LKAS Symptom Troubleshooting Index
NOTE: The adaptive cruise control (ACC) system is cancelled when the VSA system is activated.
Symptom
Diagnostic procedure
Also check for
Vehicle speed can be set, but there is no LKAS indication on the MID
Vehicle speed cannot be set when the SET switch is pressed (between 72 km/h (45 mph) and 180 km/h (112 mph))
1.
2.
3.
4.
Check for a short in the SCS line.
  • Blown No. 1 (7.5 A) fuse in the under-dash fuse/relay box
  • An open in the wire
  • A short in the wire
  • The system is in service mode
Vehicle speed does not decelerate or accelerate accordingly when the set/resume switch is pressed
  • An open in the wire
  • A short in the wire
Set speed does not cancel when the shift lever is in position N
  • An open in the wire
  • A short in the wire
Set speed does not cancel when the brake pedal is pressed
  • An open in the wire
  • A short in the wire
Set speed does not cancel when the main switch is turned off
  • An open in the wire
  • A short in the wire
Set distance cannot be adjusted with the distance switch
  • An open in the wire
  • A short in the wire
Vehicle speed can be set, but vehicle speed decelerates
Faulty ETCS
Senses a vehicle driving in another lane
  • Incorrect millimeter wave radar unit installation
  • Wheel alignment
Does not sense the vehicle driving ahead
  • Out of the performance limits
  • Wheel alignment
  • Undetectable environment
Intermittently senses the vehicle driving ahead
  • Incorrect millimeter wave radar unit installation
  • Wheel alignment
  • Undetectable environment
LKAS indicator (orange) does not come on
LKAS indicator (orange) does not go off
LKAS activation indicator (green) does not come on
LKAS activation indicator (green) does not go off