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.
Driver's Control Unit Input Test
Remove driver's multiplex control unit from underdash fuse/relay block. Inspect connector terminals for damage or corrosion. Repair or replace as necessary. Using a DVOM, perform driver's control unit input test at driver's underdash fuse/relay block socket. See Fig 1 or Fig 2 . On Accord, if all input tests are okay, go to PASSENGER'S CONTROL UNIT INPUT TEST . On Prelude, if all input tests are okay, replace driver's multiplex control unit.
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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.
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