What does it mean?
U1194 is a Network (CAN bus, module communications) fault code. It indicates: Lost Communication With Passenger Side Blind Spot Sensor .
Symptoms
- Blind spot warning indicator in the passenger side mirror not lighting, or staying lit permanently
- A message that the blind spot monitoring system is unavailable
- Rear cross traffic alert not working when reversing out of a parking space
- Both sides of the system disabled even though only one sensor is at fault
- Warning lamps for driver assistance systems on
- The fault appearing after bodywork, a towbar installation or bumper removal
Likely causes
- Rear impact, bumper removal or refitting that damaged or displaced the sensor
- Corroded or water filled connector at the sensor, since it sits low at the rear of the vehicle
- Chafed or broken wiring in the rear quarter panel or bumper harness
- Blown fuse, missing supply voltage or a poor ground at the sensor
- Open or shorted communication line between this sensor and its partner sensor or the master module
- Sensor replaced without being coded and calibrated to the vehicle
- Internal failure of the sensor after water ingress or a heavy knock
How to fix it
- Scan the system and check whether the partner sensor has stored its own codes as well
- Remove the trim or bumper cover and inspect the passenger side sensor for impact damage, correct seating and secure mounting
- Unplug the connector and check for water, corrosion and damaged pins, and dry and repair as required
- Check the fuse and measure supply voltage and ground at the sensor under load
- Test the communication line between the sensor and its partner or master module for opens and shorts
- Inspect the rear harness for chafing and for damage from towbar or accessory wiring
- Replace the sensor last, then complete the coding and calibration procedure and verify the system on a road test