DTC Troubleshooting: 21

LKAS Control Unit DTC 21: VSA Modulator-control Unit Malfunction Clear the DTCs with the HDS. Turn the ignition switch OFF, then turn it ON (II). Watch the VSA indicator. Does the VSA indicator come on?
YES | - | Go to Step 4 .
NO | - | Intermittent failure, the system is OK at this time.■
Check for LKAS control unit DTCs with HDS. Is DTC 21 indicated?
YES | - | Do the troubleshooting for the VSA modulator-control unit. ■
NO | - | Troubleshoot the indicated DTC.■