Lane Keeping Assist System (LKAS) Symptom Troubleshooting Index

Symptom	Diagnostic procedure	Also check for
LKAS indicator (on the MID) does not come on	Symptom troubleshooting - Refer to: Adaptive Cruise Control (ACC) Symptom Troubleshooting - Senses a vehicle driving in another lane or Adaptive Cruise Control (ACC) Symptom Troubleshooting - Intermittently senses the vehicle driving ahead or Adaptive Cruise Control (ACC) Symptom Troubleshooting - ACC indicator (on the MID) does not come on or Lane Keeping Assist System (LKAS) Symptom Troubleshooting - LKAS indicator (on the MID) does not come on or Adaptive Cruise Control (ACC) Symptom Troubleshooting - Does not sense the vehicle driving ahead .
LKAS indicator (on the MID) does not go off	NOTE: If any of the CAN communication failure DTCs are indicated in other systems, troubleshoot the DTC first. Check for open wire or shorted wire in the F-CAN circuit; Between the gauge control module and the CAN gateway (IF-CAN_H, IF-CAN_L) Between the millimeter wave radar and the CAN gateway (AF-CAN A_H, AF-CAN A_L) Check the millimeter wave radar power circuit (IG1_IDAS(VST)) Check the millimeter wave radar ground circuit (GND) Do the gauge control module self-diagnostic function .	Refer to the following about the indicator operating condition; How to Troubleshoot Information - Refer to: How to Troubleshoot the Auto High-Beam (High-Beam Support System) or How to Troubleshoot the Road Departure Mitigation or How to Troubleshoot the Lane Keeping Assist System (LKAS) or How to Troubleshoot the Collision Mitigation Braking System (CMBS) or How to Troubleshoot the Adaptive Cruise Control (ACC) Refer to the following about the circuit troubleshooting; Gauge control module connector for inputs and outputs Millimeter wave radar connector for inputs and outputs LKAS circuit diagram - Refer to: Lane Keeping Assist System (LKAS) Circuit Diagram(3.0L Engine) or Adaptive Cruise Control (ACC) Circuit Diagram(2.0L Engine) or Adaptive Cruise Control (ACC) Circuit Diagram(3.0L Engine) or Lane Keeping Assist System (LKAS) Circuit Diagram(2.0L Engine) Fuse to components index Ground to components index

Symptom

Diagnostic procedure

Also check for

LKAS indicator (on the MID) does not come on

Symptom troubleshooting - Refer to: Adaptive Cruise Control (ACC) Symptom Troubleshooting - Senses a vehicle driving in another lane or Adaptive Cruise Control (ACC) Symptom Troubleshooting - Intermittently senses the vehicle driving ahead or Adaptive Cruise Control (ACC) Symptom Troubleshooting - ACC indicator (on the MID) does not come on or Lane Keeping Assist System (LKAS) Symptom Troubleshooting - LKAS indicator (on the MID) does not come on or Adaptive Cruise Control (ACC) Symptom Troubleshooting - Does not sense the vehicle driving ahead .

LKAS indicator (on the MID) does not go off

NOTE: If any of the CAN communication failure DTCs are indicated in other systems, troubleshoot the DTC first.

Check for open wire or shorted wire in the F-CAN circuit;
- Between the gauge control module and the CAN gateway (IF-CAN_H, IF-CAN_L)
- Between the millimeter wave radar and the CAN gateway (AF-CAN A_H, AF-CAN A_L)
Check the millimeter wave radar power circuit (IG1_IDAS(VST))
Check the millimeter wave radar ground circuit (GND)
Do the gauge control module self-diagnostic function .

Refer to the following about the indicator operating condition;

How to Troubleshoot Information - Refer to: How to Troubleshoot the Auto High-Beam (High-Beam Support System) or How to Troubleshoot the Road Departure Mitigation or How to Troubleshoot the Lane Keeping Assist System (LKAS) or How to Troubleshoot the Collision Mitigation Braking System (CMBS) or How to Troubleshoot the Adaptive Cruise Control (ACC)

Refer to the following about the circuit troubleshooting;