1. Check for continuity between the adaptive cruise control (ACC) unit 20P connector No. 1 terminal and adaptive cruise control (ACC) relay 5P connector No. 1 terminal.

Is there continuity?

YES | - | Check for loose or poor connections. If OK, replace the adaptive cruise control (ACC) unit. ■
NO | - | Repair an open in the wire between the adaptive cruise control (ACC) unit and the adaptive cruise control (ACC) relay.■

1. Test the adaptive cruise control (ACC) relay.

Is the relay OK?

YES | - | Go to Step 21 .
NO | - | Replace the relay and recheck.■

1. Remove the adaptive cruise control (ACC) relay.