Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2012 Acura MDXFACTORY OEM SERVICE PROCEDURE
Security Alarm System
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 |
Factory Service Tools
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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.