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

Is there battery voltage?

YES | - | Repair a short to power in the wire between the adaptive cruise control (ACC) unit and the adaptive cruise control (ACC) relay, or between the adaptive cruise control (ACC) unit and the brake lights circuits.■
NO | - | Check for loose or poor connections. If OK, replace the adaptive cruise control (ACC) unit. ■

1. Clear the DTCs with the HDS.

1. Turn the main switch ON.

1. Check the brake lights with the brake pedal pressed.

Do the brake lights come on?

YES | - | Go to Step 13 .
NO | - | Go to Step 36 .

1. Check for DTCs with the HDS.

Is DTC 30 indicated?

YES | - | Go to Step 14
NO | - | Go to Step 20 .

1. Turn the ignition switch OFF.

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

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

1. Disconnect the brake pedal position switch 4P connector.