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 DIAGNOSISGENERAL INFORMATIONDTC INDEXAIR CONDITIONING SYSTEM DTCS
2011 Hyundai Equus Signature
Air Conditioning System DTCS
2011 Hyundai Equus SignatureSECTION Air Conditioning System DTCS
AIR CONDITIONING SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC | Description |
|---|---|
| DTC B1204 | Air Mix Potentiometer Open (Low) - Passenger |
| DTC B1205 | Air Mix Potentiometer Short (High) - Passenger |
| DTC B1208 | Intake Potentiometer Open (Low) |
| DTC B1209 | Intake Potentiometer Short (High) |
| DTC B1233 | In-Car Temperature Sensor Short (Low) |
| DTC B1234 | In-Car Temperature Sensor Open (High) |
| DTC B1237 | Ambient Temperature Sensor Short (Low) |
| DTC B1238 | Ambient Temperature Sensor Open (High) |
| DTC B1241 | Evaporator Temperature Sensor Short (Low) |
| DTC B1242 | Evaporator Sensor Open (High) |
| DTC B1245 | Air Mix Potentiometer Open (Low) - Driver |
| DTC B1246 | Air Mix Potentiometer Short (High) - Driver |
| DTC B1249 | Direction Potentiometer Open (Low) - Driver |
| DTC B1250 | Direction Potentiometer Short (High) - Driver |
| DTC B1257 | AQS Sensor Open |
| DTC B1258 | AQS Sensor Short |
| DTC B1259 | AQS Sensor Fault |
| DTC B1275 | Air Mix Potentiometer-VENT Open (Low) - Console |
| DTC B1276 | Air Mix Potentiometer VENT Short(High) - Console |
| DTC B1277 | Air Mix Potentiometer-TEMP Open (Low) - Console |
| DTC B1278 | Air Mix Potentiometer-TEMP Short (High) - Console |
| DTC B1279 | Air Mix Potentiometer Open (Low) - Console |
| DTC B1280 | Air Mix Switch Potentiometer Short (High) - Console |
| DTC B1281 | Humidity Sensor Short (Low) - AUTO Defog |
| DTC B1282 | Humidity Sensor Open (High) - AUTO Defog |
| DTC B1283 | Direction Potentiometer Open (Low) - AUTO Defog |
| DTC B1284 | Direction Potentiometer Short (High) - Auto Defog |
| DTC B1285 | Direction Control Motor - AUTO Defog |
| DTC B1672 | APT Sensor Fault-CAN Signal |
| DTC B1685 | Engine RPM fault-CAN Signal |
| DTC B1686 | Vehicle Speed Sensor fault-CAN Signal |
| DTC B1687 | Engine Coolant Temperature Sensor Circuit-CAN Signal |
| DTC B1688 | Cluster lonizer Fault |
| DTC B2406 | Air Mix Motor-Driver |
| DTC B2408 | Intake Motor |
| DTC B2409 | Direction Control Motor - Driver |
| DTC B2415 | Air Mix Door Motor - Passenger |
| DTC B2447 | Air Mix Motor VENT - Console |
| DTC B2448 | Air Mix Motor TEMP - Console |
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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.