Acura B1957: Rear MICU Lost Communication with Combination Switch Control Unit (HLSW Message)
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Acura B1957: Rear MICU Lost Communication with Combination Switch Control Unit (HLSW Message)
OVERVIEWWhat Does The Acura B1957 Code Mean?
This code indicates poor communication between the rear MICU and the Combination Switch Control Unit.
What Are The Potential Causes Of The Acura B1957 Code?
Below are some possible causes of this DTC:
- Loose or poor connections between the rear MICU and the Combination Switch Control Unit.
- Blown fuse in the main under-hood fuse box
- Blown fuse in the under-dash fuse/relay box
- “Open” or “Short” Condition between the rear MICU and the Combination Switch Control Unit
- Faulty Combination Switch Control Unit
- Faulty Rear MICU, replace the rear fuse/relay box
How Serious Is This Acura B1957 Code?
Check possible solutions below:
- If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A.
- If DTCs B1007, B1062, B1063, B1155, B1156, B1957, B1958, and/or B2969 are indicated, perform the Combination Switch Control Unit input test.
- If no codes are present, perform the rear MICU input test.
Recommended Parts
Below are some recommended auto parts to help you address the trouble code affecting your vehicle and get it running smoothly again:
Note: During the purchasing process, please check carefully whether the part you want to buy fits your car!
Reference Sources
Acura B1957, DTCDECODE.
