( TL19E00H10800000000HBAT00 )

ACC 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 ACC indication on the MID | Do the gauge control module self-diagnostic function. |

Vehicle speed cannot be set when the SET switch is pressed (between 30 km/h (19 mph) and 180 km/h (112 mph))

1.
2.
3.
4.

Test the adaptive cruise control (ACC) combination switch.
Test the transmission range switch (A/T).
Test the brake pedal position switch.
Check for a short in the SCS line.

- Blown No. 15 (10 A) or No. 10 (10 A) fuse in the under-hood 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 adaptive cruise control (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:

- R20A3 engine.
- K24Z3 engine.

- 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 adaptive cruise control (ACC) switch is turned off

Test the adaptive cruise control (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 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 adaptive cruise control (ACC) system check.

- Incorrect millimeter wave radar installation
- Wheel alignment

Does not sense the vehicle driving ahead

Do the adaptive cruise control (ACC) system check.

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

Intermittently senses the vehicle driving ahead

Do the adaptive cruise control (ACC) system check.

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

Adaptive cruise control (ACC) indicator (orange) does not come on | Symptom Troubleshooting. |
Adaptive cruise control (ACC) indicator (orange) does not go off | Symptom Troubleshooting. |
Adaptive cruise control (ACC) activation indicator (green) does not come on | Symptom Troubleshooting. |
Adaptive cruise control (ACC) activation indicator (green) does not go off | Symptom Troubleshooting. |
HDS does not communicate with the adaptive cruise control (ACC) unit or the vehicle | Troubleshoot the DLC circuit. |