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 MANUALSHYUNDAI2011EQUUS SIGNATUREREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTHEADLIGHTSHEAD LAMP - ADAPTIVE FRONT LIGHTING SYSTEM DIAGNOSIS
2011 Hyundai Equus Signature
Head Lamp - Adaptive Front Lighting System Diagnosis
2011 Hyundai Equus SignatureSECTION Head Lamp - Adaptive Front Lighting System Diagnosis
- Diagnostic TROBLE Codes Index
- DTC B1101: Battery Voltage High
- DTC B1102: Battery Voltage Low
- DTC B1220: Vehicle Speed Sensor
- DTC B1301: Steering angle signal fault
- DTC B1302: Gearbox Signal Fault-CAN Signal
- DTC B1303: Accelerator Pedal Position Signal Error
- DTC B1304: Engine state signal fault
- DTC B1305: Yaw Rate Sensor Signal Fault
- DTC B1306: Brake pedal signal fault
- DTC B1307: Air suspension ECU sensor signal invalid
- DTC B1510: AFLS switch/button fault
- DTC B1592: Head lamp Switch Fault
- DTC B1603: CAN Communication Bus Off
- DTC B1621: ECU Hardware Error
- DTC B1622: ECU Software Error
- DTC B1636: LIN Communication Error Fault
- DTC B1637: System Not Initialized
- DTC B1638: CAN time-out Air Suspension
- DTC B1639: LIN communication error DBL left
- DTC B1640: LIN communication error DBL right
- DTC B1641: LIN communication error LWR left
- DTC B1642: LIN communication error LWR right
- DTC B1661: Parameter Fault And Missing
- DTC B1905: Sensor Power Supply Fault
- DTC B1906: Front sensor PWM signal fault
- DTC B1907: Front sensor signal fault
- DTC B1908: Rear sensor PWM signal fault
- DTC B1909: Rear sensor signal fault
- DTC B2325: Swivel module fault left
- DTC B2326: Swivel module fault right
- DTC B2400: Levelling motor fault left
- DTC B2401: Levelling motor fault right
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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.