LKAS System Troubleshooting
LKAS System Troubleshooting
NOTE
  • Retrieve DTCs, using the HDS.
  • The LKAS system consists of the LKAS control unit, adaptive cruise control (ACC) unit, a LKAS camera and the EPS control unit. Depending on the trouble that has been occurred, each unit or the camera individually writes in DTCs. Therefore, when a trouble occurs, determine which unit writes these DTCs at first, then starts diagnosing the trouble from the units or the LKAS camera the DTCs are coming from.
  1. Align the front wheels straight ahead.
  1. Turn the ignition switch to LOCK (0).
  1. Connect the HDS to the data link connector (DLC) (A).
  1. Turn the ignition switch to ON (II).
    NOTE: See the HDS Help menu for specific instructions.
  1. Watch the LKAS indicator.
Does the LKAS indicator come on?
YES -
Go to Step 6 .
NO -
Go to Step 8 .
  1. Make sure the HDS communicates with the ACC unit.
Is there communication?
YES -
Go to Step 7 .
NO -
Go to Step 17 .
  1. Make sure the HDS communicates with the LKAS control unit.
Is there communication?
YES -
Go to Step 8 .
NO -
Go to Step 20 .
  1. Check for DTCs in the LKAS control unit DTCs MENU with the HDS.
Is DTC 3, 4, 27, or 29 indicated?
YES -
Troubleshoot the indicated DTC(s).■
NO -
Go to Step 9 .
  1. Clear the LKAS control unit DTCs using the HDS.
  1. Turn the ignition switch to LOCK (0), then turn it to ON (II).
  1. Watch the LKAS indicator.
Does the LKAS indicator come on?
YES -
Go to Step 12 .
NO -
Intermittent failure, the system is OK at this time. Go to Step 14 .
  1. Check for DTCs in the LKAS control unit DTCs MENU with the HDS.
Is DTC 20 indicated?
YES -
Troubleshoot the EPS control unit DTCs.■
NO -
Go to Step 13 .
  1. Check for DTCs in the LKAS control unit DTCs MENU with the HDS.
Is DTC 26 indicated?
YES -
Troubleshoot the LKAS camera DTCs.■
NO -
Troubleshoot the LKAS control unit DTCs.■
  1. Clear the DTC using the HDS, and make sure the DTCs is not left.
  1. Turn the ignition switch to LOCK (0), and disconnect the HDS from the data link connector (DLC).
  1. Check the No. 1 (7.5 A) fuse in the driver's under-dash fuse/relay box.
Is the fuse OK?
YES -
Go to Step 17 .
NO -
Repair short to body ground in the wire between No. 1 (7.5 A) fuse in the driver's under-dash fuse/relay box and LKAS unit.■
  1. Turn the ignition switch to ON (II).