Civic L4-1668cc 1.7L SOHC MFI (2003)
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If all the input tests prove OK, the multiplex control unit must be faulty; replace the under-dash fuse/relay box assembly.
'04 model
6. Disconnect the X connector from the under-dash fuse/relay box, and make these input tests at the connector. If this input test proves OK, the
multiplex control unit must be faulty; replace the under-dash fuse/relay box assembly.