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 MANUALSHONDA2002CIVIC SIREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 177 (MULTIPLEX INTEGRATED CONTROL SYSTEM)DTC TROUBLESHOOTINGDTC B1957: MICU-REAR JUNCTION BOX LOST COMMUNICATION WITH COMBINATION SWITCH CONTROL UNIT (HEADLIGHT SWITCH MESSAGE)
2002 Honda Civic Si
DTC B1957: MICU-Rear Junction Box Lost Communication with Combination Switch Control Unit (Headlight Switch Message)
2002 Honda Civic SiSECTION DTC B1957: MICU-Rear Junction Box Lost Communication with Combination Switch Control Unit (Headlight Switch Message)
WARNING: This page is about a different car, the 2006 Honda Odyssey and 2005 Honda Odyssey. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A
).
- Clear the DTCs with the HDS.
- Turn the ignition switch OFF, and then back ON (II).
- Wait for 6 seconds or more.
- Check for DTCs with the HDS.
Is DTC B1957 indicated?
- YES - Go to step 5.
- NO - Intermittent failure, the communication line is OK at this time. Check for loose or poor connections.
- Check for DTCs with the HDS.
Are DTCs B1007, B1062, B1155, and B1555 also indicated?
- YES - Go to the combination switch control unit input test (see COMBINATION SWITCH CONTROL UNIT INPUT TEST ).
- NO - Go to the MICU-rear junction box input test (see MICU - REAR JUNCTION BOX INPUT TEST ).
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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.