WARNING: This page is about a different car, the 2013 Honda Fit, 2012 Honda Fit, 2011 Honda Fit, 2010 Honda Fit, and 2009 Honda Fit. However, it is still accessible from the selected car via links, so may be relevant.

The MICU controls the exterior lights and the horn based on inputs of each switch.

SECURITY ALARM SYSTEM REFERENCE TABLE

-	Input	Output
MICU	IG1 power supply	Head lights (low beam)
	Ignition key switch	Parking lights
	Audio switch	Side marker lights
	Tailgate latch switch	Taillights
	Driver's door switch	Security horn
	Front passenger's door switch
	Left rear door switch
	Right rear door switch
	Driver's door key cylinder switch (LOCK/UNLOCK)
	Driver's door lock knob switch (UNLOCK)
	Front passenger's door lock knob switch (UNLOCK)
	Left rear door lock knob switch (UNLOCK)
	Right rear door lock knob switch (UNLOCK)
	Security hood switch
B-CAN	Keyless door lock signal	MICU (SET1) message
	Door lock signal	MICU (SET2) message
	VALID CODE message	ALARM (ACTION) message

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Security Alarm System

Use the Manual With the Right Hardware

When to See a Mechanic

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