Civic L4-1.8L (2006)
MICU Control Functions Index
The MICU (built into the under-dash fuse/relay box) is one of the B-CAN components. The MICU controls many systems related to the body controller
area and a security system, and also works as a gateway to diagnose the other B-CAN connected ECUs with the HDS. Refer to each system circuit
diagram for details.
The MICU also controls the function of these circuits:
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Entry lights control (map lights and ceiling light)
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Exterior lights control (including the daytime running lights control)
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Horn
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Interlock system
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Key-in reminder
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Keyless entry
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Lights-on reminder
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Power door locks
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Seat belt reminder
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Security alarm
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Turn signal/hazard flasher
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Wiper/washer
Body Controller Area Network (B-CAN) and Fast Controller Area Network (F-CAN)
The body controller area network (B-CAN) and the fast controller area network (F-CAN) share information between multiple electronic control units
(ECUs). B-CAN communication moves at a slower speed (33.33 kbps) for convenience related items and for other functions. F-CAN information moves
at a faster speed (500 kbps) for "real time" functions such as fuel and emissions data. To allow both systems to share information, the gauge control
module translates information from B-CAN to F-CAN and from F-CAN to B-CAN.
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The single wire method is used between the units not requiring the communication to move at a fast speed.
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Using a single wire method reduces the number of the wires used on the body controller area network.
