1. Check the No. 29 (7.5 A) fuse in the under-dash fuse/relay box.

Is the fuse OK?

YES | - | Go to Step 2 .
NO | - | Check for a short in the wire between the No. 29 (7.5 A) fuse socket and the adaptive cruise control (ACC) unit. If OK, replace the fuse.■

1. Disconnect the 20P connector from the adaptive cruise control (ACC) unit.

1. Turn the ignition switch ON (II).

1. Check for voltage between the adaptive cruise control (ACC) unit 20P connector No. 2 terminal and body ground.

Is there battery voltage?

YES | - | Go to Step 5 .
NO | - | Repair an open in the wire between the No. 29 (7.5 A) fuse in the under-dash fuse/relay box and the adaptive cruise control (ACC) unit. If the wire is OK, replace the under-dash fuse/relay box.■

1. Turn the ignition switch OFF.