Adaptive Cruise Control (ACC) Unit DTC 30: Adaptive Cruise Control (ACC) Relay Circuit Malfunction Check the brake lights without pressing the brake pedal. Are the brake lights off?
YES | - | Go to Step 10 .
NO | - | Go to Step 2 .
Do the brake pedal test and adjustment. 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 .
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. ■
Test the adaptive cruise control (ACC) relay. Is the relay OK?
YES | - | Go to Step 6 .
NO | - | Replace the relay and recheck.■
Disconnect the 4P connector from the brake pedal position switch. 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 .
Disconnect the adaptive cruise control (ACC) unit 20P connector. |