Adaptive Cruise Control (ACC) Unit DTC 30: Adaptive Cruise Control (ACC) Relay Circuit Malfunction

1. Check the brake lights without pressing the brake pedal.

Are the brake lights off?

YES | - | Go to Step 10 .
NO | - | Go to Step 2 .

1. Do the brake pedal test and adjustment.

1. Check the brake lights without pressing the brake pedal.

Are the brake lights off?

YES | - | Intermittent failure. The system is OK at this time. Check for loose or poor connections.■
NO | - | Go to Step 4 .

1. Test the brake pedal position switch.

Is the brake pedal position switch OK?

YES | - | Go to Step 5 .
NO | - | Adjust or replace the brake pedal position switch and recheck. ■

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

Is the relay OK?

YES | - | Go to Step 6 .
NO | - | Replace the relay and recheck.■

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

1. Check for voltage between the brake pedal position switch 4P connector No. 2 terminal and body ground.

Is there battery voltage?

YES | - | Repair a short to power in the wire.■
NO | - | Go to Step 8 .

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