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. Check the brake light with the brake pedal pressed.

Are the bulbs OK?

YES | - | Intermittent failure. The system is OK at this time. Check for loose or poor connections.■
NO | - | Go to Step 44 .

1. Do the brake pedal test and adjustment.

1. Test the brake pedal position switch.

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

Do the brake lights come on?

YES | - | Intermittent failure. The system is OK at this time. Check for loose or poor connections.■
NO | - | Repair an open in the BLK wire or poor ground (G701).■