go to Step 4 .
    • If the horn do not sound, check these items:
    • -
      No. 24 (10 A) fuse in the under-dash fuse/relay box.
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      -
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      MICU (without security).
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      An open in the wire.

  1. Reconnect the dashboard wire harness 20P connector (A) to the cable reel (B).
  1. Remove the driver's airbag assembly, and disconnect the horn switch 1P positive terminal (C) from the driver's airbag.

  1. Without steering wheel switch:
    Check for continuity between the dashboard wire harness 20P connector No. 1 terminal and the cable reel subharness 20P connector No. 11 terminal.

  1. Check for continuity between the cable reel subharness 20P connector No. 11 terminal and the horn switch 1P positive terminal.
    • If there is continuity, check the installation of the driver's airbag assembly and the steering wheel. If OK, replace the driver's airbag assembly.
    • If there is no continuity, repair an open in the wire.

  1. With steering wheel switch:
    Check for continuity between the dashboard wire harness 20P connector No. 1 terminal and the steering wheel switch 20P connector No. 11 terminal.

  1. Check for continuity between the steering wheel switch 20P connector No. 11 terminal and the horn switch 1P positive terminal.
    • If there is continuity, check the installation of the driver's airbag assembly and the steering wheel. If OK, replace the driver's airbag assembly.
    • If there is no continuity, repair an open in the wire.