What causes B1275 on a Honda?

Faulty headlight switch Open or short in the headlight switch harness Poor electrical connection in the headlight switch circuit Faulty multiplex integrated control unit (MICU) Faulty combination switch control unit

How do I fix B1275 on a Honda?

Confirm the code and check the MICU for related faults Inspect the switch connector for corrosion, moisture, and loose pins Test the switch contacts and the signal at the MICU through each position Check the wiring for an open or short before replacing the switch Replace the headlight switch if it fails testing Clear the code and retest

B1275 The MICU saw a fault in the headlight switch OFF position circuit

Q: What does B1275 mean on a Honda?

B1275. The MICU saw a fault in the headlight switch OFF position circuit. The lights may not turn off or the switch position may read wrong. Applies to Honda and Acura models that use this code.

Category: Body
Severity: Body Warning Light
Applies to: Honda and Acura models that use this code

What does B1275 mean on a Honda?

B1275. The MICU saw a fault in the headlight switch OFF position circuit. The lights may not turn off or the switch position may read wrong. This Honda-enhanced code applies to Honda and Acura models that use this code.

Common causes of B1275

Faulty headlight switch
Open or short in the headlight switch harness
Poor electrical connection in the headlight switch circuit
Faulty multiplex integrated control unit (MICU)
Faulty combination switch control unit

How to fix B1275

Confirm the code and check the MICU for related faults
Inspect the switch connector for corrosion, moisture, and loose pins
Test the switch contacts and the signal at the MICU through each position
Check the wiring for an open or short before replacing the switch
Replace the headlight switch if it fails testing
Clear the code and retest

Sources and review

Last updated 2026-10-10.