Forward Collision Alert and Forward Automatic Braking Operational Checks

If the forward collision alert system is off, inoperative, or not functioning, check the following:

• Verify there are no active driver information center messages and that no DTCs are set.
• Verify that the system is enabled through vehicle personalization. Vehicle personalization allows the system to be set to "Off," "Beeps," "Alert," "Safety Alert Seat," or "Alert & Brake".
• Attempt to replicate the customer concern. While driving, if the vehicle-ahead telltale display illuminates green when following a vehicle above 8 km/h (5 mph), forward collision alert is operating properly.

If the driver is receiving false forward collision alerts, check the following:

• Verify the B174W Front View Camera - Windshield is not blocked by dirt, snow, or ice, and the windshield is not damaged.
• The system may be identifying vehicles farther ahead than the customer is expecting. Forward collision alert detects vehicles within a distance of approximately 60 m (197 ft) and operates at speeds above 8 km/h (5 mph).
• Forward collision alert may provide unnecessary alerts to turning vehicles, vehicles in other lanes, objects that are not vehicles, or shadows. These alerts are normal operation and the vehicle does not need service.

If forward collision alert beeps, but the seat does not vibrate, check the following:

• Verify the vehicle is equipped with safety alert seat (RPO HS1).
• Verify there are no active driver information center messages and that no DTCs are set.
• Verify that the system is enabled through vehicle personalization: It may be set to "Beeps" or "Alert Only" instead of "Safety Alert Seat" or "Alert & Brake".

If FORWARD COLLISION SYSTEM REDUCED or AUTOMATIC COLLISION PRE REDUCED is displayed on the driver information center, check the following:

• Verify that the system is enabled through vehicle personalization: It may be set to "Alert Only" instead of "Off" or Alert & Brake".

If SERVICE FRONT CAMERA is displayed on the driver information center, check the following:

• Verify there are no active driver information center messages and that no DTCs are set.
• If the message is only displayed upon startup, check the following:
  • Verify the B174W Front View Camera - Windshield is not blocked by dirt, snow, or ice, and the windshield is not damaged.
  • Verify the vehicle is not parked closed to a wall or the B174W Front View Camera - Windshield is not in an over-temperature condition, such as sitting for long periods in high ambient temperatures and direct sun.
• If the message is displayed beyond startup, check the following:
  • Verify there are no active driver information center messages and that no DTCs are set.

If FRONT CAMERA IS BLOCKED is displayed on the driver information center, check the following:

• Check for any other driver information center service messages.
• Verify the B174W Front View Camera - Windshield is not blocked by dirt, snow, or ice, and the windshield is not damaged.

If SERVICE DRIVER ASSIST is displayed on the driver information center, check the following:

• Check for any other driver information center service messages.
• Verify there are no active driver information center messages and that no DTCs are set.