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.
DTC B1106: Door Multiplex Control Unit Lost Communication with MICU (MICU Message)
- Clear the DTCs with the HDS.
- Turn the ignition switch to LOCK (0), and then back to ON (II).
- Wait for 6 seconds or more.
- Check for DTCs with the HDS.
Is DTC B1106 indicated?
YES - Go to step 5.
NO - Intermittent failure. The system is OK at this time. Check for loose or poor and connections.
- Check for DTCs with the HDS.
Are DTCs B1055, B1157, B1255, B1355, B1556, B1806, B1955, B2005, and B2055 also indicated?
YES - Go to the MICU input test (see MICU INPUT TEST ).
NO - Go to the door multiplex control unit input test (see DOOR MULTIPLEX CONTROL UNIT INPUT TEST ).
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.