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.
2021 Honda Pilot EliteFACTORY OEM SERVICE PROCEDURE
Auto High-Beam Control Unit
AUTO HIGH-BEAM CONTROL UNIT DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC | Description | DTC type |
|---|---|---|
| B1A05 | Auto high-beam control unit internal failure | Signal error |
| B1A06 | Auto high-beam camera blocked failure | Signal error |
| U1280 | Auto high-beam control unit communication bus line error (BUS-OFF) | Loss of communication |
| U1281 | Auto high-beam control unit lost communication with MICU | Loss of communication |
| U128D | Auto high-beam control unit lost communication with Gauge control module | Loss of communication |
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.
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