Pinpoint Test F : The Automatic High Beam Feature Is Inoperative: Notes

Normal Operation and Fault Conditions 

The IPMA controls the automatic high beam feature when active. The IPMA requests the high beam headlamps on when the following conditions are met:

• The feature has been enabled using the message center
• The autolamps feature has turned the exterior lamps on
• The vehicle speed is greater than 51 km/h (32 mph)
• The IPMA determines the ambient lighting conditions are dark enough
• The IPMA does not detect any light source that can be interpreted as an illuminated vehicle lamp

The IPMA turns the high beams off if any of the following occur:

• The IPMA detects any light source that can be interpreted as an illuminated vehicle lamp
• The IPMA determines the ambient lighting conditions are not dark enough
• The vehicle speed falls below 44 km/h (27 mph)
• The autolamps are turned off
• The IPMA determines the view is blocked

REFER to: Exterior Lighting - System Operation and Component Description  .

Possible Sources 

• Windshield debris
• IPMA (part of the interior rear view mirror)