What does it mean?
B2206 is a Body (airbags, seat belts, body electronics) fault code. It indicates: SRS Unit Lost Communication with AcuraLink Control Unit (XM receiver) .
Symptoms
- Vehicle icon drifts off the road or rotates the wrong way on the map
- Position lost in tunnels, underground car parks and areas with poor satellite coverage
- Map turns the wrong way at junctions or the heading arrow points incorrectly
- Position jumps back onto the road only when satellite signal returns
- Error message about the navigation system
- Route guidance gives late or incorrect turn instructions
Likely causes
- Gyroscope element inside the navigation unit failed internally
- Unit refitted at the wrong angle or in the wrong orientation after a repair
- Mounting bracket loose, so the unit vibrates and the sensor cannot settle
- Calibration or learning procedure never carried out after the unit was replaced
- Vehicle speed signal missing or intermittent, which the unit needs alongside the gyro
- Low or unstable supply voltage
- Water damage or a heavy impact to the unit
- Software corruption after an interrupted update
How to fix it
- Confirm the manufacturer definition and the unit location for this vehicle
- Verify the unit is mounted at the correct angle and that all brackets and fixings are tight
- Check the vehicle speed signal reaching the unit, the gyro is only half of the dead reckoning system
- Measure supply voltage and ground quality at the unit connector
- Run the navigation self test or diagnostic routine and read the gyro output while turning the vehicle slowly
- Carry out the calibration or drive learning procedure specified for the unit
- Update the software if a newer level is available
- Replace and calibrate the unit if the gyro output stays implausible, then verify the icon tracks correctly on a road test including a tight turn