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 .
Is DTC 3, 4, 27, or 29 indicated?
YES -
Troubleshoot the indicated DTC(s).■
NO -
Go to Step 9 .
  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 .
Is DTC 20 indicated?
YES -
Troubleshoot the EPS control unit DTCs.■
NO -
Go to Step 13 .
Is DTC 26 indicated?
YES -
Troubleshoot the LKAS camera DTCs.■
NO -
Troubleshoot the LKAS control unit DTCs.■
  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).
  1. Measure the voltage between ACC unit 20P connector No. 2 terminal and body ground.
Is there battery voltage?
YES -
NO -
Repair open in the wire between the No. 2 (7.5 A) fuse in the driver's under-dash fuse/relay box and ACC unit.■
  1. Turn the ignition switch to LOCK (0).
  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 21 .
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 control unit.■
  1. Turn the ignition switch to ON (II).
  1. Measure the voltage between body ground and LKAS control unit 26P connector No. 1 terminal individually.
Is there battery voltage?
YES -
Go to Step 23 .
NO -
Repair open in the wire between the No. 1 (7.5 A) fuse in the driver's under-dash fuse/relay box and LKAS control unit.■
  1. Turn the ignition switch to LOCK (0).
  1. Check for continuity between body ground and LKAS control unit 26P connector No. 13 terminal individually.
Are there continuity?
YES -
NO -
Repair open in the wire between LKAS control unit and body ground (G602).■