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 Mazda 3 BaseFACTORY OEM SERVICE PROCEDURE

Adaptive Front Lighting System DTCS

ADAPTIVE FRONT LIGHTING SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION

DTC	Refer to
B10A3:86	(See DTC B10A3:86 [ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE] .)
B10A3:87	(See DTC B10A3:87 [ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE] .)
B10A4:86	(See DTC B10A4:86 [ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE] .)
B10A4:87	(See DTC B10A4:87 [ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE] .)
C0061:54	(See DTC C0061:54 [ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE] .)
C0061:96	(See DTC C0061:96 [ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE] .)
U0001:88	(See DTC U0001:88 [ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE] .)
U0122:87	(See DTC U0122:87 [ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE (US)] .)
U0126:87	(See DTC U0126:87 [ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE] .)
U0328:41	(See DTC U0328:41 [ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE] .)
U0328:82	(See DTC U0328:82 [ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE] .)
U0416:29	(See DTC U0416:29 [ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE (US)] .)
U0416:41	(See DTC U0416:41 [ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE (US)] .)
U0416:82	(See DTC U0416:82 [ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE (US)] .)
U0428:86	(See DTC U0428:86 [ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE] .)
U212A:87	(See DTC U212A:87 [ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE] .)
U212B:87	(See DTC U212B:87 [ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE] .)
U212D:87	(See DTC U212D:87 [ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE] .)
U2300:54	(See DTC U2300:54 [ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE] .)
U2300:55	(See DTC U2300:55 [ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE] .)
U2300:56	(See DTC U2300:56 [ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE] .)
U250A:86	(See DTC U250A:86 [ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE] .)
U250D:86	(See DTC U250D:86 [ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE] .)
U3000:42	(See DTC U3000:42 [ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE] .)
U3003:16	(See DTC U3003:16 [ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE (US)] .)
U3003:17	(See DTC U3003:17 [ADAPTIVE FRONT LIGHTING SYSTEM (AFS) CONTROL MODULE (US)] .)

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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