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.
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HOMESERVICE MANUALSHONDA2002CIVIC SIREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 112 (DASH LIGHTS BRIGHTNESS CONTROLLER)CONTROL UNIT INPUT TEST
2002 Honda Civic Si
Control Unit Input Test
2002 Honda Civic SiSECTION Control Unit Input Test
WARNING: This page is about a different car, the 2006 Acura MDX, 2005 Acura MDX, 2004 Acura MDX, and 2003 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
If only the gauge lights do not work, check the gauge circuit and unit first ('04-'06 models).
- Before testing the dash lights brightness control functions, troubleshoot the multiplex control system (see TROUBLESHOOTING
).
Driver's Multiplex Control Unit
- Remove the driver's multiplex control unit from the driver's under-dash fuse/relay box.
- Inspect the connector and socket terminals to be sure they are all making good contact.
- If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.
- If the terminals look OK, go to step 4.
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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.