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 OFF, then turn it ON (II).
  1. Watch the VSA indicator.
Does the VSA indicator come on?
Go to Step 4 .
NO -
Intermittent failure, the system is OK at this time.■
  1. Check for LKAS control unit DTCs with HDS.
Is DTC 21 indicated?
NO -
Troubleshoot the indicated DTC.■