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 MANUALSACURA2015RLXREPAIR AND DIAGNOSIS (SINGLE PAGE)QUICK LOOKUPSDTC INDEX (EXCEPT HYBRID)BODY CONTROL SYSTEM DTCSCLIMATE CONTROL
2015 Acura RLX
Climate Control
2015 Acura RLXSECTION Climate Control
DIAGNOSTIC TROUBLE CODE (DTC) INDENTIFICATION
| DTC | Description | DTC type |
|---|---|---|
| B121A | An open in the mode control motor circuit | Signal error |
| B121B | A short in the mode control motor circuit | Signal error |
| B121D | Humidity/In-car temperature sensor communication error | Loss of communication |
| B1220 | A short in the recirculation control motor circuit | Signal error |
| B1227 | An open in the outside air temperature sensor circuit | Signal error |
| B1228 | A short in the outside air temperature sensor circuit | Signal error |
| B1229 | An open in the sunlight sensor circuit | Signal error |
| B122A | An open in the air quality sensor circuit | Signal error |
| B122B | A short in the air quality sensor circuit | Signal error |
| B122C | Air quality sensor internal error | Signal error |
| B122D | An open in the rear temperature control dial circuit | Signal error |
| B122E | A short in the rear temperature control dial circuit | Signal error |
| B122F | An open in the windshield defrost switch circuit | Signal error |
| B1230 | A short in the sunlight sensor circuit | Signal error |
| B1231 | An open in the evaporator temperature sensor circuit | Signal error |
| B1232 | A short in the evaporator temperature sensor circuit | Signal error |
| B1233 | An open in the air mix control motor circuit (driver's) | Signal error |
| B1234 | A short in the air mix control motor circuit (driver's) | Signal error |
| B1235 | A problem in the air mix control motor circuit, linkage, door, or motor (driver's) | Signal error |
| B1236 | An open in the passenger's air mix control motor circuit | Signal error |
| B1237 | A short in the passenger's air mix control motor circuit | Signal error |
| B1238 | A problem in the passenger's air mix control motor circuit, linkage, door, or motor | Signal error |
| B123A | An open in the passenger's mode control motor circuit | Signal error |
| B123B | A short in the passenger's mode control motor circuit | Signal error |
| B1240 | A problem in the mode control motor circuit, linkage, door, or motor | Signal error |
| B1241 | A problem in the blower motor circuit | Signal error |
| B1243 | A problem in the passenger's mode control motor circuit, linkage, door, or motor | Signal error |
| B1244 | An open in the rear air mix control motor circuit | Signal error |
| B1245 | A short in the rear air mix control motor circuit | Signal error |
| B1246 | A problem in the rear air mix control motor circuit, linkage, door, or motor | Signal error |
| B2979 | An open in the A/C pressure sensor circuit | Signal error |
| B2980 | A short in the A/C pressure sensor circuit | Signal error |
| B2983 | A problem in the recirculation control motor circuit, linkage, door, or motor | Signal error |
| B2986 | An open in the recirculation control motor circuit | Signal error |
| B2988 | A problem in the A/C compressor variable capacity control solenoid circuit | Signal error |
| U1280 | Communication bus line error (BUS-OFF) | Loss of communication |
| U1281 | Lost communication with MICU (climate control unit) | Loss of communication |
| U128D | Lost communication with gauge control module (climate control unit) | Loss of communication |
| U1291 | Lost communication with relay control module (climate control unit) | Loss of communication |
| B1125 | Driver's power window motor A pulse malfunction | Signal error |
| B1126 | Driver's power window motor B pulse malfunction | Signal error |
| B1127 | Driver's door lock key cylinder switch malfunction | Signal error |
| B1128 | Driver's door lock switch malfunction | Signal error |
| B1129 | Driver's door lock knob switch malfunction | Signal error |
| B1130 | Front passenger's power window motor A pulse malfunction | Signal error |
| B1131 | Front passenger's power window motor B pulse malfunction | Signal error |
| B1132 | Left rear power window motor A-phase pulse signal input error | Signal error |
| B1133 | Left rear power window motor B-phase pulse signal input error | Signal error |
| B1134 | Right rear power window motor A-phase pulse signal input error | Signal error |
| B1135 | Right rear power window motor B-phase pulse signal input error | Signal error |
| B1140 | Driver's power window position detect circuit malfunction | Signal error |
| B1142 | Door multiplex control unit lost communication with front passenger's power window switch (UART line open) | Loss of communication |
| B1145 | Front passenger's power window position detect circuit malfunction | Signal error |
| B1147 | Left rear window position data error | Signal error |
| B1149 | Right rear window position data error | Signal error |
| U1280 | B-CAN communication bus line error (BUS-OFF) | Loss of communication |
| U1281 | Door multiplex control unit lost communication with MICU | Loss of communication |
| U128D | Door multiplex control unit lost communication with gauge control module | Loss of communication |
| U1299 | Door multiplex control unit lost communication with climate control unit | Loss of communication |
| B1601 | Keyless access control unit internal (CPU) error | Internal error |
| B1602 | Keyless access control unit internal (EEPROM) error | Internal error |
| B1627 | RF1 unit disconnected (2-way transceiver or RF antenna) | Signal error |
| B1632 | MTR CONT signal error | Signal error |
| B1640 | RF1 antenna not connected or malfunction | Signal error |
| B1641 | RF2 antenna not connected or malfunction | Signal error |
| B1645 | Driver's door LF antenna circuit short | Signal error |
| B1646 | Driver's door LF antenna circuit open | Signal error |
| B1647 | Passenger's door LF antenna circuit Short | Signal error |
| B1648 | Passenger's door LF antenna circuit open | Signal error |
| B1649 | Driver side rear passenger door LF antenna circuit short | Signal error |
| B1650 | Driver side rear passenger door LF antenna circuit open | Signal error |
| B1651 | Passenger side rear passenger door LF antenna circuit short | Signal error |
| B1652 | Passenger side rear passenger door LF antenna circuit open | Signal error |
| B1657 | Rear bumper LF antenna circuit short | Signal error |
| B1658 | Rear bumper LF antenna circuit open | Signal error |
| B1659 | Front interior LF antenna circuit short | Signal error |
| B1660 | Front interior LF antenna circuit open | Signal error |
| B1663 | Rear interior LF antenna circuit short | Signal error |
| B1664 | Rear interior LF antenna circuit open | Signal error |
| B1667 | Rear shelf LF antenna circuit short | Signal error |
| B1668 | Rear shelf LF antenna circuit open | Signal error |
| U0199 | Keyless access control unit - door multiplex control unit communication error | Loss of communication |
| U1280 | B-CAN communication bus line error (BUS-OFF) | Loss of communication |
| U1281 | Keyless access control unit lost communication with MICU | Loss of communication |
| U128D | Keyless access control unit lost communication with gauge control module | Loss of communication |
RENDER: 1.0x
NO RELATED
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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.