Civic Si L4-2.0L (2004)
4. Reconnect the connectors to the under-dash fuse/relay box, turn the ignition switch ON (II) to keep the system awake and make sure these input
tests at the appropriate connectors on the under-dash fuse/relay box.
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If any test indicates a problem, find and correct the cause, then recheck the system.
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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.
