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 U1281 (BSI Radar Unit)
DTC U1281 : Left Side BSI Radar Unit Lost Communication With MICU
DTC U1281 : Right Side BSI Radar Unit Lost Communication With MICU
NOTE: Before you troubleshoot, review the general troubleshooting information .
| DTC Description | DTC |
|---|---|
| U1281 Left side BSI radar unit lost communication with MICU | |
| U1281 Right side BSI radar unit lost communication with MICU |
DTC (BSI)
- Problem verification
-1. Turn the vehicle to the ON mode.
-2. Clear the DTC with the HDS.
Clear DTC
-3. Turn the vehicle to the OFF (LOCK) mode.
-4. Turn the vehicle to the ON mode, then wait for at least 2 seconds.
-5. Check for DTCs with the HDS.
DTC Description DTC U1281 Left side BSI radar unit lost communication with MICU U1281 Right side BSI radar unit lost communication with MICU Is DTC U1281 indicated?
YES
Go to the multiplex integrated control system general troubleshooting . If the symptom is still present, replace the appropriate BSI radar unit .
NO
Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting .
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.