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.
2023 Acura MDX BaseFACTORY OEM SERVICE PROCEDURE
Front Seat Heater Control Unit
| DTC | Description |
|---|---|
| DTC Troubleshooting: B1C55 (Front Seat Heater Control Unit) | Driver's heater thermistor circuit open |
| DTC Troubleshooting: B1C56 (Front Seat Heater Control Unit) | Driver's heater thermistor circuit short |
| DTC Troubleshooting: B1C57 (Front Seat Heater Control Unit) | Passenger's heater thermistor circuit open |
| DTC Troubleshooting: B1C58 (Front Seat Heater Control Unit) | Passenger's heater thermistor circuit short |
| DTC Troubleshooting: B1C60 (Front Seat Heater Control Unit) | Driver's heater current abnormal high |
| DTC | Description |
|---|---|
| DTC Troubleshooting: B1C61 (Front Seat Heater Control Unit) | Driver's heater current abnormal low |
| DTC Troubleshooting: B1C62 (Front Seat Heater Control Unit) | Passenger's heater current abnormal high |
| DTC Troubleshooting: B1C63 (Front Seat Heater Control Unit) | Passenger's heater current abnormal low |
| DTC Troubleshooting: B1C68 (Front Seat Heater Control Unit) | Driver's heater not heating |
| DTC Troubleshooting: B1C69 (Front Seat Heater Control Unit) | Passenger's heater not heating |
| DTC Troubleshooting: B1C70 (Front Seat Heater Control Unit) | Driver's main heater switch failure |
| DTC Troubleshooting: B1C71 (Front Seat Heater Control Unit) | Passenger's main heater switch failure |
| DTC Troubleshooting: U1064 (Front Seat Heater Control Unit) | Seat heater control unit lost communication with climate control unit |
| DTC Troubleshooting: U1280 (Front Seat Heater Control Unit) | Seat heater control unit communication bus line error (BUS-OFF) |
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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