( TL19E00H32500000000HBAT00 )

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 | Do the gauge control module self-diagnostic function. |

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.

Test the ACC combination switch.
Test the transmission range switch.
Test the brake pedal position switch.
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

Test the ACC combination switch.

- An open in the wire
- A short in the wire

Set speed does not cancel when the shift lever is in position N

Test the transmission range switch.

- An open in the wire
- A short in the wire

Set speed does not cancel when the brake pedal is pressed

Test the brake pedal position switch.

- An open in the wire
- A short in the wire

Set speed does not cancel when the main switch is turned off

Test the ACC combination switch.

- An open in the wire
- A short in the wire

Set distance cannot be adjusted with the distance switch

Test the distance/LKAS switch.

- An open in the wire
- A short in the wire

Vehicle speed can be set, but vehicle speed decelerates | Check for DTCs in the PGM-FI system with the HDS. | Faulty ETCS

Senses a vehicle driving in another lane

Do the ACC system check.

- Incorrect millimeter wave radar unit installation
- Wheel alignment

Does not sense the vehicle driving ahead

Do the ACC system check.

- Out of the performance limits
- Wheel alignment
- Undetectable environment

Intermittently senses the vehicle driving ahead

Do the ACC system check.

- Incorrect millimeter wave radar unit installation
- Wheel alignment
- Undetectable environment

LKAS indicator (orange) does not come on | Symptom Troubleshooting |
LKAS indicator (orange) does not go off | Symptom Troubleshooting |
LKAS activation indicator (green) does not come on | Symptom Troubleshooting |
LKAS activation indicator (green) does not go off | Symptom Troubleshooting |