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Defogger Switch Test: Civic

  1. Check fuse No. 16 (7.5-amp) in underdash fuse/relay box. Replace fuse if necessary. Carefully remove defogger switch from instrument panel. Disconnect defogger switch 5-pin connector. Turn ignition on. Using a DVOM, check voltage reading between defogger switch connector terminals No. 1 (Black/Blue wire) and No. 4 (Black wire). See Figure. If battery voltage exists, go to next step. If battery voltage does not exist, check for open in Black/Blue wire between defogger switch and underdash fuse/relay box.
  2. Connect a jumper wire between defogger switch connector terminals No. 1 (Black/Blue wire) and No. 5 (Blue/Yellow wire). Ensure rear defogger operates properly. If rear defogger operates properly, replace defogger switch.
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