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.
2012 Acura RLFACTORY OEM SERVICE PROCEDURE
Climate Control System DTCS
CLIMATE CONTROL SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC | Detection Item or Symptom | ECU | DTC type |
|---|---|---|---|
| B1200 | Communication bus line error (BUS-OFF) | Climate control unit | Loss of communication |
| B1202 | Climate control unit internal error | Climate control unit | Internal error |
| B1205 | Climate control unit lost communication with gauge control module (VSP/NE message) | Climate control unit | Loss of communication |
| B1206 | Climate control unit lost communication with gauge control module (coolant temp message) | Climate control unit | Loss of communication |
| B1207 | Climate control unit lost communication with gauge control module (illumination message) | Climate control unit | Loss of communication |
| B1208 | Climate control unit lost communication with keyless access control unit (FOB_ID frame) | Climate control unit | Loss of communication |
| B1225 | An open in the in-car temperature sensor circuit | Climate control unit | Signal error |
| B1226 | A short in the in-car temperature sensor circuit | Climate control unit | Signal error |
| B1227 | An open in the outside air temperature sensor circuit | Climate control unit | Signal error |
| B1228 | A short in the outside air temperature sensor circuit | Climate control unit | Signal error |
| B1229 | An open in the sunlight sensor circuit | Climate control unit | Signal error |
| B1230 | A short in the sunlight sensor circuit | Climate control unit | Signal error |
| B1231 | An open in the evaporator temperature sensor circuit | Climate control unit | Signal error |
| B1232 | A short in the evaporator temperature sensor circuit | Climate control unit | Signal error |
| B1235 | A problem in the air mix control motor circuit, linkage, door, or motor (driver's) | Climate control unit | Signal error |
| B1238 | A problem in the passenger's air mix control motor circuit, linkage, door, or motor | Climate control unit | Signal error |
| B1240 | A problem in the mode control motor circuit, linkage, door, or motor | Climate control unit | Signal error |
| B1241 | A problem in the blower motor circuit | Climate control unit | Signal error |
| B2975 | An open in the driver's vent air temperature sensor circuit | Climate control unit | Signal error |
| B2976 | A short in the driver's vent air temperature sensor circuit | Climate control unit | Signal error |
| B2977 | An open in the passenger's vent air temperature sensor circuit | Climate control unit | Signal error |
| B2978 | A short in the passenger's vent air temperature sensor circuit | Climate control unit | Signal error |
| B2979 | An open in the A/C pressure sensor circuit | Climate control unit | Signal error |
| B2980 | A short in the A/C pressure sensor circuit | Climate control unit | Signal error |
| B2981 | Climate control unit lost communication with navigation system | Climate control unit | Loss of communication |
| B2982 | Climate control unit lost communication with servo unit | Climate control unit | Loss of communication |
| B2983 | A problem in the recirculation control motor circuit, linkage, door, or motor | Climate control unit | Signal error |
| B2984 | A problem in the driver's cool vent control motor circuit, linkage, door, or motor | Climate control unit | Signal error |
| B2985 | A problem in the passenger's cool vent control motor circuit, linkage, door, or motor | Climate control unit | Signal error |
| B2987 | A problem in the rear vent control motor circuit, linkage, door, or motor | Climate control unit | Signal error |
| B2991 | Climate control unit lost communication with audio system | Climate control unit | Loss of communication |
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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