DTC Troubleshooting: 21
LKAS Control Unit DTC 21:
 VSA Modulator-control Unit Malfunction
  1. Clear the DTCs with the HDS.
  1. Turn the ignition switch to LOCK (0), then turn it to ON (II).
  1. Check for LKAS control unit DTCs with HDS.
Is DTC 21 indicated?
YES -
Do the troubleshoot for the VSA modulator-control unit with HDS. ■
NO -
Intermittent failure, the system is OK at this time.■