Acura DTC

Acura DTC B2970


Acura DTC




Climate Control Unit Lost Communication with Relay Control Module (RM message)


Poor communication between the Relay Control Module and the Climate Control Unit. NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in the B-CAN system diagnosis test mode A. If any of the following DTCs are indicated; B1005, B1959, B2162 or B1158, perform the relay control module input test. If no additional codes are present, perform the climate control unit troubleshooting.


  • Loose wire or poor connection on the climate control unit connector A (40P)Poor ground (G302)Blown fuse in the main under-hood fuse boxBlown fuse in the under-dash fuse relay boxOpen circuit between the climate control unit and body groundOpen circuit between the MICU and the climate control unitFaulty Climate Control UnitFaulty Gauge Control Module

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